Sorry for reviving a long dead thread, and de-railing it but Encryption meathods are of interest to me and It would be sort of strange to Start a thread with a quote as a first post. Anyway, IQ say Xors are a nasty but effective hack to make the games run... But to my understanding, Xors Decrypt by XORing the file with the key, and Xors are derivied by comparing the Decrypted rom to the encrypted. So I don't understand why he says the CPS2 games havn't been decrypted. I just want to know if i'm completely wrong on how this works, and why emulators don't just run a decrypted rom. The unencrypted game was required to create the xor was it not? and even if not, can't the Xor create a decrypted rom? by the way, I realize IQ is probably not going to reply since this last post was one this thread and it was on november. that's why I refered to him in 3rd person.