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Recording and playback apparatus for stream data and transmission method for stream data

  • US 20020114462A1
  • Filed: 12/10/2001
  • Published: 08/22/2002
  • Est. Priority Date: 02/16/2001
  • Status: Active Grant
First Claim
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1. A stream data recording and playback apparatus comprising:

  • interface means for transmitting and receiving stream data and data for control;

    a built-in or removable recording medium for recording received data;

    encrypting means for performing a scramble process of data to be transmitted; and

    decrypting means for performing a de-scramble process of the received data, whereby key information for the scramble process or de-scramble process is interchanged by performing, through said interface means, an authentication process between the present apparatus and another apparatus for transmission or reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with the information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, wherein when the data de-scrambled by said decrypting means and thereafter recorded on said recording medium is read, scrambled by said encrypting means and transmitted as stream data from said interface means, the copy control information added to said stream data to be transmitted is changed depending on whether said data remains to be kept on said recording medium even after said data is read out or said data is deleted from said recording medium after said data is read out.

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