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

  • US 7,392,225 B2
  • Filed: 12/13/2004
  • Issued: 06/24/2008
  • Est. Priority Date: 11/08/1999
  • Status: Expired due to Fees
First Claim
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1. A storage device that is 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, operative with a revocation information updating apparatus, the storage device comprising:

  • a special storage region in which one or more sets of revocation information for identifying electronic appliances that are invalidated from accessing the storage device and master revocation information for identifying revocation information updating apparatuses that have special permission to update the revocation information are recorded in advance;

    a judging means for judging, when the storage device is loaded into the revocation information updating apparatus, whether the revocation information updating apparatus is permitted to update the revocation information present on the storage device, based on the master revocation information;

    an updating means for updating the revocation information, depending on the judgment made by the judging means.

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