JP2008312257A5 - - Google Patents

Claims (3)

  Reproducing means for reproducing the digital information and the first copy restriction information recorded on the recording medium;
  First determining means for determining the first copy restriction information reproduced from the recording medium;
Encryption means for encrypting the digital information reproduced from the recording medium according to the first copy restriction information determined by the first determination means;
Output means for outputting the digital information encrypted by the encryption means together with second copy restriction information generated according to the first copy restriction information;
With
  When outputting the digital information reproduced from the recording medium from the output means,
  If the first copy restriction information indicates that copying is permitted without limitation, it is determined that the digital information is not encrypted, and the reproduced digital information is not encrypted by the encryption means. Output from the output means together with second copy restriction information indicating that copying is permitted without limitation,
  When the first copy restriction information indicates prohibition of copying, it is determined that the digital information is encrypted, the digital information is encrypted by the encryption unit, and the digital information is encrypted by the encryption unit. A digital information reproducing apparatus for outputting digital information from said output means together with second copy restriction information indicating prohibition of copying. Play back the digital information and the first copy restriction information recorded on the recording medium,
When outputting the digital information reproduced from the recording medium,
If the first copy restriction information indicates that unlimited copying is permitted, it is determined that the digital information is not encrypted, the digital information is not encrypted, and the reproduced digital information is unlimited. With the second copy restriction information indicating that copying is permitted,
If the first copy restriction information indicates prohibition of copying, it is determined that the digital information is to be encrypted, the digital information is encrypted, and the encrypted digital information is indicated as prohibition of copying. A digital information reproducing method characterized in that it is output together with copy restriction information.   First digital information;
  Prohibition of duplication of the first digital information, only once allowed, unlimited allowed
Enter information and
  A cipher that inputs the first digital information, encrypts it, and outputs the second digital information
Conversion means;
  Copy restriction information determining means for inputting and determining the copy restriction information;
  Depending on the output of the copy restriction information discriminating means, the first digital information or the second digital information
Switching means for selecting and outputting digital information,
  Determined by the copy restriction information judging means that the copy restriction information indicates unlimited permission.
If so, the switching means is selected to output the first digital information.
Shime,
  The copy restriction information discriminating means determines that the copy restriction information indicates that copying is prohibited or once
If it is determined that only the second digital information is acceptable, the switching means outputs the second digital information.
A digital information input / output device characterized in that it is selected so as to be applied.