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Index: LICENSES/LGPL-3.0-only.txt
===================================================================
--- /dev/null
+++ LICENSES/LGPL-3.0-only.txt
@@ -0,0 +1,163 @@
+GNU LESSER GENERAL PUBLIC LICENSE
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+Installation Information must accompany the Minimal Corresponding Source and
+Corresponding Application Code. If you use option 4d1, you must provide the
+Installation Information in the manner specified by section 6 of the GNU GPL
+for conveying Corresponding Source.)
+
+   5. Combined Libraries.
+
+You may place library facilities that are a work based on the Library side
+by side in a single library together with other library facilities that are
+not Applications and are not covered by this License, and convey such a combined
+library under terms of your choice, if you do both of the following:
+
+a) Accompany the combined library with a copy of the same work based on the
+Library, uncombined with any other library facilities, conveyed under the
+terms of this License.
+
+b) Give prominent notice with the combined library that part of it is a work
+based on the Library, and explaining where to find the accompanying uncombined
+form of the same work.
+
+   6. Revised Versions of the GNU Lesser General Public License.
+
+The Free Software Foundation may publish revised and/or new versions of the
+GNU Lesser General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to address
+new problems or concerns.
+
+Each version is given a distinguishing version number. If the Library as you
+received it specifies that a certain numbered version of the GNU Lesser General
+Public License "or any later version" applies to it, you have the option of
+following the terms and conditions either of that published version or of
+any later version published by the Free Software Foundation. If the Library
+as you received it does not specify a version number of the GNU Lesser General
+Public License, you may choose any version of the GNU Lesser General Public
+License ever published by the Free Software Foundation.
+
+If the Library as you received it specifies that a proxy can decide whether
+future versions of the GNU Lesser General Public License shall apply, that
+proxy's public statement of acceptance of any version is permanent authorization
+for you to choose that version for the Library.
Index: LICENSES/LicenseRef-KDE-Accepted-LGPL.txt
===================================================================
--- /dev/null
+++ LICENSES/LicenseRef-KDE-Accepted-LGPL.txt
@@ -0,0 +1,12 @@
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the license or (at your option) any later version
+that is accepted by the membership of KDE e.V. (or its successor
+approved by the membership of KDE e.V.), which shall act as a
+proxy as defined in Section 6 of version 3 of the license.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
\ No newline at end of file
Index: LICENSES/MIT.txt
===================================================================
--- /dev/null
+++ LICENSES/MIT.txt
@@ -0,0 +1,19 @@
+MIT License Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Index: autotests/ArraySourceTest.cpp
===================================================================
--- autotests/ArraySourceTest.cpp
+++ autotests/ArraySourceTest.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  * 
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- * 
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- * 
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include <QTest>
Index: autotests/qmltest.cpp
===================================================================
--- autotests/qmltest.cpp
+++ autotests/qmltest.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include <QtQuickTest>
Index: autotests/tst_BarChart.qml
===================================================================
--- autotests/tst_BarChart.qml
+++ autotests/tst_BarChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.11
Index: autotests/tst_LineChart.qml
===================================================================
--- autotests/tst_LineChart.qml
+++ autotests/tst_LineChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.11
Index: autotests/tst_PieChart.qml
===================================================================
--- autotests/tst_PieChart.qml
+++ autotests/tst_PieChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.11
Index: controls/ChartsControlsPlugin.h
===================================================================
--- controls/ChartsControlsPlugin.h
+++ controls/ChartsControlsPlugin.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef CHARTSCONTROLSPLUGIN_H
Index: controls/ChartsControlsPlugin.cpp
===================================================================
--- controls/ChartsControlsPlugin.cpp
+++ controls/ChartsControlsPlugin.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ChartsControlsPlugin.h"
Index: controls/Legend.qml
===================================================================
--- controls/Legend.qml
+++ controls/Legend.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: controls/LegendDelegate.qml
===================================================================
--- controls/LegendDelegate.qml
+++ controls/LegendDelegate.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: controls/LineChartControl.qml
===================================================================
