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Reduced size key allocation descriptors

  • US 10,616,190 B2
  • Filed: 05/18/2016
  • Issued: 04/07/2020
  • Est. Priority Date: 05/18/2016
  • Status: Active Grant
First Claim
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1. A method for key allocation in a broadcast encryption scheme, the method comprising:

  • receiving a descriptor selected from a plurality of descriptors, the descriptor comprising a plurality of subset definitions and a plurality of pointers, wherein each subset definition defines a subset difference tree of a broadcast encryption scheme, and wherein each of the plurality of pointers identifies a location in a predetermined table,the predetermined table being shared among the plurality of descriptors,wherein a total size of the plurality of descriptors is reduced by substituting the plurality of pointers for variant data in the descriptors;

    from each of the plurality of pointers, resolving a data segment in the predetermined table;

    assembling the resolved data segments into a plurality of variant definitions; and

    generating a media key block from the plurality of subset definitions and the plurality of variant definitions.

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