OPTICAL RECORDING MEDIUM, RECORDING METHOD OF OPTICAL RECORDING MEDIUM AND RECORDER, AND PLAYING-BACK METHOD OF OPTICAL RECORDING MEDIUM AND PLAYING-BACK DEVICE

摘要

PROBLEM TO BE SOLVED: To reliably read out additional data restricting the reproduction or the copy of main data without affecting the reading of the main data.;SOLUTION: A recording track consists of continuous lands, main data DA are recorded by forming a pit pattern on the recording track on the basis of the main data DA, and additional data Dsub are recorded by displacing, by a prescribed amount, the pit pattern P1 formed on the synchronizing signal recording area whereon the synchronizing signal for the main data is recorded to the direction orthogonal to the center line of the recording track in the track direction. The additional data Dsub are key data to decipher the enciphering process of the main data subjected to enciphering process, or are data including copyright data.;COPYRIGHT: (C)2002,JPO