*Source: DailyTech (
http://www.dailytech.com/AACS+Remain...icle7400.htm)*
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Efforts that began in December 2006 and continued through February 2007 lead to the discovery of the Processing Key used to encrypt high-definition media with the Advanced Access Content System. The work of a small hacking community created essentially a silver bullet that was able to defeat the copy protection of all HD DVD and Blu-ray Disc media on the market at that time.
The Advanced Access Content System Licensing Administration (AACS LA) acknowledged the effectiveness of the hack and began to enact measures to restore the integrity of its technology. Beginning May 22, which is most notably the release date of the Matrix trilogy on HD DVD, all high-definition titles shipped with Media Key Block (MKB) v3 – a new encryption key version that would render the previously discovered Processing Key obsolete.
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