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Content management system and information recording medium

  • US 20040117309A1
  • Filed: 09/12/2003
  • Published: 06/17/2004
  • Est. Priority Date: 07/09/2001
  • Status: Abandoned Application
First Claim
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1. (Amended) A content management system in which content data recorded on a portable-type recording medium is used by a content use terminal, comprising:

  • the content use terminal;

    a recording medium removably inserted to the content use terminal; and

    a management server communicable with the content use terminal, the recording medium including;

    a content data recording section which records encrypted content data;

    a medium-side authenticating section which performs authentication with the content use terminal; and

    a protected area which records therein protected information of which reading from outside is restricted, the protected information including use restriction information indicative of conditions for using the encrypted content data and key information for decoding the encrypted content data, and the content use terminal including;

    a terminal-side authenticating section which performs mutual authentication with the recording medium in cooperation with the medium-side authenticating section;

    a protected information reading section which reads the protected information from the protected area of the recording medium only upon a success of the mutual authentication performed by the terminal-side authenticating section with the recording medium;

    a use deciding section which decides, based on the use restriction information included in the protected information read by the protected information reading section, whether or not the content data recorded on the recording medium is usable;

    a content decoding section which decodes, upon a decision made by the use deciding section that the content data recorded on the recording medium is usable, the content data encrypted and recorded on the recording medium by using the key information included in the protected information read by the protected information reading section; and

    a content executing section which executes the content data decoded by the content decoding section, wherein the management server transmits, to the content use terminal, use restriction update information for updating the use restriction information, the terminal-side authenticating section performs mutual authentication with the recording medium upon a receipt of the use restriction update information from the management server, and the content use terminal further includes;

    an updating section which updates, in accordance with the use restriction information transmitted from the management server, the use restriction information recorded in the protected area of the recording medium only upon success of the mutual authentication performed by the terminal-side authenticating section with the recording medium;

    a use restriction update information storage section which stores the use restriction update information transmitted from the management server; and

    a use restriction information deciding section which makes a decision whether or not the protected information recorded on the recording medium includes use restriction information corresponding to the use restriction update information stored in the use restriction update information storage section, the decision being made only upon a success of the mutual authentication performed by the terminal-side authenticating section with the recording medium, upon new insertion of a recording medium, the terminal-side authenticating section performs mutual authentication with the newly-inserted recording medium, and upon a decision made by the use restriction information deciding section that the use restriction information corresponding to the use restriction update information stored in the use restriction update information storage section is included, the updating section updates the use restriction information recorded on the recording medium in accordance with the use restriction update information stored in the use restriction update information storage section.

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