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Multiple content protection systems in a file

  • US 10,229,248 B2
  • Filed: 11/26/2014
  • Issued: 03/12/2019
  • Est. Priority Date: 01/21/2009
  • Status: Active Grant
First Claim
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1. A system for extending a media file format to support multiple protection systems in a single container file, said system comprising:

  • a memory area for storing a file containing content and one or more encryption expressions, said content being encrypted by the one or more encryption expressions, said content further having a first protection system and a second protection system applied thereto, the first protection system defining a first protection system header box and the second protection system defining a second protection system header box, said file including the first protection system header box storing one or more data objects used to decrypt encrypted content for the first protection system and said file including a second protection system header box storing one or more data objects used to decrypt encrypted content for the second protection system; and

    a computing device comprising a processor programmed to;

    receive the file;

    determine that the first protection system is supported by the computing device;

    based on the determining, select, from the first and second protection systems, the first protection system header box;

    obtain, from the one or more data objects stored in the first protection system header box, license information for the first protection system;

    decode the content based on the obtained license information and the one or more encryption expressions; and

    present the decoded content to a user.

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