JP2004111035A - Digital information i/o device, receiving device, recording device, and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the necessity of protecting a copyright by preventing the wire tapping and tampering of a program on a digital bus interface during the transfer of a compressed video such as a program and an audio signal through a digital interface when a digital broadcast receiver and a digital VTR are connected to each other. <P>SOLUTION: An input digital signal is supplied to a cipher circuit 303 and a changeover switch 305. The copy limit information of the digital signal input from an input terminal 301 is input to an input terminal 302. A copy limit information determination circuit 304 executes determination based on the copy limit information input from the input terminal 302, operates the cipher circuit 303, and switches the changeover switch 305. That is, since the input digital signal is ciphered and output based on the copy limit information, wire tapping and tampering are prevented, and thereby the copyright of a program is protected. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an apparatus for protecting the copyright of digital information digitally transmitted between an information home appliance and a computer.

In recent years, research on data compression of video, audio, and the like using digital technology has been advanced, and storage and transmission of such data has become easier. Along with this, digitization is also rapidly progressing in the field of broadcasting.

For example, there is known a system in which analog video and audio signals are digitally compressed and encoded with high efficiency using the MPEG (Moving Picture Experts Group) standard, and broadcast through satellites or coaxial cables. As an apparatus for receiving this digital broadcast, there is a digital broadcast receiver called a set-top box.

As home video and audio signal recording and playback equipment, the development of digital VTRs that can record and reproduce digital compression encoded video and audio signals such as digital TV broadcasts as digital signals using magnetic tapes is underway. Have been.

(4) The digital broadcast receiver and the digital VTR are connected by a digital interface, so that the received digital broadcast can be stored with high quality.

Patent Document 1 discloses a technique for receiving a digital signal transmitted by multiplexing a plurality of pieces of information and selecting a desired program. Further, a digital VTR using a rotating magnetic head is described in, for example, Patent Document 2.

非 Further, Non-Patent Document 1 describes in detail a digital broadcast recording system in which a digital broadcast receiver and a digital VTR are connected by a digital interface.

JP-A-8-56350 JP-A-5-174496 IEE Transactions on Consumer Electronics, Vol. 42, No. 3, August 1996, pp. 617-622 (IEEE Transactions on Consumer Electronics, Vol. 42, No. 3, August 1996, p617-622, "Newly Developed D- VHS Digital Tape Recording System for the Multimedia Era ")

(4) When recording and reproducing a digital broadcast with a digital VTR or the like via a digital interface, it is necessary to protect eavesdropping and falsification of information on the digital interface.

An object of the present invention is to protect the copyright of digital contents on a digital interface.

To achieve the above tasks,
Digital information,
Enter copy restriction information indicating prohibition of copying of the digital information, permission only once, permission without restriction,
Encryption conversion means for encrypting and outputting the digital information;
Copy restriction information determining means;
Output switching means for selecting and switching between the output of the encryption conversion means and the digital information by the output of the copy restriction information determining means,
If the copy restriction information discrimination means determines that the copy restriction information indicates that copying is prohibited or is permitted only once, the output switching means is selected to output the output of the encryption conversion means. ,
If the copy restriction information discrimination means determines that the copy restriction information indicates that copying is permitted, the output switching means is selected to output the digital information.

As described above, it is possible to protect the copyright of digital contents transmitted on the digital bus interface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a block configuration of a first embodiment of the present invention.
In the figure, 301 is a digital signal input terminal, 302 is a copy restriction information input terminal, 303 is an encryption circuit, 304 is a copy restriction information determination circuit, 305 is a changeover switch, 306 is a copy restriction information addition circuit, and 307 is an output terminal. is there.

The digital signal input from the input terminal 301 is supplied to the encryption circuit 303 and the changeover switch 305. To the input terminal 302, copy restriction information of the digital signal input from the input terminal 301 is input. The copy restriction information is, for example, such information that 2-bit digital data is “11” for copy prohibition, “10” for one-time copy permitted, and “00” for unlimited copy permitted.

The copy restriction information discrimination circuit 304 performs a discrimination process based on the copy restriction information input from the input terminal 302, and when the copy restriction information is "11" or "10", that is, copying is prohibited or copying is allowed only once. In this case, the encryption circuit 303 is operated and the switch 305 is switched to the Cr side. If the copy restriction information is "00", that is, if copying is possible without any restriction, the encryption circuit 303 is stopped and the switch 305 is switched to the Th side.

