The license explicitly specifies that you cannot start developing using the free license and then purchase a commercial license when going commercial.
Re:Qt 6.0
by blockmeifyoucan on Wednesday December 09, 2020 @12:55AM
(#25355766)
Can you please cite and link the relevant part?
Re:Qt 6.0
by Buttons840 on Wednesday December 09, 2020 @02:22AM
(#25356187)
> If I have started development of a project using the open source version (LGPL), can I later purchase a commercial version of Qt and move my code under that license?
This is not permitted without written consent from The Qt Company. If you have already started the development with an open-source version of Qt, please contact The Qt Company to resolve the issue. If you are unsure of which license or version to use when you start development, we recommend you contact The Qt Company to advise you on the best choice based on your development needs.
I'm not sure how they can prevent you from transitioning from an open source license to a commercial license? You can develop your app for a year either as open source or privately without releasing anything, and then decide to purchase a license? Not sure if I'm missing something, but how does could they prevent this (legally or practically)?