JPH1155618A - Home network - Google Patents

Abstract

(57) [Problem] To provide a home capable of recording broadcasted digital contents while protecting the copyright thereof without providing a recording device with a complicated mechanism for detecting copyrighted information. Provide a network. SOLUTION: Copyright information is embedded in the digital content which is the content of the digital broadcast program, and a copy control signal for copy-controlling the digital content is created based on the copyright information.
a set-top box 11 having a ter Mark detector 15 for transmitting the digital content and the copy control signal; and a copy control signal detecting means 16 for extracting the copyright information described in the copy control signal. A digital VCR 13 for recording the digital content in accordance with the copyright information;
And a digital VDR 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home network for recording video and audio contents broadcast with embedded copyright information while protecting the copyright based on the copyright information. It is.

[0002]

2. Description of the Related Art In some cases, a copy control signal is attached to a digital satellite broadcast program or a video / audio content stored in a recording medium. This copy control signal is, for example, CGMS (Copy Generat
Ion Management System) means a bit, and represents information such as unlimited copy, one-time copy permitted, and copy prohibited, in a bit pattern. This CGMS mechanism has been put to practical use in a DVC (Digital Video Cassette). However, since the copy control signal is simply attached to the content, it is relatively easy to falsify.

A method has been proposed in which information described as the copy control signal is embedded in the content as a Water Mark. Wat above
The erMark is an electronic "watermark" embedded in an image or sound. The information to be embedded in the content as the Water Mark is, in addition to the information described as the copy control signal, the copyright owner and the copyright owner. There is copyright information indicating the genre of copyright and other information. It is difficult to easily remove the Water Mark from the content, and if it is forcibly removed, the Water Mark is configured to significantly degrade images and sounds.

[0004] Therefore, as compared with the case where the copy control signal is attached to the content, a Water M that can more reliably protect the copyright.
It is desired that a method of embedding the information described in the copy control signal in the content in the form of an ark into the content be put to practical use.

FIG. 7 is a block diagram showing an example of the configuration of a conventional home network. In FIG. 7, reference numeral 101 denotes a set-top box which is a receiving terminal device for receiving digital satellite broadcasts and transmitting the digital contents.
102 is a digital TV, 103 is a digital video cassette recorder (hereinafter abbreviated as digital VCR), 1
Reference numeral 04 denotes a digital video disc recorder (hereinafter abbreviated as digital VDR), and reference numeral 105 denotes a Water Mark detector for detecting copyright information as Water Mark embedded in digital content.

In operation, a digital satellite broadcast is received by the set-top box 101, and the digital content, which is the content of the digital satellite broadcast, is transmitted to a digital T
V102, digital VCR103, or digital VCR
It is sent to the DR 104. In the recording device of the digital VCR 103 and the digital VDR 104, a Water Mark detector 105 provided in the recording device has a WaterMark embedded in the digital content transmitted from the set-top box 101.
As copyright information. Specifically, the above W
From the copyright information as the after Mark, a copy control signal in which information for controlling / restricting copying is described is extracted. If the copy control signal describes "unlimited copy", that is, the digital content may be copied, the digital content is recorded. If the copy control signal describes "copy prohibited", the copyright is protected. Therefore, the digital content is not recorded.

As described above, the copyright information is
In order for the digital content embedded as a mark to be sent from the set-top box to the recording device and recorded while protecting the copyright, it is necessary to individually connect the set-top box to a digital VCR or digital VDR connected by a digital bus. Wat to each recording device
An er Mark detection mechanism is required.

[0008]

However, since the above-described Water Mark detection mechanism requires a complicated circuit, a device such as a VTR equipped with such a Water Mark detection mechanism becomes expensive. There is a problem. Also, when the Water Mark system is changed, if a plurality of recording devices are connected by a digital bus, the Water M
ark detector needs to be updated, and new Wa
It cannot support the ter Mark method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is not necessary for a recording apparatus to have a complicated mechanism for detecting copyrighted information, and the copyright of digital contents transmitted by a digital bus is not required. It is an object of the present invention to provide a home network capable of recording data while protecting the data.

