JP2002262227A - Digital information recorder, transmitter and transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent recorded information from being transmitted to the Internet, etc., against the intension of a producer or to make the recorded information to be difficult to be utilized even though the recorded information is transmitted. SOLUTION: Control information accompanying video and sound information is provided with information performing copy limitation and information showing the acceptance/rejection of transmitting the control information through a communication line such as the Internet. In recording information prohibiting transmission on a recording medium, the information is enciphered by using a device key, a contents key, etc. Thus, it is difficult to decode the information even though the medium is removed, inserted into a personal computer and transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus for recording digital information such as video and audio, and in particular, distributes or transmits the recorded information to a third party under the authority of a copyright holder or the like. To a recording device that limits the Further, the present invention relates to a transmitting device for suitably transmitting digital information to such a recording device. In addition, the present invention relates to a transmitting / receiving device that receives and suitably transmits information.

[0002]

2. Description of the Related Art In the field of television broadcasting and devices for recording and reproducing the same, as well as package media such as movie software, digital broadcasting has begun, and consumer digital recording and reproducing devices corresponding to this have been released. .
The package software used in this device will appear in the near future. The advantage of digital broadcasting and digital recording devices is that there is no or very little quality deterioration in the information transmission process and the recording / reproducing process.

In addition, with the spread of the Internet in recent years, it has become easy to distribute and transfer digitized information to a large number of users. However, there is a problem that profits cannot be returned to the copyright holder when many high-quality copies of the information are made and circulated outside the copyright owner's custody, distributed via the Internet, and repeatedly transferred. .

[0004] US Pat. At 5,896,454,
A method of adding 2-bit copy control information to information is disclosed. This controls the operation of the recording apparatus by selecting one of three of copy prohibition, copy permission, and one-generation copy permission according to the will of the copyright holder and the information creator. The recording device does not perform a recording operation when copying is prohibited, and performs a recording operation when copying is permitted. If only one generation is permitted to copy, the recording apparatus performs a recording operation after rewriting this control information to information that does not permit further copying.

Conventionally, in the case of copy permission, the recording apparatus records information without encrypting the information, and in the case of only one generation of copy permission, encrypts and records the information. As a result, information that allows copying only once for time shifting and re-viewing,
It was prevented from being used for other purposes.

[0006]

The matter disclosed in the above prior art is to provide an effective copyright protection method. However, the most disadvantageous for copyright owners is that the information recorded on the medium is
It is transmitted and distributed again without permission. Because it can be sent to a large number of users and even easily transferred to third parties, the profits available are orders of magnitude less than the original ones, and the information is processed and is not related to the original intent. There are problems that are used for things that are not. For this reason, it will be required that even if the copyright holder or the like approves free copying, as well as the information for which copying has been restricted, retransmission on the Internet or the like is not allowed. The above prior art does not describe this matter.

An object of the present invention is to provide an effective solution to the above problems in view of the above problems. That is, it is possible to prevent information recorded on a medium from being transmitted again to a large number of users, distributed, and transferred to a large number of users by using a communication means such as the Internet without knowing the copyright holder. It is another object of the present invention to make it difficult for a user to use received information even if the act is performed.

[0008]

In order to achieve the above object, in a digital information recording apparatus of the present invention, input digital information indicates whether or not recording of digital information on a recording medium is permitted. The digital information includes copy control information and retransmission control information indicating whether or not digital information can be retransmitted to another device using a wired or wireless communication line. A recording circuit for recording on a medium, a control detection circuit for detecting copy control information and retransmission control information from the digital information, and a recording control circuit for controlling a recording operation of the recording circuit based on a detection result of the control detection circuit And an encryption circuit for encrypting digital information to be recorded.

The recording control circuit controls the recording operation of the recording circuit in accordance with the copy control information detected by the control detection circuit, indicates that the copy control information permits recording (Copy Free), and performs retransmission. If the control information indicates that transmission is permitted again, the encryption circuit is not operated,
Indicates that copy control information permits recording (Copy Fre
If e) and the retransmission control information indicates that transmission is not permitted again, the digital information to be recorded is encrypted by the encryption circuit. Also, it indicates that the copy control information permits recording of only one generation (Copy One G
In the case of “eneration”, the digital information to be recorded is encrypted by the encryption circuit, regardless of the retransmission control information.

Here, the encryption circuit includes a first encryption circuit for encrypting digital information based on a content key generated as a random number, and a device key provided for each recording device. A second encryption circuit that encrypts the content key, and records the outputs of the first encryption circuit and the second encryption circuit on a recording medium.

In the digital information transmitting apparatus of the present invention, copy control information indicating whether or not recording of digital information on a recording medium is permitted and digital information received by the receiving apparatus are transmitted through a wired or wireless communication line. And retransmission control information indicating whether or not retransmission is permitted to be transmitted to another device in the digital information.

In the digital information transmitting / receiving apparatus according to the present invention, the received or input digital information is transmitted again to an external device using a wired or wireless communication line. Copy control information indicating whether or not recording is permitted on a recording medium, and retransmission control information indicating whether or not digital information is permitted to be retransmitted to another device using a wired or wireless communication line. A transmission circuit for performing predetermined processing on the digital information and transmitting the digital information again to an external device; a control detection circuit for detecting copy control information and retransmission control information from the digital information; And an encryption circuit for encrypting. If the detected retransmission control information indicates that transmission is permitted again, the digital information to be transmitted again is encrypted by the encryption circuit and transmitted again by the transmission circuit, and the detected retransmission control information does not permit transmission again. Is not transmitted again by the transmission circuit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings as needed. In the embodiment of the present invention, a new control bit is provided as needed.
Prior to the description, the entire system to which the present invention is applied will be described.

