Is it possible to use libraries from github in paid commercial/commercial applications?

Question

GitHub

Actually a subject, whether it is possible to use libraries from github-a in paid commercial/commercial applications? What problems can there be?

Answer 1

If the repository contains LICENSE, read it.
If not, normal copyright laws apply by default. That is, no one can reproduce, distribute, or create derivative works of someone else's work: https://help.github.com/articles/open-source-licensing/ In this case, you can try to contact the author of the repository and ask him to explicitly specify the license.