Cet extrait de la FAQ de Qt est peut-etre une explication du choix de RedHat et autres :
What kind of licenses exist for Qt?
The Qt toolkit is available under two different licenses: The Professional and Enterprise Editions for commercial use on all platforms, and the Free Edition for developing free/open source software for the X11 platform.
What are the differences between the Professional/Enterprise Editions and Free Edition of Qt?
You may write commercial/proprietary/non-free software only if you have purchased the Professional or Enterprise Edition. The library itself is the same. With the commercial editions, you also get technical support and upgrades. Qt for Microsoft Windows and Qt for Mac OS X are only available as Professional and Enterprise Editions.
Can we use the Free Edition while developing our non-free application and then purchase commercial licenses when we start to sell it?
No. The Free Edition license applies to the development phase - anything developed without Professional or Enterprise Edition licenses must be released as free/open source software
Grosso modo, on ne peut faire du logiciel libre uniquement avec Qt/X11 puisque c'est la seule version disponible en licence libre.
Que devient le code Qt fait par des developpeurs benevoles dans les binaires des autres licences ?
# FAQ de la licence de Qt
Posté par Romain Esnault . En réponse à la dépêche Bero quitte RedHat. Évalué à -1.
What kind of licenses exist for Qt?
The Qt toolkit is available under two different licenses: The Professional and Enterprise Editions for commercial use on all platforms, and the Free Edition for developing free/open source software for the X11 platform.
What are the differences between the Professional/Enterprise Editions and Free Edition of Qt?
You may write commercial/proprietary/non-free software only if you have purchased the Professional or Enterprise Edition. The library itself is the same. With the commercial editions, you also get technical support and upgrades. Qt for Microsoft Windows and Qt for Mac OS X are only available as Professional and Enterprise Editions.
Can we use the Free Edition while developing our non-free application and then purchase commercial licenses when we start to sell it?
No. The Free Edition license applies to the development phase - anything developed without Professional or Enterprise Edition licenses must be released as free/open source software
Grosso modo, on ne peut faire du logiciel libre uniquement avec Qt/X11 puisque c'est la seule version disponible en licence libre.
Que devient le code Qt fait par des developpeurs benevoles dans les binaires des autres licences ?