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Encryption method, decryption method, and recording and reproducing apparatus

  • US 20020131595A1
  • Filed: 03/08/2002
  • Published: 09/19/2002
  • Est. Priority Date: 03/13/2001
  • Status: Active Grant
First Claim
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1. An encryption method for encrypting information including a plurality of continuous unit blocks having a reproduction order, said plurality of unit blocks being encrypted one unit block at a time, wherein a seed of an encryption key for encrypting a unit block is based on one or more unit blocks that are, in the reproduction order, before the unit block or on information generated by encrypting one or more unit blocks before the unit block.

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