diff --git a/LICENSES/LGPL-2.0-only.txt b/LICENSES/LGPL-2.0-only.txt
new file mode 100644
--- /dev/null
+++ b/LICENSES/LGPL-2.0-only.txt
@@ -0,0 +1,446 @@
+GNU LIBRARY GENERAL PUBLIC LICENSE
+
+Version 2, June 1991 Copyright (C) 1991 Free Software Foundation, Inc.
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+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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+Everyone is permitted to copy and distribute verbatim copies of this license
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diff --git a/LICENSES/LGPL-2.0-or-later.txt b/LICENSES/LGPL-2.0-or-later.txt
new file mode 100644
--- /dev/null
+++ b/LICENSES/LGPL-2.0-or-later.txt
@@ -0,0 +1,446 @@
+GNU LIBRARY GENERAL PUBLIC LICENSE
+
+Version 2, June 1991 Copyright (C) 1991 Free Software Foundation, Inc.
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+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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+Everyone is permitted to copy and distribute verbatim copies of this license
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+[This is the first released version of the library GPL. It is numbered 2 because
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diff --git a/LICENSES/LGPL-2.1-only.txt b/LICENSES/LGPL-2.1-only.txt
new file mode 100644
--- /dev/null
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@@ -0,0 +1,467 @@
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diff --git a/LICENSES/LGPL-3.0-only.txt b/LICENSES/LGPL-3.0-only.txt
new file mode 100644
--- /dev/null
+++ b/LICENSES/LGPL-3.0-only.txt
@@ -0,0 +1,163 @@
+GNU LESSER GENERAL PUBLIC LICENSE
+
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license
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+This version of the GNU Lesser General Public License incorporates the terms
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+by the additional permissions listed below.
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+   0. Additional Definitions.
+
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+
+As used herein, "this License" refers to version 3 of the GNU Lesser General
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+License ever published by the Free Software Foundation.
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diff --git a/LICENSES/LicenseRef-KDE-Accepted-LGPL.txt b/LICENSES/LicenseRef-KDE-Accepted-LGPL.txt
new file mode 100644
--- /dev/null
+++ b/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.
diff --git a/autotests/deadservicetest.cpp b/autotests/deadservicetest.cpp
--- a/autotests/deadservicetest.cpp
+++ b/autotests/deadservicetest.cpp
@@ -1,20 +1,9 @@
-/* This file is part of libkdbus
+/*
+   This file is part of libkdbus
 
-   Copyright (c) 2019 Harald Sitter <sitter@kde.org>
+    SPDX-FileCopyrightText: 2019 Harald Sitter <sitter@kde.org>
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License version 2 as published by the Free Software Foundation.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include <QDBusConnection>
diff --git a/autotests/kdbusinterprocesslocktest.cpp b/autotests/kdbusinterprocesslocktest.cpp
--- a/autotests/kdbusinterprocesslocktest.cpp
+++ b/autotests/kdbusinterprocesslocktest.cpp
@@ -1,20 +1,9 @@
-/* This file is part of libkdbus
+/*
+    This file is part of libkdbus
 
-   Copyright (c) 2011 Kevin Ottens <ervin@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License version 2 as published by the Free Software Foundation.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include <QCoreApplication>
diff --git a/autotests/kdbusservicetest.cpp b/autotests/kdbusservicetest.cpp
--- a/autotests/kdbusservicetest.cpp
+++ b/autotests/kdbusservicetest.cpp
@@ -1,22 +1,11 @@
-/* This file is part of libkdbus
+/*
+    This file is part of libkdbus
 
-   Copyright (c) 1999 Waldo Bastian <bastian@kde.org>
-   Copyright (c) 2011 David Faure <faure@kde.org>
-   Copyright (c) 2011 Kevin Ottens <ervin@kde.org>
+    SPDX-FileCopyrightText: 1999 Waldo Bastian <bastian@kde.org>
+    SPDX-FileCopyrightText: 2011 David Faure <faure@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License version 2 as published by the Free Software Foundation.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include <QCoreApplication>
diff --git a/autotests/kdbussimpleservice.cpp b/autotests/kdbussimpleservice.cpp
--- a/autotests/kdbussimpleservice.cpp
+++ b/autotests/kdbussimpleservice.cpp
@@ -1,20 +1,9 @@
-/* This file is part of libkdbus
+/*
+    This file is part of libkdbus
 
