The site's policy is that exports from other games are not allowed.
However, I feel that it is mostly in regard to models. Don't quote me on it though. I believe, in general, that we (moderators) would be more lenient on sounds. Just for example, iirc Gaia's uses music from TES: Oblivion. I could probably name a hundred other maps that use music from other games.
Will Blizzard do anything about it? Of course not. Will the owner of the resource do anything about it? Certainly not, unless it is from an indy game.. if it is a AAA game they won't care. Will the hive do anything about it? Depends. If the moderator sees an export, he has the option of rejecting it until that export is removed.
Those are my 2 cents. Gather 98 more and get yourself something nice from the dollar store.