mw3 steam product code "keygen'

hi guys i down mw3 from website for free but when i want to instell the mw3 from steam after down he ask me for product code

can any one tell me how to get it for free??

please

You cann't get it for free bro !

aaa-aaa-aa
aaa-aaa-ab
aaa-aaa-ac...

oh dear.. *facepalm*

sure , i have cheats for real live , want buy?

/Closed
Asking for "hacks" is not allowed.
There is not keygens.