| 摘要 |
PROBLEM TO BE SOLVED: To enable multiplex data to be displayed only by a decoding reproducing system sold and installed only in a specific area, where a recording medium for the multiplex data has been sold or where the multiplex data has been broadcast. SOLUTION: Multiplex data containing an area code is recorded in a recording medium 20; this area code is compared with an internal area code in a decoding device 30; and, when the area code of the recording medium 20 contains the internal area code of the decoding device 30, the recording medium 20 is decoded and reproduced. In addition, acceptance period data are written in the multiplex data in accordance with the area code; this acceptance period is compared with the date of a calendar generator 38 in the decoding device 30; and, if the date of the calendar generator 38 is within the acceptance period, the recording medium 20 is decoded and reproduced. |
