Data copyright management

  • US 8,407,782 B2
  • Filed: 03/26/2002
  • Issued: 03/26/2013
  • Est. Priority Date: 10/27/1994
  • Status: Expired due to Fees
First Claim
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1. A method performed by a first computing device, the method comprising:

  • receiving an encrypted version of a first set of protected digital data;

    receiving a first crypt key specifically associated with the first set of protected digital data;

    decrypting the encrypted version of the first set of protected digital data using the first crypt key to produce decrypted digital data;

    managing forms of usage of the first set of protected digital data, wherein said managing includes, for a first form of usage requested by a user of the first computing device;

    when the first form of usage is one of a first set of usages, permitting the first form of usage using the decrypted digital data; and

    when the first form of usage is one of a second set of usages distinct from usages in the first set, permitting the first form of usage on a re-encrypted version of the decrypted digital data generated by re-encrypting the decrypted digital data using a second crypt key.

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