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Content usage-right management system and management method

  • US 7,496,756 B2
  • Filed: 08/15/2002
  • Issued: 02/24/2009
  • Est. Priority Date: 09/11/2001
  • Status: Expired due to Fees
First Claim
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1. A content usage-right management system comprising:

  • a user device that utilizes content; and

    a service provider that distributes to said user device a content usage-right certificate in which content-usage condition information is stored, wherein;

    said user device is configured to utilize the content according to the content-usage condition information stored in the content usage-right certificate received from said service provider and to make a request to change the content-usage condition information stored in the content usage-right certificate by sending the content usage-right certificate to said service provider, whereinsaid service provider is configured to generate, upon receiving the content usage-right certificate involving the request to change the content-usage condition information from said user device, an upgraded content usage-right certificate by changing the content-usage condition information recorded in the received content usage-right certificate and to send the upgraded content usage-right certificate to said user device,the content-usage condition information stored in the content usage-right certificate include usage condition information in which one of on-line usage that requires a determination of usage rights in said service provider and off-line usage that does not require a determination of usage rights in said service provider is set, andsaid service provider is configured to generate, upon receiving the content usage-right certificate involving the request to change the content-usage condition information from said user device, an upgraded content usage-right certificate by changing the usage-condition information between on-line usage and off-line usage for changing the content-usage condition information recorded in the received content usage-right certificate and to send the upgraded content usage-right certificate to said user device.

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