The encryption circuit 303 encrypts an input digital signal using a predetermined encryption key and outputs the encrypted digital signal. Here, even if an error such as a bit error occurs during transmission, encryption processing is performed in units of a block composed of a plurality of bits so that the error does not affect subsequent data, that is, there is no error propagation. A block cipher that can be realized with a simple circuit configuration is used.

FIG. 2 shows an embodiment of the encryption circuit 303. In the figure, 3031 and 3035 are block processing units, 3032, 3033 and 3034 are encryption processing units, Xa and Xb are upper and lower bits of input block data, Ya and Yb are encrypted data, and K is encryption data. Is the key. As shown in the figure, the input data X is converted by the block processing unit 3031 into a block composed of a plurality of bits. For example, 64 bits are regarded as one block, and upper 32 bits Xa and lower 32 bits Xb of the block are output. Xa and Xb are XORed (311), bit-shifted and added (312, 313, 315: A << p: A << p cyclically shifts A to the left by p bits in the encryption processing unit 3032. ), The addition operation (314, 316) is performed, the result is input to the subsequent encryption processing units 3033, 3034, and further to an encryption processing unit (not shown), and the encryption is performed by performing a multi-stage repetition operation. Data Ya and Yb are obtained.

Then, the block processing unit 3035 converts the block sequence into the original bit sequence and outputs the same as encrypted data Y. In addition, although not shown, the supply of a clock signal serving as a reference for processing such as an addition operation or the selection of latching or holding input data of a register for holding an operation result is selected by an external signal. By setting the so-called enable signal on the holding side, the arithmetic processing is stopped and power consumption can be reduced.

In FIG. 1, the copy restriction information adding circuit 306 adds the copy restriction information input from the input terminal 302 to the output data. As an addition method, for example, it can be realized by storing copy restriction information as a header at the head of output data. After these processes, output data is output from the output terminal 307.

By the above operation, the digital signal whose copyright must be protected is subjected to encryption processing and output, so that the copyrighted work can be protected from eavesdropping, tampering, etc. unless the decryption processing is performed to decrypt the encryption. . If the copy restriction information indicates that copying is permitted without any restriction, the copyrighted work can be freely used because no encryption processing is performed.

In this embodiment, the switching of whether or not to perform encryption and decryption processing on the digital signal is performed outside the encryption / decryption circuit 303. However, the same processing may be performed inside the encryption / decryption circuit 303. Good.

FIG. 3 is a diagram showing a block configuration of the second embodiment of the present invention, and corresponds to the receiving side of the first embodiment shown in FIG.

In the figure, reference numeral 401 denotes a digital signal input terminal, 402 denotes a copy restriction information separation / determination circuit, 403 denotes a decoding circuit, 404 denotes a changeover switch, and 405 denotes an output terminal.

The digital signal input from the input terminal 401 is separated in the copy restriction information separation / determination circuit 402 by the copy restriction information added in the first embodiment, and the remaining digital signals are output. When the copy restriction information is "11" or "10", that is, when copying is prohibited or copying is allowed only once, the decoding circuit 403 is operated and the changeover switch 404 is set to the Cr side. Switch to. When the copy restriction information is "00", that is, when copying is permitted without limitation, the decoding circuit 403 is stopped and the changeover switch 404 is switched to the Th side.

The decryption circuit 403 decrypts the input digital signal using the same decryption key as the encryption key used in the first embodiment for the encryption processing, and outputs the decrypted digital signal. As the decoding method, for example, an algorithm that repeatedly performs a bit circulating operation, a bit replacement operation, and the like in a reverse process corresponding to the first embodiment is used.

According to the above operation, the digital signal whose copyright needs to be protected is subjected to decoding processing and output. If the copy restriction information indicates that copying is permitted, the digital signal is output without being subjected to decoding processing.

As described above, as shown in the first and second embodiments, for example, when the first embodiment and the second embodiment are connected by a digital bus, the copyright must be protected on the bus. Since the copyrighted work is transmitted after being encrypted, the copyright of the copyrighted work can be protected from eavesdropping and tampering.

