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Information recording/playback apparatus and method

  • US 7,181,624 B2
  • Filed: 04/04/2001
  • Issued: 02/20/2007
  • Est. Priority Date: 04/04/2000
  • Status: Expired due to Term
First Claim
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1. An information recorder for recording information to a recording medium, the apparatus comprising:

  • a transport stream processing means for appending an arrival time stamp (ATS) to each of discrete transport packets included in a transport stream; and

    a cryptography means for generating a block key for encrypting a block data including more than one transport packet each having the appended arrival time stamp (ATS) from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS), and encrypting each block data with the block key thus generated;

    the data encrypted by the cryptography means being recorded to the recording medium; and

    wherein the cryptography means generates a title-unique key from a key stored in the information recorder, disk ID and a title key unique to data to be recorded to the recording medium, andgenerates the block key from the title-unique key and block seed.

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