CONFIDENTIAL INFORMATION TRANSMISSION DEVICE, CONFIDENTIAL INFORMATION TRANSMISSION METHOD, CONFIDENTIAL INFORMATION RECORDER, ELECTRONIC WATERMARK EMBEDDING DEVICE, AND ELECTRONIC WATERMARK EXTRACTION DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a confidential information transmission device, a confidential information decoder, an electronic watermark embedding device, and an electronic watermark extraction device which realize a simple method with a simple constitution. SOLUTION: The confidential information transmission device is provided with a PCR(program clock reference) generator 3 which generates a periodic PCR, a variable delay device 11 which modulates the period of the PCR in accordance with information to be concealed, and a transmission device which uses one stream to multiplex PCR packets into image data and transmits the PCR with the modulated period.