COPY MANAGEMENT METHOD, COPY MANAGEMENT DEVICE, RECORDING MEDIUM AND PROGRAM

摘要

PURPOSE: To provide a copy management method or the like that can eliminate a problem due to a detection delay of control information. CONSTITUTION: The copy management method manages copying by embedding an electronic watermark denoting control information with respect to contents 1 and 2 comprising digital information, and electronic watermarks 1a, 2a include change position information denoting a change position of contents of the control information.