[0010]

In order to solve the above-mentioned problems, a home network according to the present invention (claim 1) comprises a home network in which devices for receiving and recording digital broadcast programs are connected by a digital bus. Means for creating a copy control signal for copy-controlling the digital content based on the copyrighted information, wherein the copyrighted information is embedded in the digital content which is the content of the digital broadcast program. A receiving device that sends out the digital content and the copy control signal; and a copy control signal detecting unit that extracts the copyright information described in the copy control signal, according to the copyright information. And a recording device for recording the digital content.

A home network according to the present invention (claim 2) is a home network in which devices for receiving and recording digital broadcast programs are connected by a digital bus. Copyright information is embedded in a certain digital content, and a device for transmitting the digital content, a unit for detecting the copyright information in the digital content, and an operation state of a recording device for recording the digital content. A device operation state monitoring means for monitoring, a control means for determining operation control of the recording apparatus based on the copyright information and the operation state, and a device control command generation means for generating a control command according to the determination. Copyright management for controlling the operation of the recording apparatus in accordance with the control command And location, is made of a recording apparatus for recording the digital content according to the control command.

A home network according to the present invention (claim 3) is a home network in which a device for receiving and recording a digital broadcast program is connected by a digital bus. A copy control signal is attached to a certain digital content, an apparatus for transmitting the digital content, copy control signal detecting means for detecting copyright information described in the copy control signal attached to the digital content, Device operating state monitoring means for monitoring the operating state of the recording apparatus for recording digital content; control means for determining operation control of the recording apparatus based on the copyright information and the operating state; and control according to the determination Device control command generation means for generating a command. And copyright management apparatus that controls the operation of the recording apparatus according to command, is made of a recording apparatus for recording the digital content according to the control command.

[0013] Further, in the home network according to the present invention (claim 4), in the home network according to claim 1 or 2, the copyright information is such that the digital content is a digital content.
Mark (digital watermark) is embedded.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a home network according to Embodiment 1 of the present invention. In the figure, reference numeral 11 denotes a set-top box, which is a device for receiving digital satellite broadcasts and transmitting the digital contents to a VTR or the like. 12 is a digital TV,
13 is a digital VCR, 14 is a digital VDR, 1
Reference numeral 5 denotes a Water Mark detector, which is installed in the set-top box 11 and generates a copy control signal 18 from the copyright information as the Water Mark embedded in the digital content. 16
Is a copy control signal detector,
The copyright detector described in the copy control signal 18 generated by the mark detector 15 is detected. Reference numeral 17 denotes digital content in which a Water Mark is embedded. 18 is a copy control signal,
The copyright information for copy control is described. 4
Reference numeral 0 denotes a digital bus, which includes a set top box 11, a digital TV 12,
A digital VCR 33 and a digital VDR 34 are connected.

The configuration of the set-top box 11 will be described with reference to FIG. 2, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Reference numeral 20 denotes a receiving / demodulating unit for demodulating a digital compressed signal input at a high frequency in digital satellite broadcasting and extracting a bit stream 51. Reference numeral 21 denotes whether a received digital satellite broadcasting channel is a channel to which the user has subscribed. The conditional access control unit 22 determines whether the video bit stream 52 and the audio bit stream 53 are output from the bit stream 51 extracted by the reception demodulation unit 20 and output via the conditional access control unit 21. A demultiplexer 23, a video decoder for expanding a video bit stream output from the demultiplexer 22 into an image signal,
Reference numeral 24 denotes an audio decoder for expanding the audio bit stream output from the demultiplexer 22 into an audio signal.
Is a copy control signal generator for generating a copy control signal 18 based on the copyright information detected by the Water Mark detector 15, 26 is a digital interface, 27 is a digital image signal output from the video decoder 23, And a digital-to-analog converter for converting an audio signal output from the audio decoder 24 into an analog signal and outputting the analog signal; 51, a bit stream including a video bit stream and an audio bit stream; 52, a video bit stream; It is a bit stream.

