Yeah, what happens is, I recover the account with the black ops on it, I transfer the license to my xbox, then I can play black ops with any account on my xbox. To play it on yours, you have to recover the account back that originally downloaded black ops, and be logged in to play it, on that account. So if you want to play under a different username, you log into that account with controller 1, then click multiplayer with controller 2, if you get what Im saying?
Offer how much you want for it, and all it'd take is the time for me to download black ops, I'm not sure how big it is, but it only took me like 2 hours to download BFBC2, so maybe we could do this at a time before you're going somewhere, or going to bed or something?