DVD on Computers by Jim Taylor

By Jim Taylor

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If the encrypted content is viewed on a display device without decryption, it appears as random noise. If a display device is compromised and its secret keys are exposed, the licensing administrator places the device’s KSV on a key-revocation list, which is carried by system renewability messages (SRMs). The computer updates its key-revocation list whenever it receives a new SRM, which can come from prerecorded or broadcast sources, or from a connected device. Region Management Details Before 2000, regional management was handled independent of the drive and most DVD-ROM drives had no built-in region code.

This is an industry notorious for its lack of regard for regulations and artificial barriers. Computer software developers long ago gave up the fight for copy-protected software because it did little to slow down those determined to make copies. However, it sorely inconvenienced honest users who were unable to make legal backup copies or had problems simply installing or uninstalling the software they had purchased. Microsoft, for instance, loses billions of dollars to illegal software copying, yet it still makes plenty of money.

2). 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.

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