Ok so if I have my nand and my dvd key how is it not possible to get the cpu key? I was just wondering. If you can get your dvd key from having the nand and the cpu key then why cant it be reversed engineered. I know this has probably been asked b4 and i am probably an idiot for asking but it has just been nagging at myh mind.

I'm not quite sure on this, but I do believe the CPU Key decrypts the Nand.
That's not an accurate piece of information, don't go around telling people
Just a theory, I'm somewhat new to JTaging, but i repair xbox's, so i know my way around them.

There are other ways to get your cpu key although.
I believe a method would be to install XBR, i don't have any links but I'm sure someone around the fourm will post something, or just look around!

Good luck!