FIG. 4 is a diagram showing a block configuration of a third embodiment of the present invention. An example in which an MPEG2 system, which is an international standard, is used as a digital signal handled in this embodiment will be described.

In the figure, 100 is a recording / reproducing device, 200 is a digital broadcast receiving device, 101 is an input / output terminal for digital broadcast signals, etc., 102 is a digital interface circuit, 103 is an encryption / decryption circuit, 1041 is a recording / reproducing signal processing circuit, 1042 Denotes a recording amplifier, 1043 denotes a reproducing amplifier, 1051 denotes a rotating drum, 1052 denotes a magnetic head, 106 denotes a magnetic tape, 107 denotes a servo circuit, and 108 denotes a controller. 201 is an input terminal for inputting a digital broadcast wave, 2021 is a tuner, 2022 is a demodulation and error correction circuit, 2023 is a selection circuit, 2024 is an MPEG decoder, 203 is a video / audio output terminal, 204 is a controller, 205 Is an encryption / decryption circuit, 206 is a digital interface circuit, and 207 is an input / output terminal for digital broadcast signals and the like.

(4) The digital broadcast wave broadcast from the broadcast station is input to the digital broadcast receiving device 200 from the input terminal 201. The broadcast wave is, for example, digital satellite broadcast using a satellite, terrestrial wave, digital broadcast via a cable, or the like. Here, it is assumed that the video and audio signals are compressed and packetized on the broadcast station side by the MPEG system.

(4) The tuner 2021 receives the input broadcast wave, and tunes and detects the broadcast wave of the designated frequency by the controller 204. The detected received signal is modulated by a modulation method such as, for example, four-phase phase modulation (QPSK), and is subjected to demodulation and error correction processing in the next demodulation and error correction circuit 2022. As shown in FIG. 5A, the obtained digital signal has a multiplexed signal (Transport Stream, hereinafter referred to as TS) format in which packets such as compressed video and audio signals of a plurality of channels are multiplexed. Has become. The size of the packet is defined as 188 bytes in the case of the MPEG2 standard.

The selection circuit 2023 selects only packets necessary for decoding the video signal and the audio signal of the specified channel from the demodulated TS by the controller 204 (FIG. 5B).

The operation flow of the selection circuit 2023 will be described below. First, the user inputs the organization channel of the program desired to be viewed. An organization channel is a term for summarizing video, audio, and the like that constitute one program, and corresponds to a television channel in conventional analog broadcasting. In digital broadcasting, one frequency in which a plurality of programs are multiplexed is generally called a physical channel. Next, a PAT (Program Association Table) included in the currently received TS is received.

$ PAT is one of the tables in PSI (Program Specific Information) defined by the MPEG2 standard. When the PAT is received, the PID of the PMT (Program Map Table) in which the PID (Packet ID), which is the identification number of the packet such as video and audio, which constitutes the specified organization channel is described, is acquired from the PAT. Receiving the PMT having The TS packet mainly includes a header 11 (a) and data 11 (b) as shown in FIG. The header 11 (a) stores the PID 111 which is the identification number of the packet as shown in FIG.

As described above, it is necessary to acquire this PID in order to identify which information, such as video, audio, PCR, etc., constituting the composition channel is stored in each packet. PMT is one of PSI tables. The PMT includes a video (voice) constituting each of the channels included in the TS being received, and a PCR (Program Clock Reference) indicating time information measured by a reference clock used for compressing the video and audio signals. The PID of the packet is described, and the PID of the video, audio, PCR, etc. of the desired program is obtained. Further, for example, copy restriction information of each organization channel is also stored in the PMT.

に Returning to FIG. The selection circuit 2023 supplies a packet sequence having a PID storing video and audio to the MPEG decoder 2024. The MPEG decoder 2024 expands the compressed digital video and audio signals to restore the video and audio. The restored video and audio signals are output from the output terminal 203, and the user can view the video and audio signals through a monitor television or the like.

Next, a recording operation of the recording / reproducing apparatus 100 will be described.
The selection circuit 2023 supplies a packet sequence of video, audio, PSI, PCR, and the like of the designated one organization channel to the digital interface circuit 206 via the encryption / decryption circuit 205. At this time, the selection circuit 2023 transmits the copy restriction information of the PMT packet storing the copy restriction information of the designated one organization channel to the encryption / decryption circuit 205 and the digital interface circuit 206 via the controller 204.

