Patent ID: 6516064
Filing Date: 2003-02-04
Classification: G06F,G11B

Abstract:
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.