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Revocation information updating method, revocation information updating apparatus and storage medium

  • US 20050154880A1
  • Filed: 12/13/2004
  • Published: 07/14/2005
  • Est. Priority Date: 11/08/1999
  • Status: Active Grant
First Claim
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1. A revocation information updating method for updating revocation information on a storage medium, the storage medium (1) being capable of recording and playing back a digital content when used by an electronic appliance having at least one of a function for playing back a digital content and a function for recording a digital content and (2) storing, in advance, revocation information that is used to judge which electronic apparatuses should be prevented from using the storage medium in order to protect digital contents, the revocation information updating method comprising:

  • (a) a recording step for recording master revocation information, which is judgeable by revocation information updating apparatuses, in advance into a special storage region provided on the storage medium;

    (b) a determining step for determining, based on the master revocation information, whether the revocation information on the storage medium can be updated by a revocation information updating apparatus into which the storage medium has been inserted;

    (c) an updating step for updating the revocation information, depending on a determination made in the determining step.

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