I stumbled upon a suggestion for an edit that only added a copyrighted image to an answer, presumably without the authors' consent.
I rejected the edit on this basis (as supposedly it would harm the website), but two other users approved it. AfterAs it has now being accepted, I no longer consider this specific case my problem, so my question is not meant to discuss it specifically.
However, after reading this other discussion, I wonder if I should just ignore this kind of situation, or continue to reject this kind of edit in the future. Are there some guidelines about that?
I'm aware of other posts on the subject of copyrighted material, but my question is what I should do about suggested edits that possibly violate copyright, not about if II can include copyrighted material in my own answers and questions.
Thanks.