I have seen designs ( don't know if copied or converted, legally or otherwise) from Poser artists,  appearing in Second Life.

As long as some other people do not respect the IP of creators, piracy will continue in the real and  virtual worlds.  It is SO difficult to enforce, it borders on the maddening.  

There is definitely something wrong with the fundamental premise underlying the economic behaviour between creator-seller and buyer-user counterparties.  Creator expects buyer to feel satisfied that buyer has paid for lelal right to use.  But in fact, buyer has the additional temptation of illegally selling onwards, or of sharing illegally in a private buying club.  And thereafter come the leaks - some buyers/users offer the item for free, as a bait or otherwise, perhaps for malicious purposes - spreading botnets and malware via illicit downloads.

Maddening, as I said.

Eternal Hobbyist