Advanced Access Content System: Difference between revisions

Revision as of 02:24, 10 September 2020

Revision as of 21:07, 22 October 2020

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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 combination of 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 principal difference between AACS and [[Content Scramble System|CSS]], (the DRM system used on DVDs and CDs,) lies in how the device decryption keys and codes are organized.

Under CSS, all players of a given model group are provisioned with the same shared activated decryption key. Content is encrypted under the title-specific key, which is itself encrypted under each model's key. Thus each disc contains a collection of several hundred encrypted keys, one for each licensed player model.