Next, the operation of FIGS. 1 and 2 will be described together. First, a digital satellite broadcast is received by the set-top box 11, and the water content embedded in the digital content, which is the content of the digital satellite broadcast, is received.
The Mark is detected, and the copy control signal 18 is extracted from the copyright information as the Water Mark. This process will be described in more detail with reference to FIG. 2. The reception / demodulation unit 20 demodulates the high-frequency input digital compressed signal of digital satellite broadcasting, extracts the bit stream 51, and the conditional access control unit 21 outputs the bit stream 51. From this, it is determined whether or not the received channel of the digital satellite broadcast is a channel to which the user has subscribed. If the channel is to be subscribed, the reception is continued and the bit stream 51 is output to the demultiplexer 22,
If not, the bit stream 51 is stopped and is not output to the demultiplexer 22. Next, the video bit stream 52 and the audio bit stream 53 separated from the extracted bit stream 51 by the demultiplexer 22 are expanded into an image signal and an audio signal by the video decoder 23 and the audio decoder 24, respectively. You. Water detected by the Water Mark detector 15 and embedded in the image or audio signal
From the Mark, the copy control signal generator 25 generates a copy control signal 18 based on the copyright information 28 for copy control described in the copyright protection signal by the Water Mark, and outputs it to the digital interface 26. . On the other hand, Water Mar
k, a digital content 17 including an image bit stream 52 and an audio bit stream 53
Are transmitted through the digital interface 26 in the compressed state to the digital TV 12 and the digital VCR 1.
3, and output to the digital VDR 14. The digital interface 26 controls the copy control signal 18
At the same time, if there is other data included in the bit stream 51 output from the conditional access control unit 21, the data is also transmitted to the digital TV 12, the digital VC
R13, output to digital VDR14. Also, Wa
When digital image signals and audio signals, which are digital contents 17 including ter Marks, are output to an analog TV, they are converted into analog signals by a D / A converter 27 and output from analog TVs 55 and 56, respectively. Is output to In this way, from the output 57 of the set-top box 11 shown in FIG. 2, the image signal, the audio signal, and the copy control signal 18 and other data if present are output. Since other data is not essential in the first embodiment, it is omitted from the following description. As described above, the image signal and the audio signal are digital contents 17 including a Water Mark, and in FIG.
Digital content 1 containing ater Mark
7 and the copy control signal 18 are transmitted from the set-top box 11 to the digital TV 12, the digital VC
It is sent to R13 or digital VDR14. In the recording device of the digital VCR 13 and the digital VDR 14, the copy control signal 18 is separated from the digital content 17 including the Water Mark and the copy control signal 18 by the copy control signal detector 16 provided in the recording device. The copyright information described in the copy control signal 18 is detected. The digital VCR 13 and the digital VDR 14 operate in accordance with the above copyright information,
The image signal and the audio signal are recorded or not recorded. For example, if the copyrighted information is described as "unrestricted copy" and the digital content may be copied, the digital content is recorded or described as "copy impossible" and the digital content is copied. If copying is not allowed, the digital content is not recorded to protect copyright.

Here, in the description of the above operation, the case where the copyright information 28 for copy control described in the copy control signal 18 is included in the copyright protection signal by Water Mark has been described. If the copy control signal 18 is attached to the digital content itself, the set top box 11
It is not necessary to generate the copy control signal 18 in the digital VCR1.
3, and a copy control signal detector 16 provided in the digital VDR 14. Also, when the former case and the latter case are combined, that is, the copy control signal 18 is used as the copyright information 28 for copy control in the form of a Water Mark, and a single copy attached to the digital content itself. If it exists as the copy control signal 18, Wa
The copy control signal 18 generated from the terMark is preferentially used.

The copy control signal generator 25
Then, the W detected by the Water Mark detector 15
Simply taking out the copy control signal 18 from the after Mark does not remove it. In addition, as described above, the Water Mark includes the copyright holder and other copyright information other than the information described in the copy control signal 18, so that such information can be used separately. It is.

