INFORMATION RECORDING DEVICE, INFORMATION REPRODUCING DEVICE, RECORDING MEDIUM MANUFACTURING DEVICE, INFORMATION RECORDING MEDIUM, METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an information recording processing structure achieving both a reading difficulty and highly accurate reading.

SOLUTION: Highly confidential additional information such as an encryption key is recorded in a groove signal. The groove signal having amplitude offset set according to a bit value is recorded during the recording of the additional information. During the reading of the additional information, a signal R0 having no offset is estimated from the reading signal R1 of the groove signal of a predetermined section, differential signal C=R1-RF0 is calculated to integrate differential signals for each predetermined section, and the amplitude offset direction of the groove signal of each section is discriminated. Such processing increases a reading difficulty and achieves recording/reproducing of the additional information achieving highly accurate reading.

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