Does anyone know how to get the m-disk which is hidden in the Akuda bar in the "dispenser" close to the air-hockey game?

I just read somewhere that you have to go on the official website (www.beyondgoodevil.com), register, enter the dark room, enter the internet code you get when you save, then solve a sort of hangman riddle to obtain the code. So far, however, my internet codes have not been accepted and am waiting for a reply to a letter I wrote to Ubisoft about it.
Good luck!