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Multi-level, multi-dimensional content protections

  • US 20030002668A1
  • Filed: 06/30/2001
  • Published: 01/02/2003
  • Est. Priority Date: 06/30/2001
  • Status: Abandoned Application
First Claim
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1. A method comprising:

  • receiving content comprising a set of attributes having L through N levels of access, where L<

    N, and content at a given level of access being decryptable by a corresponding key;

    receiving a base key corresponding to an M of N level of access, where LMN; and

    deriving lower level keys based on the base key, the lower level keys being used to access content having an M level of access or lower.

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