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Information management system having a common management server for establishing secure communication among groups formed out of a plurality of terminals

  • US 7,451,202 B2
  • Filed: 12/18/2003
  • Issued: 11/11/2008
  • Est. Priority Date: 12/20/2002
  • Status: Active Grant
First Claim
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1. An information management system comprising:

  • a terminal apparatus; and

    an information management server configured to permit a predetermined number of terminal apparatuses to receive content therefrom and configured to manage a plurality of terminal apparatuses permitted to receive the content, the terminal apparatuses permitted to receive the content being managed as a group of terminal apparatuses associated with the information management server,wherein the information management server includes;

    a management information storage unit configured to store a list indicating terminal information identifying a registered terminal apparatus, the information management server permitting the registered terminal apparatus to receive the content from the information management server;

    a judging unit configured to judge whether or not a number of registered terminal apparatuses, concurrently permitted by the information management server to receive the content from the information management server, exceeds the predetermined number of terminal apparatuses, the judging unit performing the judgment when the information management server receives, from the terminal apparatus of the information management system, a request for registration that identifies the registered terminal apparatus identified in the list stored in the management information storage unit; and

    a first secure communication unit configured to establish a secure communication channel with the terminal apparatus of the information management system and configured to transmit, to the terminal apparatus of the information management system via the secure communication channel, group information identifying the group of terminal apparatuses associated with the information management server, the first secure communication unit performing the establishing and the transmitting when the judging unit judges that the number of registered terminal apparatuses currently permitted by the information management server to receive the content from the information management server does not exceed the predetermined number of terminal apparatuses,wherein the terminal apparatus of the information management system includes a tamper-resistant module, andwherein the tamper-resistant module includes;

    a data storage unit configured to securely store the group information transmitted from the first secure communication unit; and

    a second secure communication unit configured to, when the terminal apparatus of the information management system leaves the group of terminal apparatuses associated with the information management server, establish a secure communication channel with the first secure communication unit and transmit, to the information management server via the secure communication channel established between the first secure communication unit and the second secure communication unit by the second secure communication unit, a request for deleting the terminal information identifying the registered terminal apparatus, which left the group of terminal apparatuses, from the list stored in the management information storage unit.

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