Hologram printed on optical recording medium for copy protection
AssigneeSony Corporation
InventorsHideo Owa, Seiji Kobayashi
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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.
Claims17
An optical recording medium having signals optically recorded therein, the optical recording medium comprising a hologram for recording medium discrimination recorded in an area other than an information recording area in which information signals are recorded.
A signal recording method for recording signals in an optical recording medium, the method comprising:
- a first step of receiving information signals to be recorded in the optical recording medium;
- a second step of receiving a hologram for discriminating the optical recording medium;
- a third step of recording the information signal in an information recording area of the optical recording medium;
- and
- a fourth step of recording the hologram in an area other than the information recording area.
Dependencies are inferred from the claim text.