If you can presently do this on Battle.net with other games, then yeah. I don't know how it works, but "GameSharing" on PS3 consists of letting your friend log in your account as YOU, downloading it on his machine. The problem is, once you let someone else use your account, the person on the other end can steal your account... Sooo.... I suggest thinking really, really hard about this. Is that what you want? Someone to steal your battle.net account? If not, then I strongly advise against this. I strongly suggest you rethink this.