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Method for encrypting content, and method and apparatus for decrypting encrypted data

  • US 20040076296A1
  • Filed: 09/22/2003
  • Published: 04/22/2004
  • Est. Priority Date: 10/21/2002
  • Status: Abandoned Application
First Claim
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1. A terminal apparatus for decrypting encrypted data including content, comprising:

  • providing part configure to providing terminal-side item information;

    a first memory part configured to receive and store operational rule information corresponding to a combination of title key and reproduction object inherent information, the title key being uniquely determined in accordance with the content, and the reproduction object inherent information restricting a reproduction object of content and including item information;

    a second memory part configured to receive and store the encrypted content data encrypted based to on encryption key information generated from the title key and the reproduction object inherent information;

    a decryption key generation unit configured to compare the item information with the terminal-side item information to judge a reproduction possibility of the encrypted content data, and generate a decryption key from the item information and the title key in accordance with the judgment, the item information being acquired from the operational rule information; and

    a decryption unit configured to decrypt the content data based on the decryption key information.

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