--- controls/LineChartControl.qml
+++ controls/LineChartControl.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: controls/PieChartControl.qml
===================================================================
--- controls/PieChartControl.qml
+++ controls/PieChartControl.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: controls/Theme.qml
===================================================================
--- controls/Theme.qml
+++ controls/Theme.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: controls/styles/org.kde.desktop/Theme.qml
===================================================================
--- controls/styles/org.kde.desktop/Theme.qml
+++ controls/styles/org.kde.desktop/Theme.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/BarChart.qml
===================================================================
--- examples/charts/BarChart.qml
+++ examples/charts/BarChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/ContinuousLineChart.qml
===================================================================
--- examples/charts/ContinuousLineChart.qml
+++ examples/charts/ContinuousLineChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/LineChart.qml
===================================================================
--- examples/charts/LineChart.qml
+++ examples/charts/LineChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/PieChart.qml
===================================================================
--- examples/charts/PieChart.qml
+++ examples/charts/PieChart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/RangeEditor.qml
===================================================================
--- examples/charts/RangeEditor.qml
+++ examples/charts/RangeEditor.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/charts/main.cpp
===================================================================
--- examples/charts/main.cpp
+++ examples/charts/main.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include <QApplication>
Index: examples/charts/main.qml
===================================================================
--- examples/charts/main.qml
+++ examples/charts/main.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 import QtQuick 2.9
Index: examples/snippets/barchart.qml
===================================================================
--- examples/snippets/barchart.qml
+++ examples/snippets/barchart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 //! [example]
Index: examples/snippets/linechart.qml
===================================================================
--- examples/snippets/linechart.qml
+++ examples/snippets/linechart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 //! [example]
Index: examples/snippets/minimal.qml
===================================================================
--- examples/snippets/minimal.qml
+++ examples/snippets/minimal.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 //! [example]
Index: examples/snippets/piechart.qml
===================================================================
--- examples/snippets/piechart.qml
+++ examples/snippets/piechart.qml
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 //! [example]
Index: src/BarChart.h
===================================================================
--- src/BarChart.h
+++ src/BarChart.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef BARCHART_H
Index: src/BarChart.cpp
===================================================================
--- src/BarChart.cpp
+++ src/BarChart.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "BarChart.h"
Index: src/Chart.h
===================================================================
--- src/Chart.h
+++ src/Chart.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef CHART_H
Index: src/Chart.cpp
===================================================================
--- src/Chart.cpp
+++ src/Chart.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "Chart.h"
Index: src/ChartsPlugin.h
===================================================================
--- src/ChartsPlugin.h
+++ src/ChartsPlugin.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef CHARTSPLUGIN_H
Index: src/ChartsPlugin.cpp
===================================================================
--- src/ChartsPlugin.cpp
+++ src/ChartsPlugin.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ChartsPlugin.h"
Index: src/LineChart.h
===================================================================
--- src/LineChart.h
+++ src/LineChart.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINECHART_H
Index: src/LineChart.cpp
===================================================================
--- src/LineChart.cpp
+++ src/LineChart.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LineChart.h"
Index: src/PieChart.h
===================================================================
--- src/PieChart.h
+++ src/PieChart.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef PIECHART_H
Index: src/PieChart.cpp
===================================================================
--- src/PieChart.cpp
+++ src/PieChart.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "PieChart.h"
Index: src/RangeGroup.h
===================================================================
--- src/RangeGroup.h
+++ src/RangeGroup.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef RANGEGROUP_H
Index: src/RangeGroup.cpp
===================================================================
