Information signal duplication control system

A detecting device for detecting a code superimposed on the main information signal from a combined signal, the device comprising:

• code detection means for receiving said combined signal and detecting said code from the combined information signal using a prescribed plurality of different codes each corresponding to a single control code for controlling output of said main information signal;
• and
• controlling means for controlling the output of said main information signal based on said code detected by the code detection means and said control code corresponding thereto.

A superimposing method for superimposing a control signal on a main information signal and generating a combined signal, the superimposing method comprising the steps of:

• generating selectively one of a prescribed plurality of different codes which are the same codes as a plurality of different codes generated by a detector and where each code of the prescribed plurality of codes corresponds to a single control for controlling output of said main information signal;
• and
• superimposing said generated code on the main information signal to generate the combined signal.

A detecting method for detecting a code superimposed on a main information signal from a combined signal, the method comprising the steps of:

• receiving said combined signal and detecting said code from the combined information signal using a prescribed plurality of different codes where each code of said prescribed plurality of codes corresponds to a single code used for controlling output of said main information signal;
• and
• controlling the output of said main information signal based on said code detected by the step of receiving and detecting and the code corresponding thereto.