User blog comment:ForestFairy/How to Take the Fun Out of Trolling/@comment-25499806-20150604230540/@comment-20644-20150605143708

You're actually not required to handle copyright issues like that. If you see something that's blatantly copy/pasted then you are, of course, free to exercise your own admin prerogative and remove it. Otherwise, if the copyright holder wants to object to its use on Wikia, they can send us a DMCA takedown notice.

I'd also be careful about labeling such people as trolls. They may be trying to productively contribute to your community and are simply ignorant of copyright requirements.