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Seamless switching between multiple pre-encrypted video files

  • US 7,317,797 B2
  • Filed: 06/06/2003
  • Issued: 01/08/2008
  • Est. Priority Date: 06/07/2002
  • Status: Active Grant
First Claim
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1. A method for pre-encrypting video on demand (VOD) content which includes a first video file and at least one second video file, comprising:

  • encrypting the first video file using a fixed key having a first parity alternating with a dynamic key having a second parity opposite the first parity; and

    encrypting the at least one second video file using a fixed key having a fixed parity.

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