A packet sequence of video, audio, PCR, etc. of one organization channel output from the selection circuit 2023 and encrypted by the encryption / decryption circuit 205 is recorded / reproduced by the digital interface circuit 102 via the input / output terminals 207 and 101. The data is supplied to the encryption / decryption circuit 103 on the circuit 100 side and decrypted.

FIG. 6 is a diagram showing a block configuration of one embodiment of the encryption / decryption circuits 205 and 103. Reference numerals 501, 505, and 508 denote input / output terminals, reference numerals 502 and 504 denote switching switches, reference numeral 503, an encryption / decryption circuit, reference numeral 506, a copy restriction information determination circuit, and reference numeral 507, an external interface circuit. As described above, in the case of the encryption / decryption circuit 205, the copy restriction information transmitted from the controller 204 is sent to the copy restriction information determination circuit 506 via the input / output terminal 508 and the external interface circuit 507.

The copy restriction information determining circuit 506 switches the encryption / decryption circuit 503 and the changeover switches 502 and 504 based on the received copy restriction information. For example, similarly to the first embodiment, when the copy restriction information is “11” or “10”, that is, when the copy is prohibited or the copy is allowed only once, the encryption / decryption circuit 503 encrypts or decrypts. And the changeover switches 502 and 504 are switched to the Cr side. When the copy restriction information is “00”, that is, when copying is permitted without any restriction, the encryption / decryption circuit 503 is stopped and the changeover switches 502 and 504 are switched to the Th side.

6, the encryption / decryption circuit 205 outputs the digital signal input to the input / output terminal 501 as it is or by encrypting the digital signal by the encryption / decryption circuit 503 and outputs the digital signal from the input / output terminal 505. The digital signal input to the input / output terminal 505 is decrypted as it is or decrypted by the encryption / decryption circuit 503 and output from the input / output terminal 501 based on the copy restriction information received from. Also, an encryption key for encryption / decryption is received via the external interface circuit 507.

The digital interface circuits 206 and 102 realize a protocol such as a high-speed digital bus interface such as IEEE 1394, and have a function of transmitting data at a high speed while maintaining the time interval of an input packet sequence.

FIG. 7 is a diagram showing a block configuration of one embodiment of the digital interface circuits 206 and 102. In FIG. In the figure, 601 605 607 are input / output terminals, 602 is a packet processing circuit, 603 is a buffer circuit, 604 is a header processing circuit, and 606 is an external interface circuit. In the figure, the above-mentioned encryption / decryption circuit is connected to the input / output terminal 601 side, and the digital bus interface is connected to the input / output terminal 605 side. In the digital interface circuit 206, the packet sequence sent from the encryption / decryption circuit 205 is sent to the packet processing circuit 602 via the input / output terminal 601 so that the packet processing circuit 602 maintains the time interval between these packet sequences. The time of arrival is added to the beginning of each packet as a time stamp. The packet sequence to which the time stamp has been added is temporarily stored in the buffer circuit 603, and the header processing circuit 604 selects one, a plurality of packets received by the packet processing circuit 602 as integers as bus packets to be sent out onto the digital bus interface. The packet is sent to the digital bus interface after adding the packet restriction information received from the controller 204, the size of the bus packet, and a packet header such as an error correction code to the divided one.

In the digital interface circuit 102, the copy restriction information added by the header processing circuit 604 of the digital interface circuit 206 is read from the bus packet input via the input / output terminal 605, After being transmitted to the controller 108 via the interface circuit 606 and verifying the size of the bus packet, the data error, and the like, the bus packet is stored in the buffer circuit 603, and the divided packets are assembled into the original packets and processed. The circuit 602 refers to the time stamp added to the head of each packet and outputs packets while measuring the output timing.

In this way, in FIG. 4, a packet train of video, audio, PCR, etc. of one organization channel output from the selection circuit 2023 and encrypted by the encryption / decryption circuit 205 is transmitted via the input / output terminals 207 and 101. The digital interface circuit 102 supplies the data to the encryption / decryption circuit 103 of the recording / reproduction circuit 100 while reproducing the time interval, and decrypts the data.

