How do you play empire earth without a CD?

I've tried it and I don't think you can.. It Is Possibleand not too hard. all you need is a no-cd patch, which ive been trying to program one for bf2. i still dont have it though, but my friend does. Ill try to re answer when i find out. They have them for if you lose the cd, but u can get one even if you have the cd. u need a bf2 scrach or something like that i forgot. i had one on my old computer for bf2 but i threw a way