Well the SE-Wide policy for moderators and users is quite simple:
Don't be dumb, but if there is a complaint, it's the company's work.
To expand a little:
Don't be dumb:
I know this especially from Anime & Manga. There regularly images get posted. Most of these images are copyrighted in one way or the other. But as long as there's proper attribution where the image comes from, it's mostly okay. Just blatantly pirated and illegal Images are frowned upon. These get removed or replaced by community members., but if there's a complaint:
Or to put it more correctly: "If someone wants to take it down for copyright infringement." Interesting here is especially the DMCA Takedowns for SE, or rather that they are uploaded to the Chilling Effects Clearinghouse. There's a lot more interesting reads about DMCA Takedowns and the like on the internet., it's the company's work:
To make it simple, moderators and community users don't really need to concern themselves for anything but blatant license infringement, and even then you shouldn't do much more than mentioned in rolfl's answer
(Most ppl. won't know how to correctly handle this)