https://community.kde.org/Policies/Licensing_Policy

https://invent.kde.org/education/gcompris/-/commit/1a090e091ebbb57a7de2b99f230deb518b430e1c / https://invent.kde.org/education/gcompris/-/commit/0b4863acbadfc87b139b3f9af76627b33b223e03 -> add licence to all CMake files (BSD-2 or BSD-3 if there is "intelligence")
https://invent.kde.org/education/gcompris/-/commit/07553ad358196c203bd2d835e671cabe3f03287e -> apply to all source files

https://invent.kde.org/sdk/licensedigger/-/commit/b30700e6ef28f035727e548a59364059d75c872e -> add licences in licencedigger tools.

Missing to "port":
"gcompris/android/AndroidManifest.xml.cmake" --> "UNKNOWN-LICENSE"
"gcompris/android/configAndroid.json.cmake" --> "UNKNOWN-LICENSE"
"gcompris/android/src/net/gcompris/GComprisActivity.java" --> "UNKNOWN-LICENSE"
"gcompris/android/strings.xml" --> "UNKNOWN-LICENSE"
"gcompris/docs/docbook/index.docbook" --> "UNKNOWN-LICENSE"
"gcompris/org.kde.gcompris.appdata.xml" --> "UNKNOWN-LICENSE"
"gcompris/platforms/sailfishOS/harbour-gcompris-qt.spec.cmake" --> "UNKNOWN-LICENSE"
"gcompris/src/core/resource/fonts/TTF/feat_set_tuned_Andika.xml" --> "UNKNOWN-LICENSE"

"gcompris/src/activities/analog_electricity/cktsim.js" --> "UNKNOWN-LICENSE"
"gcompris/src/activities/checkers/engine.js" --> "UNKNOWN-LICENSE"
"gcompris/src/activities/chess/engine.js" --> "UNKNOWN-LICENSE"
"gcompris/src/core/AnswerButton.qml" --> "UNKNOWN-LICENSE"