XBOX LIVE HELP!!!!!!!!!!!?

if my freinds has fallout 3 on his hard drive from games on demand then can i transfer his acc to my hard drive thought usb and play it on my acc or would i have to be logged in to his? i already got his acc on my hard drive and the game is dowlaoded but how can i play the game on my account and not his?|||You can't play it on your account on your 360 because the license is on his 360. You'll only be able to play it on his gamertag while signed into Live. Actually buy the game instead of trying to get it for free.