--- src/RangeGroup.cpp
+++ src/RangeGroup.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "RangeGroup.h"
Index: src/XYChart.h
===================================================================
--- src/XYChart.h
+++ src/XYChart.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef XYCHART_H
Index: src/XYChart.cpp
===================================================================
--- src/XYChart.cpp
+++ src/XYChart.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "XYChart.h"
Index: src/datasource/ArraySource.h
===================================================================
--- src/datasource/ArraySource.h
+++ src/datasource/ArraySource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef ARRAYSOURCE_H
Index: src/datasource/ArraySource.cpp
===================================================================
--- src/datasource/ArraySource.cpp
+++ src/datasource/ArraySource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ArraySource.h"
Index: src/datasource/ChartAxisSource.h
===================================================================
--- src/datasource/ChartAxisSource.h
+++ src/datasource/ChartAxisSource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef CHARTAXISSOURCE_H
Index: src/datasource/ChartAxisSource.cpp
===================================================================
--- src/datasource/ChartAxisSource.cpp
+++ src/datasource/ChartAxisSource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ChartAxisSource.h"
Index: src/datasource/ChartDataSource.h
===================================================================
--- src/datasource/ChartDataSource.h
+++ src/datasource/ChartDataSource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef DATASOURCE_H
Index: src/datasource/ChartDataSource.cpp
===================================================================
--- src/datasource/ChartDataSource.cpp
+++ src/datasource/ChartDataSource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ChartDataSource.h"
Index: src/datasource/ColorGradientSource.h
===================================================================
--- src/datasource/ColorGradientSource.h
+++ src/datasource/ColorGradientSource.h
@@ -1,24 +1,10 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Marco Martin <mart@kde.org>
- * Copyright 2019 David Edmundson <davidedmundson@kde.org>
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Marco Martin <mart@kde.org>
+ * SPDX-FileCopyrightText: 2019 David Edmundson <davidedmundson@kde.org>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef COLORGRADIENTSOURCE_H
Index: src/datasource/ColorGradientSource.cpp
===================================================================
--- src/datasource/ColorGradientSource.cpp
+++ src/datasource/ColorGradientSource.cpp
@@ -1,24 +1,10 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Marco Martin <mart@kde.org>
- * Copyright 2019 David Edmundson <davidedmundson@kde.org>
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Marco Martin <mart@kde.org>
+ * SPDX-FileCopyrightText: 2019 David Edmundson <davidedmundson@kde.org>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ColorGradientSource.h"
Index: src/datasource/ModelHistorySource.h
===================================================================
--- src/datasource/ModelHistorySource.h
+++ src/datasource/ModelHistorySource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef MODELHISTORYSOURCE_H
Index: src/datasource/ModelHistorySource.cpp
===================================================================
--- src/datasource/ModelHistorySource.cpp
+++ src/datasource/ModelHistorySource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ModelHistorySource.h"
Index: src/datasource/ModelSource.h
===================================================================
--- src/datasource/ModelSource.h
+++ src/datasource/ModelSource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef MODELSOURCE_H
Index: src/datasource/ModelSource.cpp
===================================================================
--- src/datasource/ModelSource.cpp
+++ src/datasource/ModelSource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ModelSource.h"
Index: src/datasource/SingleValueSource.h
===================================================================
--- src/datasource/SingleValueSource.h
+++ src/datasource/SingleValueSource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef SINGLEVALUESOURCE_H
Index: src/datasource/SingleValueSource.cpp
===================================================================
--- src/datasource/SingleValueSource.cpp
+++ src/datasource/SingleValueSource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "SingleValueSource.h"
Index: src/datasource/ValueHistorySource.h
===================================================================
--- src/datasource/ValueHistorySource.h
+++ src/datasource/ValueHistorySource.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef VALUEHISTORYSOURCE_H
Index: src/datasource/ValueHistorySource.cpp
===================================================================
--- src/datasource/ValueHistorySource.cpp
+++ src/datasource/ValueHistorySource.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "ValueHistorySource.h"
Index: src/decorations/AxisLabels.h
===================================================================
--- src/decorations/AxisLabels.h
+++ src/decorations/AxisLabels.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef AXISLABELS_H