FIG. 8 is a diagram showing the timing of a packet sequence from the input of the encryption / decryption circuit 205 to the output of the encryption / decryption circuit 103. The packet sequence input to the encryption / decryption circuit 205 ((a) in the figure) is encrypted by the encryption / decryption circuit 205 (indicated by 'in FIG. (B)), and a packet header is added by the digital interface circuit 206. Then, the data is sent out to the digital bus interface (FIG. 3 (c)). In the packet sequence received by the digital interface circuit 102, the packet header is separated in the digital interface circuit 102 ((d) in the figure), decrypted in the encryption / decryption circuit 103, and the original packet sequence is output. (E). Of course, if the copy restriction information indicates that copying is permitted, the encryption / decryption processing is not performed.

FIG. 8 shows an example of a packet sequence of one organization channel. However, when a packet sequence of a plurality of organization channels is transmitted by a digital interface circuit, encryption / decryption is performed by copy restriction information corresponding to each organization channel. Transmission is performed while switching the operation for each packet.

FIG. 9 is a diagram showing the timing of each packet sequence when transmitting a packet sequence of a plurality of organization channels. Here, for example, it is assumed that aCH has copy restriction information, bCH has copy restriction information that can be copied once, and cCH has copy restriction information that allows unlimited copy. In this case, encryption / decryption processing is performed on aCH and bCH, but cCH is transmitted as it is. At this time, the packet interval of the cCH packet can be maintained through the delay circuit for the delay time of the encryption / decryption processing. Further, for example, when the aCH packet and the cCH packet are transmitted as the same bus packet, the copy restriction information of each channel is stored in the same packet header, and the receiving side refers to it. , ACH packets are decoded, and the cCH packets are output as they are. As a result, the receiving-side apparatus can receive the cCH packet sequence without a decoding circuit, but cannot receive the aCH and bCH packet sequences without decoding by the decoding circuit.

(4) Returning to FIG. The encryption / decryption circuit 103 passes the decrypted packet sequence to the recording / reproduction signal processing circuit 1041. The recording / reproducing signal processing circuit 1041 adds the copy restriction information received from the controller 108, a predetermined control code, an error correction code, and the like, and supplies it to the recording amplifier 1042 as a recording signal. At this time, the copy restriction information to be recorded is, for example, when the copy restriction information of the transmitted packet sequence received by the digital interface circuit 102 is “10”, that is, when copying is permitted only once, The restriction information is recorded after being changed to "11", that is, copy prohibition. When the copy restriction information is “00”, that is, when copying is permitted without restriction, “00” is recorded as it is. Further, when the copy restriction information is "11", that is, indicates that copying is prohibited, recording is not performed.

The servo circuit 107 controls the rotation phase of the rotating drum 1051 and forms a predetermined recording track on the magnetic tape 106 by the magnetic head 1052 mounted on the rotating drum 1051 and records the track.

に よ り By the above processing, the program selected by the user can be recorded on the magnetic tape. At this time, since the program information is encrypted and transmitted on the digital bus interface, eavesdropping and falsification can be prevented, and the copyright of the program can be protected.

Next, the reproducing operation will be described.
The servo circuit 107 controls the rotation phase of the rotating drum 1051, and the reproduction signal obtained from the recording track by the magnetic head 1052 that scans the recording track on the magnetic tape 106 is amplified by the reproduction amplifier 1052, and the reproduction signal is recorded. The data is input to the processing circuit 1041. The recording / reproducing signal processing circuit 1041 performs error correction processing and the like, and reproduces the packet. At this time, the tape copy restriction information recorded on the magnetic tape 106 at the time of recording is also reproduced to notify the controller 108.

The reproduced packet sequence is encrypted by the encryption / decryption circuit 103 based on the copy restriction information from the controller 108, and the digital interface circuit 102 adds the copy restriction information as a packet header and sends it to the digital bus interface. Can be The packet sequence is separated through the digital interface circuit 206 while keeping the time interval of each packet, and is separated by the encryption / decryption circuit 205 based on the copy restriction information. Supplied. After that, the user can view the information on the magnetic tape by the same operation as when receiving the broadcast wave. At this time, similarly to the recording, the program information reproduced from the magnetic tape is encrypted and transmitted on the digital bus interface, so that eavesdropping and tampering can be prevented, and the copyright of the program can be prevented. Can be protected.