As described above, the home network according to the first embodiment includes a water mark detector, a copy machine, and the like in a device such as a set-top box that receives digital satellite broadcasting and sends out the digital content to a recording device or the like. A control signal generator;
A copy control signal is generated from the copyright information as the er Mark and sent to the recording device together with the digital content including the Water Mark. The recording device is provided with a copy control signal detecting means. Water M consisting of simple circuits
Instead of a recording device having a Water Mark detection mechanism that does not require an ark detection mechanism and is expensive due to such a complicated circuit, a commercially available general-purpose recording device having a copy control signal detector is used. Illegal copying can be prevented. Also, Water Mar
Even if the method of k is changed, it is only necessary to update the Water Mark detection mechanism provided in one set-top box without changing a plurality of recording devices, and the new Water Mark method can be used. It can be easily handled. Similarly, Water Mar
In addition to changing the system of k, when a standard other than Water Mark for embedding copyright protection information in digital content is set and changed to this standard,
Water in one set-top box
It is only necessary to change the Mark detection mechanism to a detection mechanism corresponding to a new standard, and it is possible to relatively easily cope with this.

Embodiment 2 FIG. 3 is a block diagram showing a configuration of a home network according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Reference numeral 31 denotes a set-top box which is a device for receiving digital satellite broadcasts and transmitting the digital contents to a VTR or the like, and 33 denotes a digital VC.
R and 34 are digital VDR, 35 is Water Ma
Water for detecting copyright information 41 as rk
It is a copyright management device provided with a Mark detector.

Next, the operation will be described. A digital satellite broadcast is received by the set-top box 11, and the digital video signal 39 is converted to the digital TV 12, digital VC 12.
R33 and transmitted to the digital VDR. During this transmission, the copyright management device 35 detects the Water Mark embedded in the digital video signal 39, and in accordance with the detected copyright information as the WaterMark, the digital VCR 33 and the digital VD
Control the recording device of R34. For example, if the copyright information is “unlimited copy”, the copyright management device 3
5 is a digital VCR 33 or a digital VDR 3
4, the digital content of the digital video signal 39 is recorded, and if the copyright information is a description "copy not allowed", the copyright management device 35 stops the operation of the recording device and records the digital content. do not do.

Further, referring to FIG.
5 will be described. In the figures, FIG. 2 and FIG.
The same reference numerals indicate the same or corresponding parts. Reference numeral 36 denotes a device operation state monitoring unit that monitors the operation state of the recording device. 3
A control unit 7 determines the control of the recording apparatus based on the copyright information 41 as the Water Mark and information from the device operation state monitoring unit 36. Reference numeral 38 denotes a device control command generation unit which generates a command for controlling the operation of the recording apparatus in response to a determination from the control unit 37. Reference numeral 39 denotes a digital video signal, which indicates digital content.

The operation of FIG. 4 will be described with reference to FIG. First, a digital content as a digital video signal 39 transmitted from the set-top box 31 on the digital bus 40 is monitored from the digital interface 26, and the bit stream of the digital video signal 39 is demultiplexed by the demultiplexer 22, and Separate into audio bitstream. Next, in the video decoder 23 and the audio decoder 24, the video bit stream and the audio bit stream are decompressed into an image signal and an audio signal, respectively, and Wat embedded in the image or the audio signal.
er Mark copyright information 41 as Water
It is detected by the Mark detector 15. On the other hand, the device operation state monitoring unit 36 monitors the operation state of the digital VCR 33 connected to the digital bus 40 via the digital interface 26 and in the home network, and transmits this state to the control unit 37. Then, the control unit 37 detects the Wat detected by the Water Mark detection unit 15.
copyright information 41 as the er Mark and information from the device operation state monitoring unit 36, that is, the digital VCR
A control decision 42 as to whether or not to operate the digital VCR 33 is made according to the information 44 about the operation state of the digital VCR 33, and a command 43 for controlling the digital VCR 33 is generated by the device control command generator 38 according to the control decision 42. . For example, the device operation state monitoring unit 36
Is the Wat detected by the Water Mark detector 15.
When the copyright information 41 as the er Mark indicates that digital recording is not possible and the digital VCR 33 operates and recognizes that the digital content is recorded, the control unit 37 determines the digital content based on these information. In order to prevent the content from being recorded, it is determined that the operation of the digital VCR 33 is controlled to be stopped. In accordance with the control decision 42, a recording stop command 43 is generated by the device control command generator 38, and the recording stop command 4 is output via the digital interface 26.
3 stops the recording of the digital VCR 33. Although the copyright management device 35 is shown as an independent device, it is actually provided in one block in the home network, for example, in the set-top box 31 or in a recording device such as the digital VCR 33. Attached so that the user does not know where it is located,
It is used in the form of a copyright management mechanism instead of a single device. Therefore, the copyright management device 35 is not easily removed and the copyright is protected.