-   Copyright (c) 2019 Harald Sitter <sitter@kde.org>
+    SPDX-FileCopyrightText: 2019 Harald Sitter <sitter@kde.org>
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License version 2 as published by the Free Software Foundation.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include <QCoreApplication>
diff --git a/src/kdbusconnectionpool.h b/src/kdbusconnectionpool.h
--- a/src/kdbusconnectionpool.h
+++ b/src/kdbusconnectionpool.h
@@ -1,22 +1,9 @@
 /*
- * This file is part of the KDE Frameworks.
- * Copyright (C) 2010 Sebastian Trueg <trueg@kde.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
+    This file is part of the KDE Frameworks.
+    SPDX-FileCopyrightText: 2010 Sebastian Trueg <trueg@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
 
 #ifndef KDBUSCONNECTIONPOOL_H
 #define KDBUSCONNECTIONPOOL_H
diff --git a/src/kdbusconnectionpool.cpp b/src/kdbusconnectionpool.cpp
--- a/src/kdbusconnectionpool.cpp
+++ b/src/kdbusconnectionpool.cpp
@@ -1,23 +1,10 @@
 /*
- * This file is part of the KDE Frameworks.
- * Copyright (C) 2010 Sebastian Trueg <trueg@kde.org>
- * Copyright (C) 2010 David Faure <faure@kde.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
+    This file is part of the KDE Frameworks.
+    SPDX-FileCopyrightText: 2010 Sebastian Trueg <trueg@kde.org>
+    SPDX-FileCopyrightText: 2010 David Faure <faure@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
 
 #include "kdbusconnectionpool.h"
 #include <QThreadStorage>
diff --git a/src/kdbusinterprocesslock.h b/src/kdbusinterprocesslock.h
--- a/src/kdbusinterprocesslock.h
+++ b/src/kdbusinterprocesslock.h
@@ -1,23 +1,10 @@
-/* This file is part of libkdbus
-
-   Copyright (C) 2009 Tobias Koenig (tokoe@kde.org)
-   Copyright (C) 2011 Kevin Ottens (ervin@kde.org)
-
-   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 <http://www.gnu.org/licenses/>.
+/*
+    This file is part of libkdbus
+
+    SPDX-FileCopyrightText: 2009 Tobias Koenig <tokoe@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #ifndef KDBUSINTERPROCESSLOCK_H
diff --git a/src/kdbusinterprocesslock.cpp b/src/kdbusinterprocesslock.cpp
--- a/src/kdbusinterprocesslock.cpp
+++ b/src/kdbusinterprocesslock.cpp
@@ -1,23 +1,10 @@
-/* This file is part of the KDE
-
-   Copyright (C) 2009 Tobias Koenig (tokoe@kde.org)
-   Copyright (C) 2011 Kevin Ottens (ervin@kde.org)
-
-   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 <http://www.gnu.org/licenses/>.
+/*
+    This file is part of the KDE
+
+    SPDX-FileCopyrightText: 2009 Tobias Koenig <tokoe@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "kdbusinterprocesslock.h"
diff --git a/src/kdbusservice.h b/src/kdbusservice.h
--- a/src/kdbusservice.h
+++ b/src/kdbusservice.h
@@ -1,23 +1,10 @@
-/* This file is part of libkdbusaddons
+/*
+    This file is part of libkdbusaddons
 
-   Copyright (c) 2011 David Faure <faure@kde.org>
-   Copyright (c) 2011 Kevin Ottens <ervin@kde.org>
+    SPDX-FileCopyrightText: 2011 David Faure <faure@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
 
