I'm not a legal, but... feel concerned anyway. A copyright and license story.
Note that I'm actually not a legal person (and this is not legal advice).
As I have been training developers for over 10 years, I still feel a bit baffled by the lack of knowledge regarding licenses and copyright ownership among developers in general.
Probably, in opensource software communities, we are more aware of these subjects. But truth is, when you ask other developers whether they feel confident about their practices to ensure license compatibility, they'll often ask for the full presentation speech.