| 摘要 |
PROBLEM TO BE SOLVED: To realize an optical recording medium excellent in a secrecy keeping characteristic and also to enable reproducing of recorded information even after a quick erasing is performed by making a data area to be in a pre-written state and a file information area to be in an unrecorded state. SOLUTION: When the intrinsic receiver of information reproduces information, the receiver finalizes an optical recording medium 10 by using a commercial CD writer. The reproducing of the recording information is made possible by allowing the CD writer to read out PMA information recorded in a RMA 13 and to write TOC information in a TOC area 15 in accorance with its contents and, at the same time, to write a readout in 'a readout area'. Thereafter, the information are reproduced with the CD write as they are or are reproduced with an ordinary CD player or a CD-ROM drive. When an optical recording medium 10 whose TOC area is in a unwritten state and in whose program area 17 information are recorded is delivered to other person, the person can not reproduce the information by using the commercial CD player or the CD-ROM driver. |
