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Information recording medium, information recording device, information reproduction device, information delivery device, their methods, their programs, and recording medium recording programs thereon

  • US 20050273618A1
  • Filed: 08/27/2003
  • Published: 12/08/2005
  • Est. Priority Date: 09/11/2002
  • Status: Abandoned Application
First Claim
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1. An information recording medium recording contents encrypted using a content encryption key, and a content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption key, wherein the encryption key for decryption key is different for each of the regions preset for at least controlling the permission and inhibition of playback of the contents, the content encryption key and the content decryption key are established corresponding to each of the regions where the content playback is permitted, or corresponding to the combination of the regions where content playback is permitted.

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