Quote:
Originally Posted by WalrossGreat
> Qt is open source and you could not sell your program without a commercial license.
That doesn't mean, that you can't sell your program, dynamically linking to qt libs and you are fine.
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Complete corresponding source code of the library used with the application or the device built using LGPL, including all modifications to the library, should be delivered with the application (or alternatively provide a written offer with instructions on how to get the source code).
It should be noted that the complete corresponding source code has to be delivered even if the library has not been modified at all.
In case of dynamic linking, it is possible, but not mandatory, to keep application source code proprietary as long as it is “work that uses the library” – typically achieved via dynamic linking of the library. In case of static linking of the library, the application itself may no longer be “work that uses the library” and thus become subject to LGPL. It is recommended to either link dynamically, or provide the application source code to the user under LGPL.
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If the application or device is not fully following all requirements of the LGPL, it is not allowed to be distributed at all. This includes, for example, possible patent license restricting distribution of the application in which case there is no right to distribute.
This is not a complete list of LGPL requirements – please refer to the LGPL for complete list of requirements – it is always recommended to contact an experienced legal counsel to clarify detailed licensing suitability. Please note that The Qt Company does not offer legal guidance on whether or not a certain license is suited for your need, or if your application or device meets the LGPL requirements. In case there is any doubt whether or not the requirements of LGPL can be met in full, the commercial licensing option of Qt is often the best choice.