Although only the operation for recording digital contents in the digital VCR 33 has been described above, the flow of signals indicated by arrows in FIG. It is needless to say that the digital VDR 34 is controlled by exactly the same operation to protect the copyright of the digital content.

As described above, in the home network according to the second embodiment of the present invention, the copyright management device for monitoring the transmission of digital contents on the home network is provided in the home network, and the copyright management device includes the water management device. A Mark detector detects copyright information as a Water Mark embedded in the digital content, and a device operation state monitoring unit monitors the operation state of the recording device, and the control unit controls the copyright information and the operation. Receiving the information about the state and controlling the operation of the recording device, and in accordance with the control decision, the device control command generator generates a command and stops the operation of the recording device so that the digital content is not recorded. With such a configuration, the above Water M
This is a case where the copyright information as an ark means that digital recording is not possible, and the Water Mark
When it is detected that the digital content including “.” Is recorded by a recording device such as a digital VTR, illegal copying can be prevented without providing a special mechanism for copyright protection in the recording device. Also, Wa
Even if the ter Mark method is changed, only the copyright management device needs to be updated without changing a plurality of recording devices.
It can easily cope with the method of k. Similarly, W
Water for embedding copyright protection information in digital content as well as changing the format of the after Mark
Even when a standard other than r Mark is set and changed to this standard, it is only necessary to change the copyright management device to one compatible with the new standard, and it is possible to easily cope with it.

Embodiment 3 FIG. FIG. 5 is a block diagram showing a configuration of a home network according to Embodiment 3 of the present invention. In FIG. 3, a copyright management device having a Water Mark detector is replaced with a copyright management device having a copy control signal detector. It is what it was. 5, the same reference numerals as those in FIGS. 1 and 3 denote the same or corresponding parts. Reference numeral 45 denotes a copyright management device, which includes a copy control signal detector 16 for detecting a copy control signal 18 attached to digital content.

FIG. 6 shows the copyright management device 45.
Is composed of the same or corresponding parts with the same reference numerals as those in FIGS. 1, 4, and 5, and the description thereof will be omitted.

Next, the operation of FIGS. 6 and 5 will be described together. First, the digital content as the digital video signal 39 transmitted on the home bus from the set-top box 31 is transmitted to the digital interface 2.
Monitor from 6. The copy control signal is separated by the copy control signal detector 16 from the copy control signal 18 attached to the digital video signal 39, and the copyright information 41 described in the copy control signal 18 is detected. On the other hand, the device operation state monitor 36 monitors the operation state of the digital VCR 33 connected to the digital bus 40 via the digital interface 26 and located in the home network, as in the second embodiment, and controls this state. Tell Then, the control unit 37 controls the copyright information 41 described in the copy control signal 18 detected by the copy control signal detection unit 16 and the information from the device operation state monitoring unit 36, that is, information on the operation state of the digital VCR 33. With 44, a control decision 42 as to whether or not to operate the digital VCR 33 is made, and a command 43 for controlling the digital VCR 33 is generated by the device control command generator 38 according to the control decision 42. For example, the device operating state monitoring unit 36 indicates that the copyright information 41 described in the copy control signal 18 detected by the copy control signal detector 16 indicates that digital recording is not possible,
When it is determined that the digital VCR 33 is operating to record the digital content, the control unit 37
Determines that the operation of the digital VCR 33 is stopped based on the information in order to prevent the digital content from being recorded. In accordance with the control decision 42, a recording stop command 43 is generated by the device control command generator 38, and the recording of the digital VCR 33 is stopped by the recording stop command 43 via the digital interface 26.

