A simplified method is provided for recording identification information,
such as a serial number or the like, in a hologram-recorded film
simultaneously with hologram duplication. The method includes the steps
of coupling a hologram recording film with a master hologram plate having
a master hologram, the master hologram plate having a reflective area
adjacent the master hologram; and directing laser beams towards the
master hologram plate to induce interference between incident laser light
and diffraction laser light from the master hologram in the recording
film, at least some of the laser beams radiating the reflective area
through a transmission type controllable display device to record a
pattern in the hologram recording film corresponding to a pattern
displayed at the transmission type controllable display device.