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Copy protection for recorded media

  • US 5,923,754 A
  • Filed: 05/02/1997
  • Issued: 07/13/1999
  • Est. Priority Date: 05/02/1997
  • Status: Expired due to Term
First Claim
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1. A method of securely transferring a disk key and a media key, from a media storage to an output device in a computer system, the output device having an output device key associated therewith, said method comprising the steps of:

  • generating a first random secure transfer key with a uniqueness factor derived from phase lock loop circuitry;

    forming a second secure transfer key by combining the secure transfer first key with the output device key;

    forming a third secure transfer key by using the second secure transfer key to encrypt the disk key and the media key; and

    transferring the third secure transfer key to the output device.

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  • 4 Assignments
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