| 摘要 |
PROBLEM TO BE SOLVED: To enable the protection of benefit for the copyright holder further effectively as compared with the conventional manner regarding an optical disk device, an access method of the optical disk, and the optical disk, by applying this method for e.g. a mini-disk(MD), compact disk(CD), digital video recorder(DVR), etc., and recording/reproducing devices of them. SOLUTION: This device and the method are constituted so that signals of plural systems are produced in the manner of respectively disturbing each of bit strings b0-b3 of the information SA regarding the copyright by different binary number groups M1-M4, and a driving signal OUT of one system is produced in the manner of further disturbing the signals of these plural systems, then the laser beam is modulated. |