In the present embodiment, a rotary head type magnetic recording device has been described as an example of a recording / reproducing device. However, the present invention is not limited to this. For example, an optical disk or a semiconductor memory may be used as a recording medium. Further, as an example of the digital interface, an example of the IEEE 1394 high-speed digital bus interface has been described, but the present invention is not limited to this. Further, in the present embodiment, an example in which the digital broadcast receiving apparatus and the recording / reproducing apparatus are connected one-to-one with a digital interface has been described, but the present invention is not limited to this. For example, the digital broadcast receiving apparatus and the computer, the computer Various connection forms are conceivable, such as a recording / reproducing apparatus, a daisy-chain connection between a digital broadcast receiving apparatus and two recording / reproducing apparatuses.

FIG. 3 is a diagram showing a block configuration of a first embodiment according to the present invention. FIG. 2 is a diagram illustrating a block configuration of an embodiment of an encryption circuit according to the present invention. FIG. 6 is a diagram showing a block configuration of a second embodiment according to the present invention. FIG. 11 is a diagram showing a block configuration of a third embodiment according to the present invention. FIG. 3 is a diagram illustrating a packet multiplexing method and a packet structure; FIG. 3 is a diagram showing a block configuration of an embodiment of an encryption / decryption circuit according to the present invention. FIG. 2 is a diagram showing a block configuration of an embodiment of a digital interface circuit according to the present invention. FIG. 4 is a diagram illustrating the timing of a packet sequence according to the present invention. FIG. 4 is a diagram illustrating the timing of a packet sequence according to the present invention.

Explanation of reference numerals

REFERENCE SIGNS LIST 100 recording / reproducing apparatus, 102 digital interface circuit, 103 encryption / decryption circuit, 1041 recording / reproduction signal processing circuit, 1051 rotating drum, 106 magnetic tape, 107 servo circuit, 108 controller, 200 digital broadcasting Receiver 2021, Tuner 2022, Demodulation and error correction circuit, 2023 Selection circuit, 2024 MPEG decoder, 205 Encryption / decryption circuit, 206 Digital interface circuit, 303 Encryption circuit, 304 Copy restriction information discrimination circuit , 305: switch, 306: copy restriction information adding circuit, 402: copy restriction information separation / determination circuit, 403: decryption circuit, 404: switch, 503: encryption / decryption circuit, 506: copy restriction information determination circuit, 507 ... External interface Over scan circuit, 602 ... packet processing circuit, 604 ... header processing circuit, 606 ... external interface circuit.

Claims (33)

