Qt License

[metRo_]

Hi,
I read this http://blog.qt.nokia.com/2009/11/30/qt-making-the-right-licensing-decision/ but i'm still confused. If i creat an aplication using Qt with LGPL license can i sell it? I need to share the source code of my aplication to sell it? Can't i sell it?

What does mean "if dynamically linking to the Qt library"?

Thanks

[wysota]

You can sell it and you don't have to share the source code.

[squidge]

"dynamically linking" means depending on the Qt DLLs (If windows) or .so files (If Linux).

"statically linking" means Qt is part of your application as the extra files are not required, but this is not compatible with LGPL.

[wysota]

In other words if you don't know what dynamically linking is, it means you are dynamically linking Qt.

[metRo_]

thanks :) Now I just don't understand when I need a comercial license :s

[squidge]

You need a commercial license when: You wish to statically link and keep your source closed, or wish to make modifications to Qt which you wish to keep closed, or wish to obtain support from Nokia.

[wysota]

I think you can buy the latter as a separate service for LGPL as well.

[Talei]

Also one question that confuse me:
Can I statically link qt against my app and sell it? (common procedure on windows, only app no additional libs, if libs license allow that of course)
I read somewhere that I need to redistribute qt libs, so each "client" can simply use lib that suits them. (If I remember correctly LGPL don't allow me to modify any libs )

[Lesiok]

You can statically link Qt only with commercial license.

[squidge]

Yes, you can statically link against Qt and sell it (even without commercial license, Lesiok is incorrect there).

However, your application would then be under GPL license automatically, and so the people who bought your application could request (and you must make available) the source code of your application.

If you purchase a commercial license for Qt, you can use your own license.