Anybody know if I can give someone Black ops 2 PC version to someone after I have played it?

I don't know if I can give the code to someone and let them play it THAT way, but I would love to know if I can give someone black ops 2 PC version to someone after I have redeemed the code, and played it.

Just to clarify, I redeemed the code on steam, via bought the game at walmart, then installed it on steam on my account.

HELP!