When I notice that a question, answer or comment links to something relevant, but obviously made available in violation of someone's copyright (like a full book complete with scanned copyright page prohibiting distribution), should I react, and how?
Does it matter if an " I'm lucky " Google query with the work's title gets to the same URL?
Same for some image that shows without user interaction (using e.g.
![description]) obviously made available in violation of a copyright (like an extract of a book, when either the image itself or the context makes the violation obvious)?
Any guideline on the obviousness threshold?
Note: this is not asking how to formally report a copyright violation; in particular, I'm assuming that I am NOT authorized to make the complaint on behalf of the copyright owner, which entirely prevents me from following this procedure.