It’s LGPL mostly, with some non-core libraries that are GPL or use other licenses: https://doc.qt.io/qt-6/licensing.html https://doc.qt.io/qt-6/licensing.html

It’s LGPL mostly, with some non-core libraries that are GPL or use other licenses: https://doc.qt.io/qt-6/licensing.html https://doc.qt.io/qt-6/licensing.html Over the years it has been noted by many that Qt’s wording and warnings about the LGPL amount to spreading FUD or outright misinformation in what seems like an attempt to scare managers and C-suite folks into buying commercial licenses “just in case”.