FIG. 1 is a block diagram showing an embodiment of the whole system used in the present invention, and shows an example in which information is transmitted / received by broadcasting and recorded / reproduced. This includes devices to which the method of the present invention is applied to prevent the distribution, transfer, or use of information by communication means. 1 is an information providing station such as a broadcasting station,
2 is a relay station, 3 is a receiving device, 4 is a recording and reproducing device, and 5 is a display. Note that when recording a broadcast or the like here, it is recorded on the recording / reproducing device 4. The receiving device 3 may include a device using a hard disk as a recording medium, for example. In the future, it is expected that a video disk and a video tape will be incorporated as recording media. This will be described below assuming that the recording / reproducing device 4 is placed inside the receiving device 3. Of course, a separate recording / reproducing device may be connected outside the receiving device 3.

An information providing station 1 such as a broadcasting station transmits a signal wave modulated by information via a relay station 2 such as a broadcasting satellite. Of course, other transmission methods such as cable transmission, telephone line transmission, and terrestrial broadcast transmission may be used. The signal radio wave received by the receiving device 3 on the receiving side is demodulated into an information signal and then recorded as a signal suitable for recording on the recording / reproducing device 4 as described later. Also, it is sent to the display 5. Here, the user can directly view the information content. The information reproduced by the recording / reproducing device 4 is given to the display 6 via the receiving device 3,
Information such as the original video and audio is viewed. When a removable recording medium on which information is recorded in advance is provided, the reproduction operation after the recording / reproducing apparatus 4 to which the recording medium is attached is performed.
It should be noted that exchange of information between the devices is often performed by digital signals. For example, the receiving device 3 and the display 5 may be connected by analog signals.

FIG. 2 is a block diagram showing an example of the configuration of the information providing station 1 such as a broadcasting station in the above system.
Reference numeral 11 denotes a source generation unit, 12 denotes an encoding circuit that performs compression by the MPEG method or the like, 13 denotes a scramble circuit, 14 denotes a modulation circuit, 15 denotes a transmission antenna, 16 denotes a management information adding circuit, and 17 denotes an input terminal.

Information such as video and audio generated by the source generator 11 including a camera and a recording / reproducing device is compressed by an encoding circuit 12 so that the data amount can be transmitted with a smaller occupied band. Transmission encryption is performed by the scramble circuit 13 as necessary so that only specific viewers can view. After being modulated into a signal suitable for transmission by the modulation circuit 14, the signal is emitted from the transmission antenna 15 as a radio wave to the relay station 2 such as a broadcasting satellite, for example. At this time, the management information adding circuit 16 adds information such as the above-mentioned copy control information and the current time. Although not shown in FIG. 1, request information is input from the input terminal 17 via, for example, a telephone line.
This is used in a system that determines information to be transmitted in response to a viewer request, such as video on demand.

In practice, a plurality of pieces of information are often multiplexed in one radio wave by a method such as time division or spread spectrum. Although not shown in FIG. 2 for simplicity, in this case, there are a plurality of systems including a source generation unit 11 and an encoding circuit 12, and the encoding circuit 12 and the scrambling circuit 13
And a multiplex circuit for multiplexing a plurality of pieces of information.

FIG. 3 is a block diagram showing an example of the configuration of the receiving device 3 in the system of FIG. 301 is RF
/ IF conversion circuit, 302 is a demodulation circuit, 303 is an error correction circuit, 304 is a descramble circuit for decrypting transmission encryption applied to a signal, 305 is a first demultiplex circuit, 306 is an input / output terminal, and 307 is The second demultiplexing circuit, 308 is a decoding circuit, 309 and 310 are output terminals, 311 is a control circuit of the entire receiving device 3, 312 is an information management circuit, 313 is a billing information management circuit, 314 is a modem (MODEM) circuit. 315 is an output terminal, 316 is an input terminal, and 317 is a command input circuit. 313,
The constituent elements 314 and 315 may be removed when billing information is not transmitted as described later. In the figure, the solid line indicates the flow of main information such as video and audio, and the dotted line indicates the flow of control signal information between components.

First, with respect to the components 301 to 310, the flow of information such as video and audio indicated by solid lines will be described. Radio waves from a relay station such as a broadcasting satellite are input to the RF / IF conversion circuit 301. Where RF
The radio wave of the band is frequency-converted into an IF band (Intermediate Frequency), and becomes a signal of a certain band independent of the reception channel. The demodulation circuit 302 demodulates the modulation operation performed for transmission. Further, the error correction circuit 303
After a code error occurring during transmission is detected and corrected, the descrambling circuit 304 decrypts the transmission code. Thereafter, it is sent to the first and second demultiplexing circuits 305 and 307. As described above, particularly in the case of digital broadcasting, a plurality of pieces of information are often multiplexed in one channel by a method such as time division or spread spectrum. The demultiplexing circuit separates only desired information from this. The reason why the first and the second and the two are provided is not only to enable so-called back program recording, but also to remove information that is not worth recording in the first demultiplex circuit 305. In other words, the information often includes additional information such as a weather forecast and a broadcast schedule of a program, which is good for viewing at the time of broadcasting, but is not worth recording and viewing at a later date. It is possible to remove it.