As in the case of the second embodiment, only the operation when recording digital contents in the digital VCR 33 will be described above, and the flow of signals indicated by arrows in FIG. However, even when digital contents are recorded in the digital VDR 34, the digital VDR 34 is controlled by exactly the same operation to protect the copyright of the digital contents.

As described above, in the home network according to the third embodiment of the present invention, the copyright management device for monitoring the transmission of digital contents on the home network is provided in the home network, and the copyright management device performs the copy operation. The control signal detector detects the copyright information described in the copy control signal attached to the digital content, and the device operation state monitoring unit monitors the operation state of the recording device. Receiving the information and the information about the operating state,
The operation of the recording device is controlled and determined. In accordance with the control decision, the device control command generation unit generates a command and stops the operation of the recording device so that the digital content is not recorded. When the copyright information described in the control signal indicates that digital recording is not possible, it is detected that the digital content with the copy control signal is recorded by a recording device such as a digital VTR. Then, unauthorized copying can be prevented without providing a special mechanism for copyright protection in the recording device.

[0031]

As described above, according to the home network according to the present invention (claim 1), a device for receiving and recording a digital broadcast program is a home network connected by a digital bus, Copyright information is embedded in the digital content that is the content of the digital broadcast program, and the digital content includes means for creating a copy control signal for copy-controlling the digital content based on the copyright information. A receiver for transmitting the content and the copy control signal; and copy control signal detecting means for extracting the copyright information described in the copy control signal, and records the digital content according to the copyright information. Since it is composed of a recording device, the recording device has a complicated circuit Instead of a recording device equipped with the above detection mechanism, which does not require a detection mechanism for detecting copyrighted information embedded in the contents and becomes expensive due to such a complicated circuit, a copy control is used. There is an effect that illegal copying can be prevented by using a commercially available general-purpose recording device equipped with a signal detector. Also, when the standard for embedding copyright information in digital content is changed, it is only necessary to change the detection mechanism provided in one set-top box to a detection mechanism corresponding to the new standard, There is an effect that it can be handled relatively easily.

Further, according to the home network of the present invention (claim 2), a device for receiving and recording a digital broadcast program is a home network connected by a digital bus. Copyright information is embedded in the digital content, and the device for transmitting the digital content, the means for detecting the copyright information in the digital content, and the operation of the recording device for recording the digital content Device operation state monitoring means for monitoring a state; control means for determining operation control of the recording apparatus based on the copyright information and the operation state; and device control command generation means for generating a control command according to the determination Which controls the operation of the recording apparatus in accordance with the control command. Since it is composed of a management device and a recording device for recording the digital content in accordance with the control command, the copyright information embedded in the digital content indicates that digital recording is not possible, and Is digital VT
When it is detected that the data is recorded by a recording device such as R, there is an effect that unauthorized copying can be prevented without providing a special mechanism for copyright protection in the recording device. Also, when the standard for embedding copyright protection information in digital content is changed, only the copyright management device needs to be changed to one that supports the new standard. is there.

According to the home network of the present invention (claim 3), a device for receiving and recording a digital broadcast program is a home network connected by a digital bus, and A copy control signal is attached to the digital content, and a device for transmitting the digital content, and copy control signal detecting means for detecting copyrighted information described in the copy control signal attached to the digital content are provided. Apparatus operation state monitoring means for monitoring an operation state of a recording apparatus for recording the digital content; control means for deciding operation control of the recording apparatus based on the copyright information and the operation state; Device control command generating means for generating a control command according to Since it is composed of a copyright management device that controls the operation of the recording device according to the control command and a recording device that records the digital content according to the control command, the recording device does not need to be provided with a special mechanism for copyright protection. This has the effect of preventing unauthorized copying.

