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).
The software/embedded player's Device Keys, together with the disc's Media Key Block (MKB) data are used to retrieve a "Processing Key", and with that (plus another datum from the MKB) to compute the Media Key.The AACS decryption process for a protected disc by a licensed player goes through four stages: This file is called KEYDB.cfg and is accessed by libaacs in ~/.config/aacs. However, combined with a key database file, it is possible to use it to play Blu-ray discs that use the AACS standard. This project does not offer any key or certificate that could be used to decode encrypted copyrighted material. Libaacs is a research project from the VideoLAN developer team to implement the Advanced Access Content System specification, and distributed as an open-source library. Many articles and research papers describe it in detail at, or. The AACS specification and decryption process are publicly available at. Although the industry was able to revoke the first leaked decryption keys, new keys are regularly published in a cat and mouse play. Many decryption programs were made available, but the interest to Linux users was the capability of playing their discs - legally purchased - on their computers. In 2007, the AACS system was compromised and decryption keys were published on the Internet. Although most of commercial discs use AACS, a few of them additionally use BD+.
Secondly, Blu-ray may also use another layer of protection: BD+. Firstly, the AACS standard uses a lot more complicated cryptographic process to protect the disc content, but also allows the industry to revoke compromised keys and distribute new keys through new discs. 2.5.4 If you have the corresponding VUK but the Blu-ray will not playĬontrary to the DVD CSS, which was definitely compromised once the unique encryption key had been discovered, Blu-ray uses stronger DRM mechanisms, which makes it a lot more difficult to manage.
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