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Secure communication and real-time watermarking using mutating identifiers

  • US 20050010536A1
  • Filed: 05/26/2004
  • Published: 01/13/2005
  • Est. Priority Date: 02/27/2002
  • Status: Active Grant
First Claim
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1. A method of distributing a content item by a content provider having a first mutating identifier, the method comprising:

  • assigning the content item a first label by a function;

    creating a request for a key by encrypting the first label with the first mutating identifier;

    sending the encrypted request to an authenticator;

    receiving a key for the first label and a second mutating identifier from the authenticator;

    encrypting the first label with the second mutating identifier;

    encrypting the content item with the received key;

    sending the encrypted first label to a consumer with an identity and a third mutating identifier;

    creating a request for decryption by the consumer by encrypting the received encrypted first label with the third mutating identifier;

    sending the request for decryption to the authenticator;

    receiving a decryption key and a fourth mutating identifier from the authenticator; and

    receiving the encrypted content item from the content provider.

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