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Content protection system

  • US 20030041262A1
  • Filed: 08/22/2002
  • Published: 02/27/2003
  • Est. Priority Date: 08/23/2001
  • Status: Abandoned Application
First Claim
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1. A content protection system for content distributing servers for accumulating contents to be transmitted in response to requests for use, comprising:

  • at least one content distributing server including a user equipment authenticator for referring to an open key certificate of user equipment making a request for use to authenticate the user equipment, an electronic watermark processor for inserting electronic watermarks into the contents, and a transmitter for transmitting the contents;

    a check server including a first content distributing server authenticator for authenticating the content distributing server based on an open key certificate for authenticating the content distributing server, and determination unit for checking the contents held in said content distributing server;

    an authentication organization server including an issuing unit for issuing the open key certificate for authenticating the user equipment and the open key certificate for authenticating the content distributing server, and a rescission list indicating rescinded open key certificates, and a renewing unit for renewing the rescission list on the basis of a notification from the check server; and

    at least one user equipment including a second content distributing server authenticator for referring to an open key certificate for authenticating the content distributing server to authenticate the content distributing server, and an executor for executing content received from the content distributing server.

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