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Method and system for encryption/decryption of scalable video bitstream for conditional access control based on multidimensional scalability in scalable video coding

  • US 20070116277A1
  • Filed: 11/17/2006
  • Published: 05/24/2007
  • Est. Priority Date: 11/17/2005
  • Status: Active Grant
First Claim
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1. A scalable video bitstream encryption/decryption system, comprising:

  • a scalable video coding (SVC) bitstream encryption section for encrypting a scalable video bitstream;

    a bitstream extraction unit for extracting network abstraction layer (NAL) data of a specific scalability from the SVC bitstream; and

    an SVC bitstream decryption section for decrypting the scalable video bitstream transmitted from the SVC bitstream encryption section, the SVC bitstrearn encryption section comprising;

    an SVC bitstream creation unit for creating NAL data and headers of the NAL data according to preset scalabilities by using an input video signal, and creating an SVC bitstream including the NAL data and the NAL headers;

    a NAL data identification unit for identifying NAL data to be encrypted from the NAL data included in the SVC bitstream, and extracting scalability information from the NAL data to be encrypted;

    a key input unit for outputting an encryption key corresponding to the scalability information; and

    a data encryption unit for encrypting NAL data having scalability information equal to the extracted scalability information based on an SVC syntax by using the encryption key.

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