First digital information;
Input copy restriction information indicating prohibition of copying of the first digital information, permission only once, permission without restriction,
Encryption conversion means for inputting the first digital information, encrypting the first digital information, and outputting the second digital information;
Copy restriction information determining means for inputting and determining the copy restriction information,
Switching means for selecting and outputting either the first digital information or the second digital information based on the output of the copy restriction information determining means,
If the copy restriction information is determined by the copy restriction information determining means to indicate that the copy restriction information is permitted without any restriction, the switching means is selected to output the first digital information.
When the copy restriction information determining means determines that the copy restriction information indicates that copying is prohibited or is permitted only once, the switching means is caused to select to output the second digital information. A digital information input / output device characterized by the following. In claim 1,
The first digital information includes:
A digital information input / output apparatus, which is a packet sequence formed by multiplexing one set of one program and the copy restriction information of the program, which is packetized in a first packet format. In claim 2,
The one information program includes at least one of a bit-compressed video signal and a bit-compressed audio signal. In claim 1,
An information adding unit is provided at a subsequent stage of the switching unit,
The digital information input / output device according to claim 1, wherein said information adding means outputs third digital information obtained by adding said copy restriction information to said first digital information or said second digital information. In claim 4,
The information adding means packetizes the third digital information obtained by adding the copy restriction information to the first digital information or the second digital information in a second packet format and outputs the packetized data. Digital information input / output device. In claim 1,
The digital information input / output unit controls the cryptographic conversion unit to stop when the copy restriction information determination unit determines that the first copy restriction information indicates unlimited permission. apparatus. Inputting, into the first digital information, second digital information to which copy restriction information has been added, indicating that copying of the first digital information is prohibited, allowed only once, and allowed unlimitedly;
Decryption conversion means for receiving the first digital information, decrypting the encryption, and outputting the third digital information;
Copy restriction information separation determining means for separating the first digital information and the copy restriction information from the second digital information and determining the copy restriction information;
Switching means for selecting and outputting either the first digital information or the third digital information based on the output of the copy restriction information separation determining means,
When the copy restriction information indicates that the copy restriction information indicates that copying is permitted by the copy restriction information separation determining unit, the switching unit is selected to output the first digital information,
When the copy restriction information separation determining unit determines that the separated copy restriction information indicates that copying is prohibited or is permitted only once, the switching unit outputs the third digital information. A digital information input / output device characterized by being selected. In claim 7,
2. The digital information input / output device according to claim 1, wherein the second digital information is a packet sequence packetized in a first packet format. In claim 7 or 8,
The digital information input / output device according to claim 1, wherein an output of said switching means is a packet sequence packetized in a second packet format in which one program or a plurality of programs are multiplexed. The digital information input / output apparatus according to claim 9, wherein the one program includes at least one of a bit-compressed video signal and a bit-compressed audio signal. In claim 7,
A digital information input / output device, wherein when the copy restriction information separating / determining means determines that the copy restriction information indicates unlimited permission, the decoding / conversion means is controlled to stop. A first packetized program packetized in the first packet format, and copy restriction information packetized in the first packet format, indicating that the duplication of the program is prohibited, permitted only once, and permitted indefinitely. A plurality of sets of digital information are received in a time-division multiplexed broadcast signal. From the received broadcast signal, the first digital information and the copy restriction information of the first digital information are combined into one set or Receiving means for selecting and outputting a plurality of sets,
Encryption conversion means for inputting the first digital information, encrypting the first digital information, and outputting the second digital information;
Copy restriction information determining means for inputting and determining the copy restriction information,
Switching means for selecting and outputting either the first digital information or the second digital information based on the output of the copy restriction information determining means,
If the copy restriction information is determined by the copy restriction information determining means to indicate that the copy restriction information is permitted without any restriction, the switching means is selected to output the first digital information.
When the copy restriction information determining means determines that the copy restriction information indicates that copying is prohibited or is permitted only once, the switching means is caused to select to output the second digital information. A receiving device characterized by the above-mentioned. In claim 12,
A receiving apparatus characterized in that the program includes at least one of a bit-compressed video signal and a bit-compressed audio signal. In claim 12,
An information adding unit is provided at a subsequent stage of the switching unit,
The receiving apparatus according to claim 1, wherein said information adding means outputs third digital information obtained by adding said copy restriction information to said first digital information or said second digital information. In claim 14,
The information adding means packetizes the third digital information obtained by adding the copy restriction information to the first digital information or the second digital information in a second packet format and outputs the packetized data. Receiver. Inputting, into the first digital information, second digital information to which copy restriction information has been added, indicating that copying of the first digital information is prohibited, allowed only once, and allowed unlimitedly;
Decryption conversion means for receiving the first digital information, decrypting the encryption, and outputting the third digital information;
Copy restriction information separation determining means for separating the first digital information and the copy restriction information from the second digital information and determining the copy restriction information;
Switching means for selecting and outputting the first digital information or the third digital information according to the output of the copy restriction information separation determining means;
