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AACS uses cryptography to control and restrict the use of digital media. It encrypts content under one or more title keys using the Advanced Encryption Standard (AES). Title keys are decrypted using a media key (encoded in a Media Key Block) and the Volume ID of the media (e.g., a physical serial number embedded on a pre-recorded disc).
The AACS system relies on a subset difference tree combined with a certificate revocation mechanism to ensure the security of high definition video content in the event of a compromise. Even before AACS was put into use, security researchers expressed doubts about the system's ability to withstand attacks. AACS decryption process
Initially, it was thought that the compromise of HD DVD's security would entice some studios into adopting the competing Blu-ray format, but Blu-ray's AACS implementation has since been circumvented using a similar method. However, Blu-ray offers an additional layer of protection called BD+.
The library is used in VLC media player and is able to decode DTS audio tracks from DVDs. It can also decode DTS files (.dts) directly, as well as DTS-WAV files (.wav). libdca is able to decode DTS-ES streams as well, however can only decode the standard 6 channels as the additional "Extended Surround" extensions (for Matrix and 6.1 Discrete ...
libdvdcss (or libdvdcss2 in some repositories) is a free and open-source software library for accessing and unscrambling DVDs encrypted with the Content Scramble System (CSS). libdvdcss is part of the VideoLAN project and is used by VLC media player and other DVD player software packages, such as Ogle, xine-based players, and MPlayer.
The popular MPV, xine and VLC media players use it as their main, built-in decoding engine that enables playback of many audio and video formats on all supported platforms. It is also used by the ffdshow tryouts decoder as its primary decoding library. libavcodec is also used in video editing and transcoding applications like Avidemux ...
The content stored in medias like Blu-ray or HD-DVDs is composed and divided in information units called Titles. The owner of the protected contents, divide this information in the form of one or more Titles. It also provides a license to the player, a series of rules called Usage Rules which will be used later on to decrypt the disc information.
Media Key Block structure. Even though it seems a simple mechanism the MKB key which is found in the physical support of the disc follows a complex structure. The MKB is distributed in blocks that contain the version of the Media key, the list of devices that have been revoked, a field to authenticate the MKB, and other fields that specify parameters corresponding to the decrypting algorithm ...