High Quality Content by WIKIPEDIA articles! The Q Public License (QPL) is a non-copyleft free software license created by Trolltech for its free edition of the Qt toolkit. It captures the general meaning of the GNU General Public Licence (GPL), but is incompatible with it, meaning that you cannot legally distribute products derived from both GPL'ed and QPL'ed code. It was used until Qt 3.0, as Trolltech toolkit version 4.0 was released under GPL version 2. It also allowed Qt to change the license in later editions of its software, something often also provided in the GPL, and it was also frowned upon that non-free use or development of derivatives was still not allowed. Only the personal edition of Qt was covered by the QPL; the commercial edition, which is functionally equal, is under a pay-per-use license and could not be freely distributed. As KDE, a desktop environment for Linux based on Qt, grew in popularity, the free software community urged Trolltech to put Qt under a license (the QPL) that would assure that it would remain free software forever and could be used and developed by commercial third-parties.

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