Encryption help

I dont know if anyone can help me here but i can only but try. I've got an XBoX with some karaoke thing on it for my missus and Im fed up of paying $5 a new song from www.xboxkaraoke.com. They encrypt the files to .krk, This file is made up of a .wma (for the music) and a .cdg (for lyrics) and it is encrypted using a 8 digit number which is unique to your XBOX (you give them the number from your xbox upon reg on the site then you get the files for your xbox). Im trying to figure out what this encryption is so I can make my own files and not be ripp'd off. Its either encrpted before the compression, after the compression or compressed somehow using this code you give. When 2 of the same songs which have 2 different xbox codes are compared they are totally different. Has anyone got any pointers on where to go next??

Um read the rules.

Sorry it is annoying when they overcharge but it is the product :D

Make a quick random jukebox on a pc instead :D

Sorry if this sounds snotty but where are the rules?? i cant find the post stating them. Just curoius aswell of why this against the rules as its not hacking and its not warez. Im looking to make these .krk files myself but obviously ill need to know how to do it and the easyiest option is to work out how its done via a pre made one.

Assuming this format is patented and you're not allowed to use it, that illegal thing comes in just about there...

Your asking how to hack the encryption on the file. :)

M$ has people trying to make what people like you want to do not possible, and most of all, not easy.