METHOD OF PREVENTING COPYING OF CODE INFORMATION, CODING EQUIPMENT AND DECODING EQUIPMENT AS WELL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To attain the compatibility of copyright protection with the convenience of a user when copying digital signals. SOLUTION: The high-quality digital signals subjected to analog-to-digital conversion with 24 bits is subjected to digital-to-analog conversion by a digital- to-analog converter 45 and the analog signals are outputted through an output terminal 55. The high-quality digital signals are added with copyright data relating to their data and are outputted through a digital output terminal 90.