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> Qt is not open source Not only is Qt open source, it is also free software according to FSF. Core Qt and most modules are released under the LGPL, the rest u
by gioele 10y ago
> Qt is not open source
Not only is Qt open source, it is also free software according to FSF. Core Qt and most modules are released under the LGPL, the rest under the GPL.
https://www.qt.io/licensing/ https://www.qt.io/licensing/
Qt even has a binding poison-pill promise that will make the code BSD-licensed should Qt (the company) stop releasing it. See https://www.kde.org/community/whatiskde/Software_License_Agreement_2015.pdf https://www.kde.org/community/whatiskde/Software_License_Agr... and https://www.kde.org/community/whatiskde/kdefreeqtfoundation.php https://www.kde.org/community/whatiskde/kdefreeqtfoundation....
- jaysoncena 10y agoHe's probably referring to QT5. If you're a for-profit business and using QT, most likely your software is closed-sourced which requires a commercial license. I've worked with a team who develops a windows app which still uses QT4. They cannot migrate to QT5 since it requires a commercial license.
- blub 10y agoOpen source doesn't always mean that one can do whatever they want with it, nor does it mean gratis. Still, LGPL libraries can be used for commercial software, this is a rather common use case.
- SkyMarshal 10y agoYes, we looked at Qt 1.5yrs ago, and we were a for-profit startup creating an MIT-licensed open source desktop software that we needed to add a UI to, for which we were considering Qt5 for specific features. It was a weird, edge case mix.