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independent The decryptor and the decoder can be implemented in hardware or software The system is expected to protect the decrypted data from being copied This is the state in which the content is considered to be most valuable Once it has been decoded, requirements to protect the content are less stringent, especially because no mechanism protects RGB VGA output After the video and audio is decrypted and decoded, the video is sent to the display and the audio is sent to the audio hardware CSS Authentication and Decryption CSS is essentially a cryptographic method for the distribution and management of cryptographic keys The decoder or the OS (referred to as the player in this discussion) and the DVD drive engage in a handshaking protocol in which all the communication between them is encrypted After verifying that the decryption module is registered and not compromised (which is done by using a specific hash algorithm to match the decoder key to a key in the key block on the disc), the DVD drive passes the content key, copy control information, and encrypted content to the decryption module The decrypted content is then sent on a secure channel to the decoder The decoded content, along with the copy control information, is communicated to the video controller where it is converted to video signals The control information tells the video controller if an analog protection scheme must be applied prior to delivering the video signals to the display The authentication process works roughly as follows (refer to Figure 112) The player and the drive generate random numbers and send them to each other Each encrypts the number using a CSS hash function (which turns a 40-bit number into an 80-bit number) and sends back the result, called a challenge key If the recipient can decode the number using the same function, then it knows that the other device is a bona fide member of the CSS club Once the authentication process is complete, the drive sets a flag to provide access to encrypted sectors All sectors on the disc can then be read (by any program), but encrypted sectors must be decrypted to be of any use The second stage of CSS is to decrypt protected content Each device uses challenge keys from the authentication step to generate a bus key The bus key, which is never sent over the bus, is used to encrypt further key exchanges using a simple XOR operation Each player has a key (or set of keys) assigned to it by the licensing authority Each disc has a 2048-byte key block stored in the control area The key block contains disc keys encrypted with 409 player keys The purpose of this arrangement is that if a player key is known to be compromised, future discs can omit the encrypted key for that player, rendering the player unable to retrieve the.



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disc key Once a player retrieves and decrypts the disc key from its slot in the key block, it can use the disc key to decrypt the title key stored in the sector header of each encrypted sector Each VTS on the disc uses a different title key The decrypted title key is used to decrypt the video or audio contents of sectors that are encrypted with the CSS stream cipher CSS Licensing and Compliance CSS-compliant computers are required to have the following:

Telecommunications can be networked to enhance a lifestyle Presently, telecommunications can include: Telephones Fax machines Computers Video exchanges Message recording Message retrieval Teleconferencing Multiple-line phone systems





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A CSS-licensed DVD-ROM drive with authentication hardware CSS-licensed decoding hardware/software, including an authenticator and decryptor CSS-licensed video components Regional management support Protection of digital output Protection of analog video output (other than RGB) Prevention against copying decrypted files Rejection of no copies allowed material on a recordable disc (may be provided by the drive or system)

Any computer industry segment involved in the production or integration of hardware or software components that are affected by CSS may be required to obtain a license and abide by its restrictions, as follows:

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