Once revoked, a drive is not able to read both new and older discs. However, the Host key/certificates are regularly revoked through the propagation of new Blu-ray discs. If libaacs finds a valid processing key for the disc MKB version as well as a valid Host key and certificates, it can start the decryption process from step 2. non revoked by the drive) Host key/certificate a valid (corresponding to the MKB version of the disc) Processing key and a valid (i.e.This is either by providing in the KEYDB.cfg file either (or both): ![]() Using libaacs, the decryption process can skip some of these stages to reach the last step, which allows the media player to play the disc. When this happens, the drive forever loses its capability to use older Host key/certificates. Host key/certification revocation occurs when a newer disc (containing a higher MKB than the previous played disc) is decrypted, or played, or attempted to decrypt or play (the mere insertion of a disc does not update the drive). The software player provides the Host key and certificate, whereas the drive contains a list of the Host key/certificates that have been revoked. The latest MKB is version 78, and many discs actually share the same MKB. MKBs have been renewed since the first commercial Blu-ray release in 2006. Note that it is the disc that contains the MKB. Finally those Title Keys unscramble the disc's protected media content.This VUK is used to unscramble the disc's scrambled Title Keys.That Media Key, together with the disc's Volume ID (VID) obtained by the player presenting a valid Host Certificate to the drive is used to compute the Volume Unique Key (VUK). ![]()
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