Play cracked games?

I am looking for a way to play games that are cracked online. I know they would need to be played on a cracked server, and that’s fine. But how do I get it to work without getting the Invalid CD key error? The games I am trying to get this to work on are:
battlefield 1942 battlefield: Vietnam
battlefield 1942: Secret weapons of WWII
Any help would be great! I do have the specs for it and can play on single player just fine. I have the no-CD patches as well….
Answer #1
Anyone?