Using Qt 5.6 and Later under LGPL
Up to Qt 5.3, things were pretty simple. Most modules were under LGPLv2.1 with the exception of some commercial modules. Starting with Qt 5.4, new Qt modules were published under LGPLv3 and old modules additionally under LGPLv3. With Qt 5.6, we now have quite a patchwork of modules under different licenses. Qt 5.7 will drop LGPLv2.1 completely. Some companies stay on Qt 5.3, because they are afraid of LGPLv3. Let me bring some clarity into this patchwork and explain how you can still use Qt under LGPL and sleep well.
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