The output of the first demultiplex circuit 305 is supplied to an input / output terminal 306, and exchanges signals with the recording / reproducing device 4 connected thereto. The input / output terminal 306 is a bidirectional terminal, and exchanges information to be recorded / reproduced with the recording / reproducing device 4 by digital data, for example. Of course, one information line does not necessarily have to be bidirectional, and may be composed of a plurality of unidirectional or bidirectional information lines. Generally IEEE 139
Connections according to the four standards are often used. The second demultiplexing circuit 307 has a descrambling circuit 30.
4 or the information reproduced by the recording / reproducing device 4 from the input / output terminal 306 is connected.
Any of the information to be viewed is selected, and desired information is separated. In the next decoding circuit 308, the data compression of the moving image performed before transmission is decoded, and the output terminal 3
09 to the external display 5. Two output terminals 309 and 310 are provided, one of which may be a digital output and the other may be an analog output.

Next, a control signal indicated by a dotted line will be described. The control circuit 311 determines from the above 301 to 305, 3
Control signals are transmitted and received between the components 07 and 308, and the entire receiving device 3 is controlled so as to perform a desired operation. The information management circuit 312 supplies management data when the control circuit 311 performs control, as required. For example,
Here, information on the reception contract is managed. When the user specifies a channel to be viewed, this specification is made to input terminal 3
16 and sent to the control circuit 311 via the command input circuit 317. The control circuit 311 requests the information management circuit 312 for reception contract information. When it is determined that there is a contract with the channel specified by the user, a control signal is sent to each of the above-described components to instruct a receiving operation of the channel. The information management circuit 312 manages timer reservation information by the user. At the time when the viewing is reserved, the control circuit 311 sends a control signal to each of the above-described components to start the receiving operation.

The control circuit 311 also exchanges control signals with the charging information management circuit 313. The charging information management circuit 313 stores charging information for pay broadcasting, and when charging for a user occurs, this information is given to the modem circuit 314. Here, the information is output to an output terminal 315 as information suitable for transmission to a communication transmission line such as a telephone line. Thereafter, the information is sent to a copyright holder, a financial institution, or the information providing station 1 shown in FIG. 1 via a communication transmission path so that a prescribed amount can be obtained from the user. Of course, the communication transmission path may be wireless.

FIG. 4 is a block diagram showing an example of the configuration of a control information signal recorded on a recording medium by the recording / reproducing apparatus 4 of FIG. 1 in the present embodiment. This is formed by adding or rewriting information by a recording / reproducing device or the like to the control information generated and transmitted by the management information providing circuit 16 of the information providing station 1 in FIG. For example, in the case of a tape medium, it is sufficient to record one piece on one recording track, but it is naturally recorded in a fixed relationship with information data such as video and audio, so that it can be easily separated at the time of reproduction.

The program number 100 indicates the number of the program on the medium. The sector information 101 is
This is the number of a sector obtained by dividing the program into predetermined units. The division may be performed in fixed units, for example, in units of 2 kbytes, or may be performed in fixed units of information, for example, in units of division when encoding. The number may be assigned in the program or may be a serial number for the entire recording medium. Information such as the recording time 107 described later is added in units of this sector. The time information 102 indicates how long the recorded portion has passed since the start of the program. The type 103 indicates attribute information such as whether the program is sold, rented, self-made, or broadcast.

The copy control 104 is important in the present invention, and indicates whether the information can be recorded on a medium. In general, Copy Never (copy prohibited), Copy
OneGeneration (copy only one generation), Copy N
o More (copied once by Copy One Generation, no more can be copied), Copy Free (copy is allowed).

Copy Never, Copy One Generation, Copy
The designation of Free is determined by the copyright holder, such as the creator of the information, by selecting any one of the three, and is often given by the management information adding circuit 16 described above in broadcasting. If the information software is provided on a recording medium, the right holder records it at the time of creation. Copy No More was originally Copy One Ge
It was rewritten in this way when copying what was a neration. Since there are four states in total,
It can be transmitted with 2-bit information. Copy Never is (1,
1), Copy One Generation is (1, 0), Copy No Mo
re is (0, 1) and Copyfree is (0, 0).

Copy Never cannot be recorded, and Copy One Gene
The ration is recorded as rewritten as Copy No More, so basically on the recording medium, Copy No More and Copy Free
There are two possible states. In addition, called temporary record,
It has also been proposed by the present applicant to conditionally record copy prohibition information, but the description is omitted here.

The APS 105 is copy control information to an analog recording device (APS; Analogue Protection System).
And controls whether copying is possible by adding a pseudo sync pulse to the analog video signal or the like.

The retransmission control 106 is important in the present invention. This indicates whether or not to permit transmission and transfer of information again via the Internet or the like as described above. Alternatively, in order to achieve this purpose, when recording information on a medium, it may indicate whether or not the information needs to be encrypted. This is also often provided by the management information providing circuit 16 in broadcasting. If the information software is provided on a recording medium, the right holder records it at the time of creation.

