Patent ID: 6581160
Filing Date: 2003-06-17
Classification: G06F,G11B

Abstract:
A storage medium that is used having been loaded into an electronic appliance, the storage medium comprising:a content storage area for storing a digital content; a revocation information storage area for storing, as revocation information, information that corresponds to identification information of an electronic appliance that is prohibited from accessing the digital content stored in the content storage area; a master revocation information storage area storing, as master revocation information, information that corresponds to identification information of an electronic appliance that is prohibited from updating the revocation information stored in the revocation information storage area; content protecting means for performing a first judgment as to whether an electronic appliance into which the storage medium has been loaded has identification information that corresponds to the revocation information stored in the revocation information storage region, and allowing the electronic appliance to access the digital content stored in the content storage region only if the first judgment is negative; and revocation information updating means for performing a second judgment as to whether the electronic appliance into which the storage medium has been loaded has identification information that corresponds to the master revocation information stored in the master revocation information storage region, and allowing the electronic appliance to update the revocation information stored in the revocation information storage region only if the second judgment is negative.