When digital image signals inputted through an inputting terminal are
recorded on a disc, a medium-related information (a serial number in an
TOC) of the disc, read from the disc, with a medium-related information
reading section is spectrum-spread in an SS additional information
generating section and then digital image signals S2 on which the
spectrum-spread medium-related information is superimposed in an SS
additional information superimposing section are recorded on the disc.
When the signals attempt to be reproduced, the reproduction can be
performed in the case wherein the medium-related information superimposed
on the image signals recorded on the disc is consistent with the
medium-related information of the disc on which the image signals are
recorded. Thus, copying of the information signals can be limited to the
copying for private use.