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Data structure of multimedia file format, encrypting method and device thereof, and decrypting method and device thereof

  • US 9,729,828 B2
  • Filed: 07/15/2013
  • Issued: 08/08/2017
  • Est. Priority Date: 03/29/2002
  • Status: Expired due to Term
First Claim
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1. A method of reproducing a multimedia file including attribution information and a sequential array of chunks, each of the chunks being equivalent to one or more encoded audio frames and/or encoded video frames, the encoded audio frames and the encoded video frames being encrypted for a chunk, the method comprising:

  • decrypting the multimedia file, which comprises;

    obtaining chunk offset information from the attribution information in the multimedia file, wherein the chunk offset information indicates respective start positions of the chunks from a head of the file;

    referring to one of the start position of the chunks;

    extracting one of the chunks from the multimedia file based on the one of the start positions of the chunks; and

    decrypting, for the chunk, the encrypted audio frames and/or encrypted video frames in the extracted chunk into the encrypted audio frames and/or the encoded video frames after extracting the one of the chunks based on the one of the start positions of the chunks, and successively outputting the encoded audio frames and the encoded video frames;

    decoding an audio stream extracted from the encoded audio frames into an audio signal and a video stream extracted from the encoded video frames into a video signal; and

    outputting the audio signal and the video signal.

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