| 摘要 |
PROBLEM TO BE SOLVED: To make an illegal copy effectively avoidable by applying to an optical disk recording e.g. a high tone quality digital audio signal, its optical disk forming device, a reproducing device related to an optical disk recorder, concerning an optical disk recording method, an optical disk, an optical disk reproducing device and an optical disk reproducing method. SOLUTION: A sub-data line is formed by the key data DK required for decoding a main data line D1 and the data SID specifying a processing form of decoding, and this sub-data line is recorded by locally changing a width of a pit, etc., at the timing not affecting positional information of an edge detected at a reproducing time. Further, related to the data recording by longitudinal directional modulation of a mark and a space, the key data of the data are recorded by the latitudinal directional modulation of the mark or the space. |
