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.
An optical recording medium comprising: 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 and recorded with cipher key information which determines a deciphering method of the ciphered digital signals recorded on the data recording area, the cipher key information being provided along outside surface of the medium perpendicular to the surface having the recording layer of the optical recording medium.
Claim 2
Dependent Claim
80 words
An optical recording medium comprising: 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 and recorded with cipher key information which determines a deciphering method of the ciphered digital signals recorded on the data recording area, the cipher key information being provided along outside surface of the medium perpendicular to the surface having the recording layer of the optical recording medium.
Claim 3
Dependent Claim
56 words
An optical recording medium as claimed in claim 1, wherein the cipher key information is formed in a serrated pattern having a plurality of notches and ridges, and a difference of a height from each of bottoms of the notches to each of tops of the ridges is limited less than or equal to 300 μm.
Claim 4
Dependent Claim
164 words
A reproducing apparatus for reading out an original data from an optical disc having a data recording area recorded with ciphered digital signals and a cipher key information area recorded with cipher key information, the cipher key information being formed at outside surface of the medium perpendicular to the surface having the recording layer of the optical disc, outside surface of the medium perpendicular to the surface having the recording layer being formed other than the data recording area of the optical disc, the reproducing apparatus comprising: data reading means for reading out the ciphered digital signals from the data recording area; a cipher key information reading means provided so as to face outside surface of the medium perpendicular to the surface having the recording layer of the optical disc for reading out the cipher key information; deciphering means for deciphering the ciphered digital signals and restoring the original data by using the cipher key information obtained with the cipher key information reading means.
Claim 5
Dependent Claim
164 words
A reproducing apparatus for reading out an original data from an optical disc having a data recording area recorded with ciphered digital signals and a cipher key information area recorded with cipher key information, the cipher key information being formed at outside surface of the medium perpendicular to the surface having the recording layer of the optical disc, outside surface of the medium perpendicular to the surface having the recording layer being formed other than the data recording area of the optical disc, the reproducing apparatus comprising: data reading means for reading out the ciphered digital signals from the data recording area; a cipher key information reading means provided so as to face outside surface of the medium perpendicular to the surface having the recording layer of the optical disc for reading out the cipher key information; deciphering means for deciphering the ciphered digital signals and restoring the original data by using the cipher key information obtained with the cipher key information reading means.