General information about QT
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Hello dear and respected QT community and developers! I'm new here and wanted to know more about this wonderful product. I read on wikipedia that QT has free licenses and a special commercial. How do these licenses differ from each other? Can I use QT products absolutely free for commercial and non-commercial purposes and not pay any royalties: for example, use QT creator and QT designer and of course the QT framework itself absolutely free? Thanks in advance for your answers!
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Hello dear and respected QT community and developers! I'm new here and wanted to know more about this wonderful product. I read on wikipedia that QT has free licenses and a special commercial. How do these licenses differ from each other? Can I use QT products absolutely free for commercial and non-commercial purposes and not pay any royalties: for example, use QT creator and QT designer and of course the QT framework itself absolutely free? Thanks in advance for your answers!
@Souce-Code said in General information about QT:
Can I use QT products absolutely free for commercial and non-commercial purposes
As long as you can fulfil the LGPLv3 license (and for some parts of Qt also GPL).
The license of the tools (like QtCreator) doesn't matter as long as you don't distribute modified versions of these tools. For example: gcc is GPL but you don't have to make your code OSS if you use gcc to compile it. -
What is roughly meant by the LGPL and GPL? And one more question, it turns out I can fully use QT products absolutely free for commercial and non-commercial purposes? And what is the essence of a paid license then?
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What is roughly meant by the LGPL and GPL? And one more question, it turns out I can fully use QT products absolutely free for commercial and non-commercial purposes? And what is the essence of a paid license then?
@Souce-Code said in General information about QT:
And what is the essence of a paid license then?
Simple: you do not have to fulfil LGPL/GPL, you can do whatever you want. Also, there are some QtCompany products/offerings only available for commercial users. As commercial customer you also get direct support from QtCompany.
"What is roughly meant by the LGPL and GPL?" - first of all, this is user forum, hardly anybody here is a lawyer. LGPL does not force you to make your code open source as long as you link LGPL libraries dynamically (this is different when using static libraries!). GPL basically forces you to make your code open source with both: shared and static linking.
You should read the licenses you're using and also search on the Internet for more details. -
Thank you for your answer! I wanted to write to the official developers about this, but in order to contact them, a paid license is required ...
