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Every FOSS license from MIT to AGPL allows both commercial and non-commercial use. You are free to sell copies of LGPL software.

Dynamically linking against Qt libraries means that the copyleft is not viral, and your software does not need to be licensed under any GPL-family license.

Yes, you can charge for it.

What you probably are really asking is do I need to release the source code? As long as you are not statically linking an LGPL library... which last I checked a few years ago... mobile required that but not desktop.

Just have the separate qt libraries in the same directory and I believe you should be good.

No, why would it mean that?

I assumed that commercial usage would be incompatible with the LGPL license. Seems like I need to read up on LGPL limitations.

Thank you very much! Without your comment I would have dismissed this option.