DIGITAL COPY PREVENTING PROCESSING UNIT, REPRODUCIBLE RECORDING MEDIUM RECORDING DIGITAL DATA PROCESSED BY THE SAME, DIGITAL COPY PREVENTING PROCESSING METHOD, COMPUTER READABLE RECORDING MEDIUM RECORDING PROGRAM FOR COMPUTER TO EXECUTE THE SAME METHOD AND REPRODUCIBLE RECORDING MEDIUM RECORDING DIGITAL DATA PROCESSED BY THE SAME METHOD

摘要

PROBLEM TO BE SOLVED: To physically limit the illegal copy of digital contents such as music, image and program and to effectively limit the utilization of the copied contents.;SOLUTION: This unit is provided with a guard data storage part 25 storing guard data, which are added to the digital data of audio or image, to recognize the existence thereof only at the time of reproducing after the digital data are compressed, a data analytic part 22 for specifying the position of a digital value, which has a prescribed increase rate and a prescribed size, in the digital data as a peak position, setting a flag to a digital value, which is located separately from that peak position for a prescribed number, and setting plural digital values over the digital value, to which the relevant flag is set, for a prescribed number as a data pattern, and a guard data adding processing part 23 for deforming the digital data by adding the guard data at a position, where the data pattern is located.;COPYRIGHT: (C)2001,JPO