How the recording on the medium is controlled by the combination of the copy control 104 and the retransmission control 106 will be described. When the copy control 104 is Copy Never, recording other than what is called temporary recording is prohibited. In this case, the retransmission control 106 has no particular meaning. Copy One
In Generation, encryption is performed at the time of recording, and information is retransmitted according to the retransmission control 106. Copy Free was generally interpreted as not requiring strict controls and was previously recorded unencrypted. In the present invention, encryption is performed according to the retransmission control 106. As will be described later, if encryption is performed in addition to the display simply prohibiting retransmission, even if retransmitted, it becomes difficult to view the contents, and a positive blocking effect can be expected.

The recording time 107 records, for example, the time given by the management information providing circuit 16 in FIG. The recording at the recording time 107 is performed, for example, in sector units. The broadcast method 108 is a format for HD information (HD; High Definition;
This indicates a broadcasting system used by the information, such as high definition) and SD information (SD; Standard Definition).
The encryption 109 indicates whether or not the recorded information has been encrypted. The user identification 110 is recorded when a user-specific code is used so that the information recorded on the medium can be reproduced only by the same device or the same user as at the time of recording.

The encrypted information 111 is used when reproducing the information recorded by encryption and decrypting the encryption. When the data amount of the information itself is large, a code number may be recorded, and the corresponding information stored in advance in the reproducing apparatus may be used.

The above is recorded at relatively small time intervals, such as for each frame of a video or for a fixed amount of data as required. Of the components described above, in particular, 103 to 1
In the case of broadcasting, what is indicated by 08 is often added in advance on the transmitting side. The configuration of the control information signal shown in FIG. 4 is an example, and various configurations such as the configuration, the recording position on the medium, and the frequency are applicable. In the present invention, all of the contents are not essential, and some of them may be omitted. Of course, the order is not limited to this.

The recording positions of these control signals on the medium will be described with reference to FIG. FIG. 5 schematically illustrates recording positions of a control information signal and information data such as video and audio on a recording medium. In the figure, (a) is suitable for a tape medium. In this case, it is desired that a block of the control signal is provided, for example, for each recording track. Therefore, for each track, a block of control information is arranged in, for example, a header portion thereof prior to information such as video and audio. (b) is suitable for a digital video disc or the like. In this case, it is desired that each sector has a certain amount of information. Therefore, each sector is arranged in its header section or the like. (c) is suitable for a hard disk or the like. In this case, the information such as video and audio and the control information are preferably recorded at separate positions on the disk so that the entire control information can be read within a short time at the time of startup.

Next, referring to FIG. 6 and FIG.
And the operation of encryption according to the present invention will be described. First, the recording / reproducing apparatus 4 directly records a digital transmission or broadcast compressed bit stream as it is. A recording apparatus mainly based on a recent or future digital recording method is suitable. In this case, the transmission and reception of information with the receiving device 3 may be performed digitally according to the IEEE 1394 standard or the like as described above. Further, the recording medium is not limited to a tape, and various kinds of media such as a removable disk such as a digital video disk and a disk built in a device such as a hard disk are possible.

FIG. 6 is a circuit block diagram of the recording / reproducing apparatus 4. Particularly, it is suitable for a recording medium using a disk. 41 is a recording circuit, 4101 is an input terminal of a signal to be recorded, 4102 is a storage means such as a semiconductor memory,
4103 is an encryption circuit, 4104 is an input terminal of an encryption key, 4105 is a recording / encoding circuit, 4106 is an output terminal of a signal to be recorded on a recording medium, 4107 is a medium detection circuit,
108 is a control detection circuit, 4109 is a recording control circuit, 41
Reference numeral 10 denotes a control signal input / output terminal, and reference numeral 4111 denotes a control signal output terminal. Reference numeral 42 denotes a reproduction circuit, 4201 denotes a reproduction signal input terminal, 4202 denotes a reproduction / decoding circuit, 4203 denotes a block reproduction circuit, 4204 denotes a storage means such as a semiconductor memory, 4205 denotes an error correction circuit, 4206 denotes an encryption / decryption circuit, and 4207 denotes Input terminal for key for decrypting encryption, 420
8 is a signal output circuit, 4209 is an output terminal for sending a reproduction signal to a receiver or the like, 4210 is a control signal detection circuit, 421
1 is a clock, 4212 is a reproduction control circuit, 4213 is a control signal input / output terminal, and 4214 is a control signal output terminal.

FIG. 7 is a block diagram showing the periphery of the recording medium of the recording / reproducing apparatus. 43 is a recording / reproducing unit, 4301 is an input terminal, 4302 is a recording amplifier, 4303 is a recording medium drive on which a recording medium such as a hard disk, digital video disk, or video tape is mounted, 4304 is a reproducing amplifier, 4305 is an output terminal, and 4306 is a mechanism. A control circuit 4307 is an input terminal.

First, the operation will be described with reference to FIG. The recording circuit 41 will be described first. Information to be recorded is input from an input terminal 4101. This is supplied from the input / output terminal 306 in FIG. The information after the transmission cipher is decrypted by the descrambling circuit 304 is of course within the scope of the present invention. Note that the output of the output terminal 4209 of the information reproduced by the reproduction circuit 42 described later is also performed by the input / output terminal 306 of FIG.
Given to. Therefore, 4101 and 4209 may be combined into one and used as an input / output terminal. Of course, this does not necessarily mean that there is only one signal line, but may be a plurality of unidirectional or bidirectional signal lines. IEEE 1394
It may be specified by a standard.

