Ps3 World at war map packs?

ok so i would like to have the map packs but at the moment i don't have a lot of money so i would like to know if i could borrow someones psn e-mail and password who has already downloaded them so i can get them for free because my mum won't get mine because she dosent like me using her card i wont hack your account or anything and you can change your password right after if you will please add and tell me over ps3 charhinds96