Optical recording medium and the reproducing apparatus for the o

Details Optical recording medium and the reproducing apparatus for the o Optical recording medium and the reproducing apparatus for the o

1994-06-28

1996-07-23

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428913, 4302701, 4304951, 430945, 369272, 369273, 3692751, 3692754, 3692755, 369277, B32B 300

Patent

active

055387730

ABSTRACT:
The present invention discloses an optical recording medium having copy protection measures, production method thereof and a reproducing apparatus therefor. The optical disc comprises a data recording area recorded with ciphered digital signals and a cipher key information recording area provided other than the data recording area in the optical recording medium for recording cipher key information to determine a deciphering method of the ciphered digital signals. The cipher key information is provided along a peripheral edge surface which is outside the surface of the optical recording medium in a serrated pattern, perpendicular to the surface having the recording layer. The serrated pattern is formed by an injection molding machine using a metal mold having an injection molding member provided with a serrated negative pattern in accordance with the recording cipher key information to be recorded. The ciphered digital signals and the cipher key information are respectively read out from the optical recording medium by a reproducing device and the ciphered digital signals obtained are deciphered by a deciphering device using the cipher key information obtained.

REFERENCES:
patent: 5274623 (1993-12-01), Usami
IEC 908:1987 International Electrotechnical Commission, 1st edition and Amendment I.

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