The input information is temporarily stored in the storage unit 410.
2 is stored for each block. In addition to digital information such as video and audio, various control information such as that shown in FIG. In the case of broadcasting, for example, it is provided by the management information providing circuit 16 in FIG.
This is given to the control detection circuit 4108, and includes the above-described copy control 104 and retransmission control 106, for example, as shown in FIG.
The control information as indicated by is detected. On the basis of this, the recording control circuit 4109 determines whether or not this signal can be recorded, whether or not to encrypt the signal at the time of recording, and the like.
Send to 5.

On the other hand, information such as video and audio in the storage means 4102 is stored in the encryption control circuit 4103 in the recording control circuit 4102.
According to the control signal from 109, encryption is performed as needed. The encryption is performed based on information from input terminal 4104, for example. This is a device key such as an identification number of the device, a user key such as a personal ID read by attaching an IC card possessed by the user to the device, or a content generated randomly for each information (content) to be recorded. A key or the like is used.

FIG. 9 is a circuit block diagram showing one configuration example of the encryption circuit 4103. 41031 is an input terminal, 41032 is a first encryption circuit, 41033 is a second encryption circuit, 41034 is a multiplexing circuit, 41035 is an input terminal, and 41036 is an output terminal. Input terminal 410
4 is the same as that shown in FIG. The above-mentioned content key input from here is used as the first encryption circuit 4103.
2 and the second encryption circuit 41033. Information to the input terminal 41031 is provided from the storage unit 4102 in FIG. 6, and is encrypted by the first encryption circuit 41032 based on the content key. On the other hand, the input terminal 41
The device key is given from 035 and sent to the second encryption circuit 41033. The content key is encrypted by the second encryption circuit 41033 based on the device key. This is multiplexed with the previous information by the multiplexing circuit 41034, that is, stored in the encrypted information 111 of FIG. Therefore, the information to be recorded is output to the output terminal 410 together with the key information.
36 to the recording encoding circuit 4105 in FIG.
In this way, the content key can be decrypted only by the determined device, and the information can be decrypted and viewed, so that the use of an unspecified number of people can be prevented.

In some cases, for example, when the recorded information is reproduced and the viewing period is restricted, it is required to delete the recorded information after the expiration date. The purpose can be achieved only by erasing the set content key, and the operation can be simplified. The encryption may be performed in units of a program (content), but may be performed in the same content by changing the key over time, for example, by changing the key in sector units.

According to the above embodiment, information recorded on a disk or the like is reproduced by the device, or information recorded on a removable disk or the like is reproduced by a disk drive of a personal computer and transmitted again via the Internet or the like. If this happens against the will of the copyright owner, other devices or users will have difficulty viewing.

The encrypted information is sent to a recording encoding circuit 41
05. In the recording encoding circuit 4105, based on the control information from the recording control circuit 4109, if the recording is prohibited, the information is cut off here. If the recording is permitted, modulation suitable for the medium to be used is performed. Output to Copy control information is Copy Never or Copy NoMor
If e, information is blocked here. If it is Copy Free, it is modulated as it is and sent to the output terminal 4106. In the case of Copy One Generation, this recording control information is copied by the recording encoding circuit 4105 to Copy No More.
Is modulated, and sent to the output terminal 4106.

From the recording control circuit 4109 to the recording encoding circuit 4105, in addition to the copy control information, a clock 4211
The current time at the time of recording output from is also given. If recording is possible, this is also recorded at the same time as necessary. It is used when playing back recorded information and setting a time limit for the period of viewing. If the current time is included in the received information, it may be used,
Further, the clock 4211 may be calibrated with the received information.

The recording / encoding circuit 4105 sets the encryption information 109 in FIG. 4 to “1” when encryption is performed, and to “0” when encryption is not performed. In this manner, it is possible to easily determine whether or not decryption is required for reproduction.

Further, the information signal at the output terminal 4106 is
This is supplied to the input terminal 4301 of the recording / reproducing unit 43 shown in FIG. This is amplified by a recording amplifier 4302 so that a laser generating element and a magnetic head can be driven, and then recorded on a recording medium as described above by a recording medium drive 4303. Reference numeral 4306 denotes a mechanism control circuit such as a motor for driving the recording medium drive 4303, and an input terminal 4307
The recording medium is controlled by the control signal from the CPU.

The recording control circuit 4 shown in FIG.
The output of 109 is provided to an output terminal 4111.
If necessary, this may be provided to the input terminal 4307 in FIG. 7 to instruct the mechanism control circuit 4306 to stop the recording operation, for example, when information for which recording is prohibited is input. The input / output terminal 4110 in FIG. 6 inputs and outputs control signals to and from an external device. For example, without detecting the control information described above with the control detection circuit 4108,
There is also a method of providing data externally separately from data such as video and audio, and is used in this case. According to the IEEE 1394 standard, it can be shared with the input terminals 4101 and 4209.

