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BackupHDDVD is a small computer software utility program available in command line and GUI versions which aids in the decryption of commercial HD DVD discs protected by the Advanced Access Content System. It is used to back up discs, often to enable playback on hardware configurations without full support for HDCP. The program's source code was posted online, but no licence information was given. Written by an anonymous programmer using the handle Muslix64, BackupHDDVD is distributed with none of the cryptographic keys necessary for decryption. Users wanting to use the software to decrypt a protected disc's contents must obtain the appropriate keys separately, a task with which neither the original author nor his or her versions of BackupHDDVD assist. BackupHDDVD represented the first known successful attack against AACS. The utility circumvents content protection by decrypting video files directly with AES, the underling cryptographic cipher used by AACS. Using this technique, BackupHDDVD is able to completely bypass the AACS chain of trust, rendering it immune to revocation. The cost of this immunity is that users are forced to rely on keys leaking from commercial player software to use BackupHDDVD with new discs. == History == According to the creator of BackupHDDVD, he or she first set out to circumvent AACS to bypass a restriction in software HD DVD players which reduced the quality of AACS restricted 1080p high definition video to that of standard definition DVD video or refused to play outright unless an HDCP compliant chain of video hardware was present.〔 At the time only a few computer monitors and video cards supported HDCP. As a result, configurations that would have allowed high-definition HD DVD viewing in software players were exceptionally rare. On December 18, 2006, a video which showed BackupHDDVD being used to decrypt and copy the film ''Full Metal Jacket'' to a hard drive was uploaded to YouTube.〔(【引用サイトリンク】title= 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BackupHDDVD」の詳細全文を読む スポンサード リンク
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