Recording and reproducing apparatus

Claim 2

A recording and reproducing apparatus comprising: first identification code input means for inputting an identification code; a scrambling circuit for generating a scrambling pattern according to the input identification code and for scrambling a video signal and/or an audio signal by using a signal representing the generated scrambling pattern; an operation circuit for performing a predetermined operation on the input identification code and for outputting an ID signal representing a result of the operation; operation designating means for outputting an operation identification signal designating the predetermined operation to the operation circuit; a multiplexing circuit for performing a multiplexing on the scrambled video signal and/or the scrambled audio signal and the ID signal and the operation identification signal and for outputting a signal obtained as a result of the multiplexing; and recording means for recording the signal output from the multiplexing circuit on a recording medium.

Claim 3

A recording and reproducing apparatus comprising: reproduction means for reproducing signal recorded on a recording medium; a demultiplexing circuit for separating a signal reproduced by the reproduction means into a reproduced video signal and/or a reproduced audio signal which have been scrambled and recorded on the recording medium, a reproduced first ID signal and a reproduced operation identification signal; identification code input means for inputting an identification code; an operation circuit for performing a predetermined operation designated by the reproduced operation identification signal on the identification code input by the identification code input means and for outputting a second ID signal representing a result of the operation; a comparator for comparing a value represented by the second ID signal with a value represented by the reproduced first ID signal and for outputting a signal representing a result of the comparison; and a descrambling circuit for performing a descrambling of the reproduced video signal and/or audio signal, which have been scrambled and recorded on the recording medium, according to the signal output by the comparator.

Claim 4

The recording and reproducing apparatus according to claim 1, wherein the identification code is m-bytes in length, wherein both of the first and second operation circuits generate a function of the identification code and then divides the generated function by a polynomial to obtain a quotient and a remainder and subsequently, the first operation circuit outputs a signal representing the remainder as the first ID signal, and the second operation circuit outputs a signal representing the remainder as the second ID signal.

Claim 5

The recording and reproducing apparatus according to claim 2 or 3, wherein the identification code is m-bytes in length, wherein the operation circuits generates a function of the identification code and then divides the generated function by a polynomial to obtain a quotient and a remainder and subsequently, the operation circuit outputs a signal representing the remainder as the ID signal.

Claim 6

The recording and reproducing apparatus according to claim 4 or 5, wherein the function is the identification code to an nth power.

Claim 7

The recording and reproducing apparatus according to claim 4, 5 or 6, wherein sets of functions of the identification code, lengths of the identification code and polynomials are predetermined and wherein the operation identification signal designates one of the sets.

Claim 8

A recording and reproducing apparatus having a recording portion, a storage portion and a reproducing portion, the recording portion comprising: first identification code input means for inputting an identification code; a scrambling circuit for generating a scrambling pattern according to the input identification code and for scrambling a video signal and/or an audio signal by using a signal representing the generated scrambling pattern; a first operation circuit for performing a predetermined operation on the input identification code and for outputting a first ID signal representing a result of the operation; operation designating means for outputting an operation identification signal designating the predetermined operation to the operation circuit; a multiplexing circuit for performing a multiplexing oh the scrambled video signal and/or the scrambled audio signal and the first ID signal and for outputting a signal obtained as a result of the multiplexing; and recording means for recording the signal output from the multiplexing circuit on a recording medium, wherein the reproducing portion comprising: reproduction means for reproducing the signal recorded on the recording medium; a demultiplexing circuit for separating a signal reproduced by the reproduction means into a reproduced video signal and/or a reproduced audio signal which have been scrambled and recorded on the recording medium, and a reproduced first ID signal; second identification code input means for inputting an identification code; a second operation circuit for performing a predetermined operation designated by the operation identification signal on the identification code input by the second identification code input means and for outputting a second ID signal representing a result of the operation; a comparator for comparing a value represented by the second ID signal with a value represented by the reproduced first ID signal and for outputting a signal representing a result of the comparison; and a descrambling circuit for performing a descrambling of the reproduced video signal and/or audio signal, which have been scrambled in the recording portion, according to the signal output by the comparator, wherein sets of functions of the identification code, lengths of the identification code and polynomials are predetermined and wherein the operation identification signal designates one of the sets and is stored in the storage portion.

Claim 9

A recording and reproducing apparatus having a a storage portion, the recording and reproducing apparatus further comprising: first identification code input means for inputting an identification code; a scrambling circuit for generating a scrambling pattern according to the input identification code and for scrambling a video signal and/or an audio signal by using a signal representing the generated scrambling pattern; an operation circuit for performing a predetermined operation on the input identification code and for outputting an ID signal representing a result of the operation; operation designating means for outputting an operation identification signal designating the predetermined operation to the operation circuit; a multiplexing circuit for performing a multiplexing on the scrambled video signal and/or the scrambled audio signal and the ID signal and for outputting a signal obtained as a result of the multiplexing; and recording means for recording the signal output from the multiplexing circuit on a recording medium, wherein sets of functions of the identification code, lengths of the identification code and polynomials are predetermined and wherein the operation identification signal designates one of the sets and is stored in the storage portion.

Claim 10

A recording and reproducing apparatus having a storage portion, the recording and reproducing apparatus further comprising: reproduction means for reproducing signal recorded on a recording medium; a demultiplexing circuit for separating a signal reproduced by the reproduction means into a reproduced video signal and/or a reproduced audio signal which have been scrambled and recorded on the recording medium, and a reproduced first ID signal; identification code input means for inputting an identification code; an operation circuit for performing a predetermined operation designated by an operation identification signal on the identification code input by the identification code input means and for outputting a second ID signal representing a result of the operation; a comparator for comparing a value represented by the second ID signal with a value represented by the reproduced first ID signal and for outputting a signal representing a result of the comparison; and a descrambling circuit for performing a descrambling of the reproduced video signal and/or audio signal, which have been scrambled and recorded on the recording medium, according to the signal output by the comparator, wherein sets of functions of the identification code, lengths of the identification code and polynomials are predetermined and wherein the operation identification signal designates one of the sets and is stored in the storage portion.

Claim 11

The recording and reproducing apparatus according to claim 8, 9 or 10, wherein the storage portion is detachably provided and is used in common by a plurality of recording and reproducing apparatuses.

Claim 12

The recording and reproducing apparatus according to claim 1, wherein the recording medium is a magnetic tape or a nonvolatile memory provided in a cassette, wherein when an erroneous identification code is input to the first or second identification code input means, a normal reproducing operation is interrupted by ejecting the cassette, or turning off a power.

Claim 13

The recording and reproducing apparatus according to claim 3, wherein the recording medium is a magnetic tape or a nonvolatile memory provided in a cassette, wherein when an erroneous identification code is input to the identification code input means, a normal reproducing operation is interrupted by ejecting the cassette, or turning off a power.