Next, the operation when reproducing the recorded information will be described. The information signal reproduced from the recording medium drive 4303 shown in FIG. 7 is amplified by a reproduction amplifier 4304 to a level at which signal processing can be performed in a subsequent stage, and then output to an output terminal 4305.
Output to The control signal from the output terminal 4214 in FIG.
06 is controlled. This is generated by the reproduction control circuit 4212. Usually, the recording control circuit 4109 and the reproduction control circuit 4212 are actually on the same semiconductor device. In this case, 4111 and 421
4 can be commonly used.

The information signal at the output terminal 4305 in FIG. 7 is given to the input terminal 4201 of the reproduction circuit 42 in FIG. This is supplied to the reproduction / decoding circuit 4202. Here, the modulation performed on the recording side for recording and reproducing on the medium is demodulated,
The waveform is equalized and the data is determined by the clock. Next, a synchronization signal, an ID signal, and the like are detected by the block reproduction circuit 4203, and the reproduction data is temporarily stored in a predetermined position of the storage unit 4204 based on the detection. The error correction circuit 4205 detects an error in the code generated in the recording / reproducing process by a calculation operation from the stored data, and corrects the error to a correct value. The data after the error correction is provided to the encryption / decryption circuit 4206. This was performed by the encryption circuit 4103 at the time of recording.
This is for decrypting the recording encryption. Here, decryption is performed using the device key of the apparatus from the input terminal 4207, a user key such as a personal ID, or a content key. If this is not a predetermined one, normal encryption is not decrypted and cannot be viewed. Therefore,
The recorded device or user can view it, but after attaching the recorded medium to a disk drive of a personal computer, retransmitting it over the Internet, etc., and distributing it to a third party, Will be reproduced, and it will be extremely difficult to watch.
Thus, one object of the present invention can be achieved. Note that the decryption key from the input terminal 4207 is stored in the storage medium shown in FIG.
May be obtained from the encrypted information 111, or may be obtained by decrypting the code therefrom.

On the other hand, the control signal detection circuit 4210 detects, for example, copy control information, recording time, and the like from the error-corrected data. Next, the reproduction control circuit 4212 determines whether or not reproduction output is possible, based on the detected information and the current time from the clock 4211, and controls the output of the signal output circuit 4208.
Alternatively, the encryption / decryption circuit 4206 is operated or stopped. For example, there is a time limit for playback and viewing,
If this has passed, and the copy control information is Copy
If it can be determined that the information has been recorded by an illegal method, for example, by indicating One Generation, the signal output circuit 4208 does not output at least information that can be normally viewed. If necessary, control information is sent from the output terminal 4214 to the input terminal 4307 in FIG.
The reproduction operation of 03 itself may be stopped.

When it is recognized that the reproduced information is to be output, this information is supplied to the output terminal 4209 and supplied to the display 5 via the receiving device 3 of FIG. The compression operation of the data amount by the MPEG or the like performed by the encoding circuit 12 of FIG.
At 08, it is restored. Therefore, the user can view the information content. The decoding circuit 308 may be built in the display 5.

When the copy control information and the like are embedded in the video information as a digital watermark unlike the above-described ones, the same control is performed during reproduction by using the information detected from the digital watermark. May be.

The clock 4211 naturally requires a certain degree of accuracy. Anything that can be easily changed by the malicious intent of the user serves no purpose. It is desirable that the information be controlled by time information from a broadcast station or the like. When the time is intentionally changed, the device may not operate thereafter.

An input / output terminal 4213 is for transmitting and receiving control information to and from an external device. For example, it is utilized when the reproduced information is further recorded on an external recording device. The input / output terminals 4110 and 4213 can be shared. In addition, for example, according to the IEEE 1394 standard, transmission and reception can be performed by one system including information on the input terminal 4101 and the output terminal 4209, or can be performed wirelessly using infrared rays or the like.

The control signal supplied from the reproduction control circuit 4212 to the recording / encoding circuit 4105 is, for example, an instruction for erasing information at the time of reproduction. Although this is not directly related to the present invention, it may be required to limit the number of times of reproduction to one and to erase after reproduction. At this time, in accordance with the control signal, the recording encoding circuit 4105 generates a signal having no meaning as information, and erases the information by recording it on a medium. In this case, the recording medium must be erasable. The medium detection circuit 4107 is provided for this purpose, and prevents the above-mentioned information from being recorded on or reproduced from a medium such as a CD-R where the recorded information cannot be erased. .

The above is the description of the basic operation of FIGS. 6 and 7. Here, in the present invention, in particular, the recording encryption circuit 41
Operation 03 is described in further detail. The copy control information detected by the control detection circuit 4108 is (1, 1)
That is, if it is Copy Never, the recording control circuit 4109
Sends a control signal to the recording encoding circuit 4105 to prevent the recording of information on the recording medium. Of course, in this case, the encryption circuit 4103 does not need to perform an encryption operation. In other cases, several operations are possible.

First, the first case will be described. This is a case in which the retransmission control 106 is set to function when Copy Free is set. (0, 0), that is, Copy Free, and the retransmission control 10
6 permits the retransmission via the Internet, the encryption circuit 4103 passes the information to the recording / encoding circuit 4105 without performing the encryption operation. On the other hand, the retransmission control 10 shown in FIG.
If 6 does not permit retransmission on the Internet, the encryption circuit 4103 performs recording encryption, and then passes the information to the recording encoding circuit 4105. In this case, what is recorded on the medium by performing recording encryption, even if this medium is removed and reproduced by a drive of a personal computer and transmitted to the Internet or the like, the encryption is decrypted on the receiving side, It is extremely difficult to watch.

