An information recording medium includes a lead-in area and a data area for
storing contents information. The lead-in area includes a first lead-in
information area and a second lead-in information area. The first lead-in
information area corresponds to a first playback mode. The second lead-in
information area corresponds to a second playback mode different from the
first playback mode. The first lead-in information area has a first depth
and is designed for storing lead-in information related to the contents
information stored in the data area. The second lead-in information area
includes pre-pits having a second depth greater than the first depth. The
pre-pits represent predetermined information, such as information of
copyright protection, related to the contents information stored in the
data area.
