For PC-based playback to be successful, both the player and the drive must not be on the revocation list. The MKB in each disc has a Host Revocation List for software players and a Device Revocation List for hardware drives. The shared key generated by using these two (Media Key) is used to decrypt the Title Key, which is then used to decrypt the audio/video data in the disc. Each Blu-ray player / device has a Device Key, while discs come with a Media Key Block (MKB). AACS also provides for protected storage through the Managed Copy feature.Ī Popular Webcomic's Take on DRM (c) xkcdĪACS uses 128-bit AES for encryption. In Blu-rays, this DRM scheme is called as AACS (Advanced Access Content System). Protected distribution is enabled by the DRM mechanism in Blu-rays / DVDs.
Protected storage is encountered in broadcast content, with its copy flags to allow DVR archiving. Protected transmission is the path to the display device, and it is usually protected by HDCP (over HDMI) or Macrovision in legacy systems.
For the consumer, this entails:Ĭonditional access is applicable to cases where media travels over insecure channels (such as satellite or cable). Content providers mandate the presence of protection schemes at all times when the consumers want to access their wares.
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