J'ai la réponse. Qt "free" tourne sous GPL et QPL. Trolltech et Opera ont un accord. http://www.trolltech.com/developer/faqs/license_gpl.html#q114(...)
Q : If the Free Edition is GNU GPL, aren't there license conflicts with incompatible open source licenses? How come people can even run commercial software like the Opera web browser with it?
A : If the Free Edition was licensed purely under the GNU GPL, there would be problems. However, as long as Qt-based software is either open source or was developed under a commercial license agreement with Trolltech, we grant permission to compile, link and run those programs with the Free Edition. This is written down in our second free software license, the Q Public License (QPL).
[^] # Re: j0r, tu delires, firefox ça carbure dur
Posté par 007 . En réponse à la dépêche Firefox 0.9.1 est sorti. Évalué à 1.
http://www.trolltech.com/developer/faqs/license_gpl.html#q114(...)
Q : If the Free Edition is GNU GPL, aren't there license conflicts with incompatible open source licenses? How come people can even run commercial software like the Opera web browser with it?
A : If the Free Edition was licensed purely under the GNU GPL, there would be problems. However, as long as Qt-based software is either open source or was developed under a commercial license agreement with Trolltech, we grant permission to compile, link and run those programs with the Free Edition. This is written down in our second free software license, the Q Public License (QPL).