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Storage Medium Processing Method, Storage Medium Processing Device, and Program

  • US 20070248231A1
  • Filed: 06/08/2005
  • Published: 10/25/2007
  • Est. Priority Date: 07/08/2004
  • Status: Active Grant
First Claim
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1. A storage medium processing method a using a storage medium and a user terminal, wherein the storage medium stores medium identifier data, medium unique key data enabled to be generated based on the medium identifier data, encrypted user key data in which user key data is encrypted so that it may be decrypted using the medium unique key data, and encrypted content key data in which content key data is encrypted so that it may be decrypted using the user key data, the user terminal retains encrypted content data in which content data is encrypted so that it may be decrypted using the content key data, and the user terminal connected to the storage medium is enabled to access to a license center to obtain various kinds of data, the method comprising:

  • an issuance step issuing the content key data and the user key data with management data including data of an expiration date of the content key data or the user key data in order to permit the user to use the content data before a certain expiration date in response to request from the user terminal, a judgment step judging whether or not the user key data or the content key data may be used continuously referring to the management data; and

    deleting/use-precluding step deleting or preclude using of the user key data or the content key data based on the judgment result of the judgment step.

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