Re: Card Number?
You're right, but you can't.
NDS decryption is only available on Sky hardware and some professional IRD's.
Not sure if it still works but....... If you had particular CAMs (I think one was the Dragon) you could use your sky card in that and the receiver of your choice. The only thing you had to do from memory was put it in a genuine and sky box every so often so that it received the keep alive signal. NDS were not pleased about this I believe and new cards were issued at some point to counter it.