Hologram printed on optical recording medium for copy protection

Details Hologram printed on optical recording medium for copy protection Hologram printed on optical recording medium for copy protection

1995-09-08

1996-12-24

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 84, 3692755, 369280, 3692866, 369DIG1, G11B 700

Patent

active

055879845

ABSTRACT:
An optical recording medium is disclosed, in which holograms for recording medium discrimination are recorded in a recording medium discrimination information recording area provided on the side of an inner circle within an information recording area on a compact disc. Thus, it is difficult to copy an original optical recording medium to produce a fake product, and it is possible to distinguish the original optical recording medium from the fake product by external appearance.

REFERENCES:
patent: 5091965 (1992-02-01), Kobayashi et al.
patent: 5453968 (1995-09-01), Veldhuis et al.
patent: 5513260 (1996-04-01), Ryan

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