Information output device, information recording device, and information duplication control system

摘要

The invention intends to secure the control of duplicating information signals. In the duplication control method according to the invention, a main information signal containing a duplication control information transformed into a spread spectrum signal to be superimposed (15-19) and a duplication control information superimposed by a processing different from the spectrum spreading (13) is transmitted. The duplication control information transformed into a spread spectrum signal is extracted from the main information signal by the reverse spectrum spreading (25), and the duplication control information superimposed by the different processing is extracted from the main information signal (24). One information most closest to duplication prohibition is selected as an output duplication control information out of the plural extracted duplication control information (27). On the basis of the selected output duplication control information, the main information signal is controlled on duplication (23).