Next, the second case will be described. This is a case where the retransmission control 106 is set to function at the time of Copy One Generation. (1,0) ie Copy One Gene
If it is ration, regardless of the contents of the retransmission control 106, encryption is performed by the encryption circuit 4103, and the copy control information is changed to (0, 1), ie,
Rewrite as Copy No More and record. Retransmission control 106
Is used for the control at the actual retransmission stage.

In the third case, the retransmission control 106
This is the case where it is determined that the function will work for both Free and Copy One Generation. Copy Free (0, 0) information is the same as in the first case, Copy One Generation (1, 0)
Is handled in the same way as in the second case. In any case, the information of the encryption 109 in FIG. 4 is set to, for example, “1” when recording with encryption, and “0” when recording without encryption.

The above description has been made such that 2-bit copy control information and 1-bit reproduction control information are separately recorded on a recording medium. As described above, the copy control information indicates Copy Free on the recording medium (0, 0).
(0, 1) indicating No More Copy. The remaining (1,0) and (1,1) may be used to reduce the number of bits. For example, (0,0) allows retransmission with Copy Free, (1,0) does not allow retransmission with Copy Free, (0,1) allows retransmission with No More Copy,
For (1, 1), retransmission is not allowed with No More Copy. If No More Copy does not allow retransmission at all, set this to (0, 1) and only for Copy Free,
It is preferable to provide the above two cases. In any case,
The number of bits can be reduced.

Next, another embodiment of the receiving apparatus 3 using the present invention will be described with reference to FIG. 3 is different from the embodiment of FIG. 3 in that an encryption circuit 318 and a decryption circuit 319 are added, and a signal is input from, for example, an input / output terminal 306 via a modem circuit 314 and an output terminal 315 (here also an input terminal). The playback information of the recording and playback device 4 is configured to be transmitted to the Internet or the like via a telephone line or the like. Therefore, in this case, the receiving device 3 in FIG. 8 has a function as a transmitting / receiving device. The communication line may be wireless. Here, the control circuit 311 performs detection of control information as shown in FIG. 4 and control based on the control information.

The reproduction information of the recording / reproducing device 4 input from the input / output terminal 306 includes the copy control 10 described above.
4, control information such as retransmission control 106 is attached. The encryption applied at the time of recording has already been decrypted. Since the information is reproduction information, the copy control 104 sets Copy Free (0, 0).
Or Copy No More (0, 1).

The case where the relationship between the copy control 104 and the retransmission control 106 is the first case described above will be described first. Co
If it is py Free (0, 0) and the retransmission control 106 permits retransmission on the Internet, the encryption circuit 318 sends information via the modem circuit 314 and the output terminal 315. At this time, the encryption operation need not be performed. on the other hand,
If the retransmission control 106 does not permit retransmission on the Internet, the encryption circuit 318 stops operating, and here shuts off the information signal.

Next, the copy control 104 and the retransmission control 106
Is the second case described above.
If the copy control 104 is Copy No More (0, 1) and the retransmission control 106 permits retransmission on the Internet, the encryption circuit 318 outputs the modem circuit 314 and the output terminal 3
The information is sent out via 15. At this time, an encryption operation is performed. On the other hand, if the retransmission control 106 does not permit retransmission on the Internet, the encryption circuit 318 stops operating and interrupts the information signal here.

In the third case described above, the information of (0,0) is handled in the same manner as the first case, and the information of (0,1) is handled in the same manner as the second case.

The decoding circuit 319 in FIG. 8 is used when the receiving device 3 receives information via the Internet or the like. When the information is encrypted, the information is decrypted and sent to the decoding circuit 308 according to a command from the control circuit 311 so that the information can be viewed on the external display 5. in this case,
Of course, a key for decrypting the encryption is required.

The above description relates to the case where the reproduction information of the recording / reproducing device 4 is input from the input / output terminal 306 and is retransmitted. However, the present invention is not limited to this. The same applies to the case where information received from the output terminal 315 is retransmitted.

[0070]

As described above, according to the present invention, the control information transmitted along with the information such as video and audio uses the information of the retransmission control 106 in addition to the copy control information 104 to encrypt the information at the time of recording. And control whether the Internet retransmission is possible. As a result, it is possible to control copy that reflects the intention of the copyright holder and control retransmission to a communication line such as the Internet. For this reason, where the right holder does not know,
This has the effect of eliminating the problem of mass distribution of high quality copies.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an entire digital information transmission / reception recording system to which the present invention is applied.

FIG. 2 is a block diagram showing an example of the configuration of an information providing station 1 (transmitting device) in FIG.

FIG. 3 is a block diagram showing an example of a configuration of a receiving device 3 in FIG. 1;

FIG. 4 is a block diagram showing an example of a configuration of a control information signal according to the present invention.

FIG. 5 is a diagram showing recording positions of a control information signal and information data on a recording medium. (A) is an example of a tape, (b) is an example of a video disk, and (c) is an example of a hard disk.

FIG. 6 is a block diagram showing an example of the configuration of the recording / reproducing device 4 in FIG.

FIG. 7 is a block diagram showing the periphery of a recording medium of the recording / reproducing apparatus of FIG. 6;

FIG. 8 is a block diagram showing an example of a configuration of a receiving device 3 in FIG.