According to the home network according to the present invention (claim 4), in the home network according to claim 1 or 2, the copyright information is such that the digital content includes
Since it is assumed that ter Mark (digital watermark) is embedded in the recording device, the recording device does not need a Water Mark detection mechanism composed of a complicated circuit. There is an effect that illegal copying can be prevented by using a commercially available general-purpose recording apparatus having a copy control signal detector instead of the expensive recording apparatus having a water mark detection mechanism. Further, even when the method of WaterMark is changed, the Water provided in one set-top box without changing a plurality of recording devices.
Only the mark detection mechanism or the copyright management device needs to be updated, and a new Water Ma
There is an effect that it can easily cope with the rk method.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a home network according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of the set-top box of FIG.

FIG. 3 is a block diagram showing a configuration of a home network according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a copyright management device of FIG. 3;

FIG. 5 is a block diagram showing a configuration of a home network according to a third embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of the copyright management device of FIG. 5;

FIG. 7 is a block diagram illustrating an example of a configuration of a conventional home network.

[Explanation of symbols]

11 Set Top Box (Built-in Water Mark Detector) 12 Digital TV 13 Digital VCR (Built-in Copy Control Signal Detector) 14 Digital VDR (Built-in Copy Control Signal Detector) 15 Water Mark Detector 16 Copy Control Signal Detector 17 Water Mark 20 Digital reception including 21 Demodulation unit 21 Conditional reception control unit 22 Demultiplexer 23 Video decoder 24 Audio decoder 25 Copy control signal generator 26 Digital interface 27 D / A converter 31 Set-top box 33 Digital VCR 34 Digital VDR 35 Right management device (Built-in Water Mark detector) 36 Device operation status monitoring unit 37 Control unit 38 Device control command generation unit 39 DE Digital video signal 40 Digital bus 45 Copyright management device (built-in copy control signal detector) 51 Bit stream 101 Set-top box 102 Digital TV 103 Digital VCR 104 Digital VDR 105 Water Mark detector

Claims (4)

[Claims] An apparatus for receiving and recording a digital broadcast program is a home network connected by a digital bus, wherein copyright information is embedded in digital contents as contents of the digital broadcast program, Means for generating a copy control signal for copy-controlling the digital content based on the copyright information, the digital content, and a receiving device for transmitting the copy control signal; A home network comprising: a copy control signal detecting means for extracting the described copyright information; and a recording device for recording the digital content in accordance with the copyright information. 2. A home network in which a device for receiving and recording a digital broadcast program is connected by a digital bus, wherein copyright information is embedded in digital content, which is the content of the digital broadcast program, An apparatus for transmitting the digital content; a unit for detecting the copyright information in the digital content; a device operation state monitoring unit for monitoring an operation state of a recording apparatus for recording the digital content; Control means for determining operation control of the printing apparatus based on the information and the operation state; and equipment control command generating means for generating a control command in accordance with the determination, and controlling the operation of the printing apparatus according to the control command. A copyright management device and the digital controller according to the control command. Home network, characterized in that comprising a recording apparatus for recording Ntsu. 3. A home network in which a device for receiving and recording a digital broadcast program is a home network connected by a digital bus, wherein the digital content as the content of the digital broadcast program is provided with a copy control signal, A device for transmitting digital content; a copy control signal detecting means for detecting copyrighted information described in the copy control signal attached to the digital content; and an operation state of a recording device for recording the digital content. Device operation state monitoring means, control means for determining operation control of the recording apparatus based on the copyright information and the operation state, and device control command generation means for generating a control command according to the determination; Copyright management device for controlling the operation of the recording device according to the control command And a recording device for recording the digital content in accordance with the control command. 4. The home network according to claim 1, wherein the copyright information is that the digital content is in a state where a Water Mark (digital watermark) is embedded in the digital content. A home network, characterized in that: