The first breakthrough came when a hacker named "Muslix64" circumvented both HD DVD copy protection and Blu-ray copy protection, resulting in the release of pirated copies on the Internet. On Sunday, another Doom9 forum poster named "arnezami" discovered how the Processing Key could be used for decryption on both HD DVD and Blu-ray discs (Previously every HD movie needed its own unique key in order to be decrypted). Arnezami used only an Xbox 360 HD DVD player, the bundled King Kong movie and his computer to find the key. Other Doom9 forum contributors proved that both HD DVD and Blu-ray Disc movies could be decrypted using the Processing Key found from King Kong.
Arnezami unlocked the secrets to HD DVD and Blu-ray Disc encryption without the use of any hacked software or hardware: "Most of the time I spend studying the AACS papers. A good understanding of how things worked have helped me greatly in knowing what to find in the first place (and how to recognize something)." Arnezami isn't revealing which software player he used to expose the key information for fear that the Advanced Access Content System Licensing Administrator would crackdown on the software developer. What he did want to say, however, is that he made his discovery simply by watching the data as it passed through his system.