-   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 <http://www.gnu.org/licenses/>.
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #ifndef KDBUSSERVICE_H
diff --git a/src/kdbusservice.cpp b/src/kdbusservice.cpp
--- a/src/kdbusservice.cpp
+++ b/src/kdbusservice.cpp
@@ -1,24 +1,11 @@
-/* This file is part of libkdbusaddons
-
-   Copyright (c) 2011 David Faure <faure@kde.org>
-   Copyright (c) 2011 Kevin Ottens <ervin@kde.org>
-   Copyright (c) 2019 Harald Sitter <sitter@kde.org>
-
-   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 <http://www.gnu.org/licenses/>.
+/*
+    This file is part of libkdbusaddons
+
+    SPDX-FileCopyrightText: 2011 David Faure <faure@kde.org>
+    SPDX-FileCopyrightText: 2011 Kevin Ottens <ervin@kde.org>
+    SPDX-FileCopyrightText: 2019 Harald Sitter <sitter@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "kdbusservice.h"
diff --git a/src/kdedmodule.h b/src/kdedmodule.h
--- a/src/kdedmodule.h
+++ b/src/kdedmodule.h
@@ -1,22 +1,9 @@
 /*
-   This file is part of the KDE libraries
+    This file is part of the KDE libraries
 
-   Copyright (c) 2001 Waldo Bastian <bastian@kde.org>
+    SPDX-FileCopyrightText: 2001 Waldo Bastian <bastian@kde.org>
 
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License as published by the Free Software Foundation; either
-   version 2 of the License, or (at your option) any later version.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-License-Identifier: LGPL-2.0-or-later
 
 */
 #ifndef __KDEDMODULE_H__
diff --git a/src/kdedmodule.cpp b/src/kdedmodule.cpp
--- a/src/kdedmodule.cpp
+++ b/src/kdedmodule.cpp
@@ -1,23 +1,9 @@
 /*
-   This file is part of the KDE libraries
+    This file is part of the KDE libraries
 
-   Copyright (c) 2001 Waldo Bastian <bastian@kde.org>
-
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public
-   License as published by the Free Software Foundation; either
-   version 2 of the License, or (at your option) any later version.
-
-   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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public License
-   along with this library; see the file COPYING.LIB.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
+    SPDX-FileCopyrightText: 2001 Waldo Bastian <bastian@kde.org>
 
+    SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kdedmodule.h"
diff --git a/src/kdeinitinterface.h b/src/kdeinitinterface.h
--- a/src/kdeinitinterface.h
+++ b/src/kdeinitinterface.h
@@ -1,22 +1,9 @@
-/* This file is part of libkdbusaddons
+/*
+    This file is part of libkdbusaddons
 
-   Copyright (c) 2013 David Faure <faure@kde.org>
+    SPDX-FileCopyrightText: 2013 David Faure <faure@kde.org>
 
-   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 <http://www.gnu.org/licenses/>.
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #ifndef KDEINIT_IFACE_H
diff --git a/src/kdeinitinterface.cpp b/src/kdeinitinterface.cpp
--- a/src/kdeinitinterface.cpp
+++ b/src/kdeinitinterface.cpp
@@ -1,22 +1,9 @@
-/* This file is part of libkdbusaddons
+/*
+    This file is part of libkdbusaddons
 
-   Copyright (c) 2013 David Faure <faure@kde.org>
+    SPDX-FileCopyrightText: 2013 David Faure <faure@kde.org>
 
-   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 <http://www.gnu.org/licenses/>.
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "kdeinitinterface.h"
diff --git a/src/tools/kquitapp/kquitapp.cpp b/src/tools/kquitapp/kquitapp.cpp
--- a/src/tools/kquitapp/kquitapp.cpp
+++ b/src/tools/kquitapp/kquitapp.cpp
@@ -1,20 +1,8 @@
 /*
- *   Copyright (C) 2006 Aaron Seigo <aseigo@kde.org>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Library General Public License version 2 as
- *   published by the Free Software Foundation
- *
- *   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
- *
- *   You should have received a copy of the GNU Library General Public
- *   License along with this program; if not, write to the
- *   Free Software Foundation, Inc.,
- *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- */
+    SPDX-FileCopyrightText: 2006 Aaron Seigo <aseigo@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.0-only
+*/
 
 #include <QCoreApplication>
 #include <QCommandLineParser>