US 6,516,064 B1 · Signal recording apparatus, signal record medium and signal reproducing apparatus

Abstract

A signal reproducing apparatus in which unauthorized decoding or copying is rendered difficult. The apparatus is configured for reproducing ciphered data from a disc-shaped record medium 101 on which there are recorded data ciphered by at least one encryption operation and the key storage site information specifying the arraying site for at least one key information item used for deciphering the ciphered data. The apparatus includes a reproducing head device 12 for reading out the ciphered data and the key storage site information from the record medium 101, a TOC decoder 219, a CPU 224 and a digital signal processing circuit 220 for decoding the ciphered data using the key information stored on the site designated based on the key storage site information.

Claims10

Dependent claims

Signal recording apparatus for recording an enciphered signal on a recording medium, comprising:

means for producing encryption key information;
a number of signal processing means for processing an input signal to be recorded to said recording medium, each of the signal processing means enciphering user data represented by said input signal, and at least one of the signal processing means enciphering said user data by using said encryption key information to generate said enciphered signal representing said user data;
and
means for recording to said recording medium said enciphered signal and key storage information containing location information of said encryption key information as used by said one of the signal processing means, said location information specifying whether said encryption key information has been recorded to said recording medium or whether said encryption key information has been stored to a storage other than said recording medium, said key storage information further containing attribute information for specifying which of the signal processing means has enciphered said user data.

1 more element

Signal reproducing apparatus for reproducing and deciphering from a recording medium an enciphered signal having been recorded on said recording medium by signal recording apparatus including means for producing encryption key information, said signal recording apparatus further including a number of signal processing means for processing an input signal to be recorded to said recording medium, each of the signal processing means enciphering user data represented by said input signal, and at least one of the signal processing means enciphering said user data by using said encryption key information to generate said enciphered signal representing said user data, said signal recording apparatus further including means for recording to said recording medium said enciphered signal and key storage information containing location information of said encryption key information as used by said one of the signal processing means, said location information specifying whether said encryption key information has been recorded to said recording medium or whether said encryption key information has been stored to a storage other than said recording medium, said key storage information further containing attribute information for specifying which of the signal processing means has enciphered said user data, said signal reproducing apparatus comprising:

readout means for reading out said enciphered signal and said key storage information from said recording medium;
and
means for deciphering said enciphered signal using said encryption key information and said attribute information obtained from said key storage information.

Dependencies are inferred from the claim text.

Signal recording apparatus, signal record medium and signal reproducing apparatus

Life of this patent

Signal recording apparatus, signal record medium and signal reproducing apparatus

Life of this patent

Abstract

Claims10