Index: src/decorations/AxisLabels.cpp
===================================================================
--- src/decorations/AxisLabels.cpp
+++ src/decorations/AxisLabels.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "AxisLabels.h"
Index: src/decorations/GridLines.h
===================================================================
--- src/decorations/GridLines.h
+++ src/decorations/GridLines.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef GRIDLINES_H
Index: src/decorations/GridLines.cpp
===================================================================
--- src/decorations/GridLines.cpp
+++ src/decorations/GridLines.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "GridLines.h"
Index: src/decorations/LegendModel.h
===================================================================
--- src/decorations/LegendModel.h
+++ src/decorations/LegendModel.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LEGENDMODEL_H
Index: src/decorations/LegendModel.cpp
===================================================================
--- src/decorations/LegendModel.cpp
+++ src/decorations/LegendModel.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LegendModel.h"
Index: src/scenegraph/BarChartNode.h
===================================================================
--- src/scenegraph/BarChartNode.h
+++ src/scenegraph/BarChartNode.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef BARCHARTNODE_H
Index: src/scenegraph/BarChartNode.cpp
===================================================================
--- src/scenegraph/BarChartNode.cpp
+++ src/scenegraph/BarChartNode.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "BarChartNode.h"
Index: src/scenegraph/LineChartMaterial.h
===================================================================
--- src/scenegraph/LineChartMaterial.h
+++ src/scenegraph/LineChartMaterial.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINECHARTMATERIAL_H
Index: src/scenegraph/LineChartMaterial.cpp
===================================================================
--- src/scenegraph/LineChartMaterial.cpp
+++ src/scenegraph/LineChartMaterial.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LineChartMaterial.h"
Index: src/scenegraph/LineChartNode.h
===================================================================
--- src/scenegraph/LineChartNode.h
+++ src/scenegraph/LineChartNode.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINECHARTNODE_H
Index: src/scenegraph/LineChartNode.cpp
===================================================================
--- src/scenegraph/LineChartNode.cpp
+++ src/scenegraph/LineChartNode.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LineChartNode.h"
Index: src/scenegraph/LineGridNode.h
===================================================================
--- src/scenegraph/LineGridNode.h
+++ src/scenegraph/LineGridNode.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINEGRIDNODE_H
Index: src/scenegraph/LineGridNode.cpp
===================================================================
--- src/scenegraph/LineGridNode.cpp
+++ src/scenegraph/LineGridNode.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LineGridNode.h"
Index: src/scenegraph/LineSegmentNode.h
===================================================================
--- src/scenegraph/LineSegmentNode.h
+++ src/scenegraph/LineSegmentNode.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINESEGMENTNODE_H
Index: src/scenegraph/LineSegmentNode.cpp
===================================================================
--- src/scenegraph/LineSegmentNode.cpp
+++ src/scenegraph/LineSegmentNode.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "LineSegmentNode.h"
Index: src/scenegraph/PieChartMaterial.h
===================================================================
--- src/scenegraph/PieChartMaterial.h
+++ src/scenegraph/PieChartMaterial.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef PIECHARTMATERIAL_H
Index: src/scenegraph/PieChartMaterial.cpp
===================================================================
--- src/scenegraph/PieChartMaterial.cpp
+++ src/scenegraph/PieChartMaterial.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "PieChartMaterial.h"
Index: src/scenegraph/PieChartNode.h
===================================================================
--- src/scenegraph/PieChartNode.h
+++ src/scenegraph/PieChartNode.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef PIECHARTNODE_H
Index: src/scenegraph/PieChartNode.cpp
===================================================================
--- src/scenegraph/PieChartNode.cpp
+++ src/scenegraph/PieChartNode.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "PieChartNode.h"
Index: src/scenegraph/SDFShader.h
===================================================================
--- src/scenegraph/SDFShader.h
+++ src/scenegraph/SDFShader.h
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef SDF_SHADER_H
Index: src/scenegraph/SDFShader.cpp
===================================================================
--- src/scenegraph/SDFShader.cpp
+++ src/scenegraph/SDFShader.cpp
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #include "SDFShader.h"
Index: src/shaders/desktop_header.glsl
===================================================================
--- src/shaders/desktop_header.glsl
+++ src/shaders/desktop_header.glsl
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This file contains common directives needed for the shaders to work.
