[slezyr]

> My company currently uses the LGPL version of Qt, and would gladly pay for the commercial one. In the Trolltech and Nokia days they actually did pay for it, but the prices are no longer affordable us. So we are stuck with the LGPL version for now.

Huh, price isn't even a THAT big problem. Software developed with LGPL version can't use the commercial one.

> 2.13. 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.

https://www.qt.io/faq/

IIRC they aren't really willing to give the permission to switch

[gmueckl]

There is no legal barrier for them to relicense Qt from LGPL to a commercial license for a customer. They are just strongarming customers into paying for licenses early on during development by refusing to do so.

[pknopf]

Absolutely.

My company accidently used one of their GPL-only products (on screen keyboad), thinking it was LGPL. We did the right thing and reached out to them to pay for it after it was already deployed to customers.

We had to pay for the entire Qt platform. 20,000 dollars plus a per-device royalty. That was a big mistake on our part, not paying attention to the licensing.