FIG. 9 is a block diagram showing an example of a configuration of an encryption circuit 4103 in FIGS. 6 and 8;

[Explanation of symbols]

 1 Information providing station (transmitting device) 16 Management information adding circuit 104 Copy control 106 Retransmission control 109 Encryption 110 User identification 111 ... Encryption information 2 ... Relay station 3 ... Receiving device 314 ... Modem (MODEM) circuit 318 ... Encryption circuit 319 ... Decryption circuit 4 Recording / reproducing device 41 Recording circuit 4103 Encryption circuit 41032 First encryption circuit 41033 Second encryption circuit 4105 Recording / coding circuit 4108 Control detection circuit 4109 Recording control circuit 42 Reproduction circuit 4206 Encryption / decryption circuit 43 Recording / reproduction unit 5 display

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Atsushi Yoshioka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 5C053 FA13 FA20 FA21 FA23 GA11 GB37 JA16 JA22 LA14 5C064 BA01 BB01 BC17 BD02 BD03 BD07 CA14 DA03

Claims (8)

[Claims] 1. A digital information recording apparatus for recording digital information including input video information or audio information on a recording medium, wherein the digital information includes information indicating whether or not recording of the digital information on the recording medium is permitted. Copy control information indicating whether
Retransmission control information indicating whether or not the digital information is allowed to be retransmitted to another device using a wired or wireless communication line, performing predetermined processing on the digital information, and recording the digital information on a recording medium. A recording circuit; a control detection circuit that detects the copy control information and the retransmission control information from the digital information; a recording control circuit that controls a recording operation of the recording circuit based on a detection result of the control detection circuit; An encryption circuit for encrypting digital information to be recorded, wherein the recording control circuit controls the recording operation of the recording circuit according to the copy control information detected by the control detection circuit, and the copy control information records the data. Indicating forgiveness (Copy
Free) and the detected retransmission control information indicates that transmission is permitted again, the encryption control circuit is not operated, and the copy control information indicates that recording is permitted (Copy).
Digital information recording apparatus, wherein the digital information to be recorded is encrypted by the encryption circuit if the retransmission control information is Free and the detected retransmission control information indicates that transmission is not permitted again. 2. A digital information recording apparatus for recording digital information including input video information or audio information on a recording medium, wherein whether or not the digital information is permitted to be recorded on the recording medium. Copy control information indicating whether
Retransmission control information indicating whether or not the digital information is allowed to be retransmitted to another device using a wired or wireless communication line, performing predetermined processing on the digital information, and recording the digital information on a recording medium. A recording circuit; a control detection circuit that detects the copy control information and the retransmission control information from the digital information; a recording control circuit that controls a recording operation of the recording circuit based on a detection result of the control detection circuit; An encryption circuit for encrypting digital information to be recorded, wherein the recording control circuit controls the recording operation of the recording circuit according to the copy control information detected by the control detection circuit, and the copy control information is generated for one generation. Only one that indicates that only recording is permitted (Copy One Generation)
A digital information recording device for encrypting digital information to be recorded by the encryption circuit, irrespective of detected retransmission control information. 3. The digital information recording apparatus according to claim 1, wherein the recording circuit includes the detected retransmission control information,
A digital information recording device for recording on the recording medium. 4. The digital information recording device according to claim 1, wherein said encryption circuit includes a first encryption circuit for encrypting digital information based on a content key generated in a random number. , Based on a device key assigned to each recording device,
Digital information having a second encryption circuit for encrypting the content key, wherein an output of the first encryption circuit and an output of the second encryption circuit are recorded on a recording medium Recording device. 5. The digital information recording apparatus according to claim 1, wherein the recording circuit records the digital information to be recorded on the recording medium, including information indicating whether or not the digital information to be recorded has been encrypted. A digital information recording device characterized by the above-mentioned. 6. A digital information transmitting apparatus for transmitting digital information including video information or audio information to a receiving apparatus, wherein copy control information indicating whether or not recording of the digital information on a recording medium is permitted. And the retransmission control information indicating whether the receiving device allows the received digital information to be retransmitted to another device using a wired or wireless communication line. A digital information transmitting device comprising a transmitting circuit for transmitting. 7. A digital information transmitting / receiving apparatus for receiving or inputting digital information including video information or audio information and transmitting the digital information again to an external device using a wired or wireless communication line. Includes copy control information indicating whether to permit recording of the digital information on a recording medium,
Retransmission control information indicating whether or not the digital information is allowed to be retransmitted to another device using a wired or wireless communication line, and performs predetermined processing on the digital information and retransmits the digital information to an external device. A transmission circuit for detecting the copy control information and the retransmission control information from the digital information; and an encryption circuit for encrypting the digital information to be retransmitted. Indicates that transmission is permitted again, if the digital information to be transmitted again is encrypted by the encryption circuit and transmitted again by the transmission circuit, and if the detected retransmission control information indicates that transmission is not permitted again, And a digital information transmitting / receiving apparatus which does not transmit again by the transmitting circuit. 8. The digital information transmitting and receiving apparatus according to claim 7, wherein the detected copy control information is permitted to be recorded (Copy Free), and the encryption by the encryption circuit is not performed. A digital information transmitting / receiving apparatus characterized by the above-mentioned.