Libraries with which license can I use in an application with paid content?

Question

Android

The application will be free, paid content is planned. What libraries can I use to avoid problems?

Answer 1

the Apache license can also be used without problems

Answer 2

The first thing I remembered: BSD, MIT.

Answer 3

If you use the GPL, you simply have to publish the source.
If you're using BSD, you'll need to provide the source module's copyrights.
Some licenses require publishing the source of only modified code.
Etc.
A lot of commercial software use GPL code....