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Apparatus and method for preventing unauthorized use of information recorded on an information recording medium

  • US 6,289,102 B1
  • Filed: 10/01/1997
  • Issued: 09/11/2001
  • Est. Priority Date: 10/09/1995
  • Status: Expired due to Term
First Claim
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1. An information recording medium comprising a lead-in area not accessible by devices other than a disk reproducing device and a data recording area, whereinkey information is recorded in the lead-in area, scrambled data is recorded in the data recording area, and the scrambled data is descrambled based on the key information.

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