An information reproduction system that provides an apparatus for
reproducing audio/video information from an information recording medium
having a tape form for example and circumventing problems associated with
illegal copies of information recording media. If a match is found
between the contents of identification data information read from a
memory fixed to a cassette incorporating a magnetic tape and the contents
of individual key data information stored in an information storage
memory, a controller causes an information reproducing block to reproduce
main information from the magnetic tape.