I don't know how it is in your country, but in germany has EVERYTHING a copyright even when there is no copyright information. And with copyright I mean the german "Urheberrecht". (Thats similar to copyright) And this server stands in germany so DC would make a crime if he allowed to copy other stuff. And if they want to publish it under a CC license they have to mark it. And don't remembering where you got your skins, etc. is a bad excuse. And just by the way: There are different CC license types. And like TKD said:
TheKilledDeath has written
It's a copyright infringement!
Maybe you can steal pictures, etc. in your country, but in germany its different.
Jermuk aka Dönarmaster