Index: src/shaders/desktop_header_core.glsl
===================================================================
--- src/shaders/desktop_header_core.glsl
+++ src/shaders/desktop_header_core.glsl
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This file contains common directives needed for the shaders to work.
Index: src/shaders/es_header.glsl
===================================================================
--- src/shaders/es_header.glsl
+++ src/shaders/es_header.glsl
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This file contains common directives needed for the shaders to work.
Index: src/shaders/linechart.frag
===================================================================
--- src/shaders/linechart.frag
+++ src/shaders/linechart.frag
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This requires "sdf.frag" which is included through SDFShader.
Index: src/shaders/linechart.vert
===================================================================
--- src/shaders/linechart.vert
+++ src/shaders/linechart.vert
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 uniform highp mat4 matrix;
Index: src/shaders/linechart_core.frag
===================================================================
--- src/shaders/linechart_core.frag
+++ src/shaders/linechart_core.frag
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This requires "sdf_core.frag" which is included through SDFShader.
Index: src/shaders/linechart_core.vert
===================================================================
--- src/shaders/linechart_core.vert
+++ src/shaders/linechart_core.vert
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 uniform mat4 matrix;
Index: src/shaders/piechart.frag
===================================================================
--- src/shaders/piechart.frag
+++ src/shaders/piechart.frag
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This requires "sdf.frag" which is included through SDFShader.
Index: src/shaders/piechart.vert
===================================================================
--- src/shaders/piechart.vert
+++ src/shaders/piechart.vert
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 uniform highp mat4 matrix;
Index: src/shaders/piechart_core.frag
===================================================================
--- src/shaders/piechart_core.frag
+++ src/shaders/piechart_core.frag
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 // This requires "sdf_core.frag" which is included through SDFShader.
Index: src/shaders/piechart_core.vert
===================================================================
--- src/shaders/piechart_core.vert
+++ src/shaders/piechart_core.vert
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 uniform mat4 matrix;
Index: src/shaders/sdf.frag
===================================================================
--- src/shaders/sdf.frag
+++ src/shaders/sdf.frag
@@ -1,26 +1,10 @@
-// Copyright (c) 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+// SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+// SPDX-FileCopyrightText: 2017 Inigo Quilez
+//
+// SPDX-License-Identifier: MIT
 //
 // This file is based on
 // https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
-//
-// The MIT License
-// Copyright © 2017 Inigo Quilez
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions: The above copyright
-// notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
 
 //if not GLES
 // include "desktop_header.glsl"
Index: src/shaders/sdf_core.frag
===================================================================
--- src/shaders/sdf_core.frag
+++ src/shaders/sdf_core.frag
@@ -1,26 +1,10 @@
-// Copyright (c) 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+// SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+// SPDX-FileCopyrightText: 2017 Inigo Quilez
+//
+// SPDX-License-Identifier: MIT
 //
 // This file is based on
 // https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
-//
-// The MIT License
-// Copyright © 2017 Inigo Quilez
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions: The above copyright
-// notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
 
 //include "desktop_header_core.glsl"
 
Index: src/shaders/uv.vert
===================================================================
--- src/shaders/uv.vert
+++ src/shaders/uv.vert
@@ -1,22 +1,8 @@
 /*
  * This file is part of KQuickCharts
- * Copyright 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
+ * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) version 3, or any
- * later version accepted by the membership of KDE e.V. (or its
- * successor approved by the membership of KDE e.V.), which shall
- * act as a proxy defined in Section 6 of version 3 of the license.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 uniform highp mat4 matrix;