The encryption system used to control the content on hd-dvds is an AES based publickey system. This is one of the public keys assigned to a player, allowing that player to play the content. It had to be brutally ripped from the memory of a running program, because they want to keep the children safe from pirated movies.
Some people posted it, and the MPAA/AACS group immediately sent DMCA 'takedown' notices ordering people to take down this (a hexidecimal representation of a number).
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Cheers, @Kraln