This is a common LGPL misconception frequently seen. IANAL, but even if you make a modified version of Qt and release it, you are still free to use that same m

This is a common LGPL misconception frequently seen. IANAL, but even if you make a modified version of Qt and release it, you are still free to use that same modified version in your app without releasing it as open source, as long as you are using dynamic linking instead of static. But, the same restriction also apply to original Qt. Btw, what you can't do is using modified version of Qt without releasing the source of your Qt modification upon request.