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Qt is LGPL, so unless you need to link to it statically or make proprietary modifications to Qt itself, you don't need to pay licensing costs.

Ah right, I wasn't aware of that.

Qt is (largely; a couple of optional components are GPL) LGPLv3, so can be used commercially without getting the commercial license.

Oh, lets be professionals and not pay for our tools like everyone else does, who needs money anyway!