| 摘要 |
<p>A DVD-R (1) has a main information area (2) where data is recorded in a track having a wobble and first and second control data areas (3, 15) disposed in the inner space closer to the center than the main area (2). The information structure and physical structrue of the first control area (3) are different from those of the second control area (15). In the second control area (15), predetermined physical format information and disk production information, for example, the last address of when data is written in the DVD-R (1) and the maximum transfer rate are recorded; and in the first control area (3), physical format information, disk production information, and key information for decyphering cyphered main information. Thus, even when data recorded on such a DVD-R (1) is reproduced by a DVD reproducing apparatus, control data is read to identify the disk and to prevent illegal use of the optical disk leading up to breach of the copy right.</p> |