Inputting one bit-compressed program or a packet sequence packetized in a first packet format in which a plurality of programs are multiplexed, which is the output of the switching means, and expanding the bits to view program information that can be viewed. Receiving means for obtaining
When the separated copy restriction information is determined by the copy restriction information separation determining unit to indicate that copying is permitted, the switching unit is selected to output the first digital information,
When the copy restriction information separation determining unit determines that the copy restriction information indicates that copying is prohibited or is permitted only once, the switching unit is selected to output the third digital information.
A receiving apparatus characterized in that the output of the second switching means is bit-extended to obtain viewable program information. In claim 16,
The receiving device according to claim 1, wherein the second digital information is a packet sequence packetized in a second packet format. Inputting, into the first digital information, second digital information to which copying of the first digital information is prohibited, which can be performed only once, and which can be performed without restriction;
Decryption conversion means for receiving the first digital information, decrypting the encryption, and outputting the third digital information;
Copy restriction information separation determining means for separating the first digital information and the first copy restriction information from the second digital information, and determining the first copy restriction information;
Switching means for selecting and outputting the first digital information or the third digital information according to the output of the copy restriction information separation determining means;
Copy restriction information changing means for changing the first copy restriction information to second copy restriction information;
Recording means for recording the output of the switching means and the second copy restriction information on a recording medium,
If the first copy restriction information is determined by the copy restriction information separation determining means to indicate that copying is permitted, the switching means is selected to output the first digital information. The copy restriction information indicating that copying is permitted is set as the second copy restriction information by the restriction information changing means,
When the copy restriction information separation determining unit determines that the separated first copy restriction information indicates that it can be performed only once, the switching unit is selected to output the third digital information. At least, the copy restriction information changing means sets copy restriction information indicating copy prohibition as the second copy restriction information,
A recording apparatus for recording the output of the switching means on a recording medium and recording the second copy restriction information on a recording medium. In claim 18,
2. The recording apparatus according to claim 1, wherein the second digital information is a packet sequence packetized in a first packet format. In claim 18 or 19,
The recording apparatus according to claim 1, wherein an output of said switching means is a packet sequence packetized in a second packet format in which one program or plural programs are multiplexed. 21. The recording apparatus according to claim 20, wherein the one program includes at least one of a bit-compressed video signal and a bit-compressed audio signal. In claim 18,
When the copy restriction information separation determining unit determines that the separated first copy restriction information indicates prohibition of duplication, the control unit controls the decryption / conversion unit to stop and stops the recording unit. A recording apparatus characterized in that it is controlled to perform First digital information;
A reproduction means for reproducing one or a plurality of sets of copy restriction information, which indicates that the duplication of the first digital information is prohibited, can be performed only once, and is unlimited, and is reproduced from a recording medium;
Encryption conversion means for inputting the first digital information, encrypting the first digital information, and outputting the second digital information;
Copy restriction information determining means for inputting and determining the copy restriction information,
Switching means for selecting and outputting either the first digital information or the second digital information based on the output of the copy restriction information determining means,
If the copy restriction information is determined by the copy restriction information determining means to indicate that the copy restriction information is permitted without any restriction, the switching means is selected to output the first digital information.
When the copy restriction information determining means determines that the copy restriction information indicates that copying is prohibited or is permitted only once, the switching means is caused to select to output the second digital information. A reproducing apparatus characterized by the above-mentioned. In claim 23,
The first digital information includes:
A reproducing apparatus characterized in that it is a packet sequence composed of one program and the copy restriction information of the program, which is packetized in a first packet format. 25. The reproducing apparatus according to claim 24, wherein the one program includes at least one of a bit-compressed video signal and a bit-compressed audio signal. In claim 23,
A reproducing apparatus provided at a subsequent stage of the switching means, for outputting third digital information obtained by adding the copy restriction information to the first digital information or the second digital information. . In claim 26,
The information adding means packetizes the third digital information obtained by adding the copy restriction information to the first digital information or the second digital information in a second packet format and outputs the packetized data. Playback device. In claim 1,
A digital information input / output device, wherein the cipher conversion means is a block cipher conversion means for dividing the first digital information into blocks each having a predetermined length of a plurality of bits and performing encryption in units of the blocks. . In claim 12,
The receiving device according to claim 1, wherein the cipher conversion unit is a block cipher conversion unit that divides the first digital information into blocks each having a fixed length including a plurality of bits and performs encryption in units of the blocks. In claim 23,
The reproducing apparatus according to claim 1, wherein the cipher conversion unit is a block cipher conversion unit that divides the first digital information into blocks each having a fixed length including a plurality of bits and performs encryption in units of the blocks. In claim 7,
The digital information input / output device according to claim 1, wherein said decoding / conversion means is a block decoding / conversion means for dividing said first digital information into blocks each having a predetermined length consisting of a plurality of bits and performing decoding in units of said blocks. . In claim 16,
The receiving apparatus according to claim 1, wherein said decoding / conversion means is a block decoding / conversion means for dividing said first digital information into blocks each having a fixed length consisting of a plurality of bits and performing decoding in units of said blocks. In claim 18,
The recording apparatus according to claim 1, wherein said decoding / conversion means is a block decoding / conversion means for dividing said first digital information into blocks each having a fixed length consisting of a plurality of bits and performing decoding in units of said blocks.

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