MODULATION METHOD, MODULATOR, DEMODULATION METHOD, DEMODULATOR, RECORDING MEDIUM, TRANSMISSION, AND TRANSMISSION METHOD

摘要

PROBLEM TO BE SOLVED: To enable high-density recoding by improving a coding rate to record a signal which cannot be falsified as a result of making a signal into a signal which cannot be directly outputted to a recording signal as data, and thereby to realize the prevention of a illegal copy or the like. SOLUTION: The restriction of a value of k is enabled from the outside by using the 8-15 modulation of an RLL (2, k) restriction. Thereby, auxiliary information can be recorded as a watermark generated by the modulation by superimposing the auxiliary information to main information.