JP2000285027A - Cache device, transmitting device and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect and use the copyright as desired by a writer by transmitting selectively the data which are reproduced by a cache device connected to plural devices of opposite parties to one of these opposite parties in accordance with the contents of the copyright. SOLUTION: The data with which the copyright is claimed are reproduced only once by a cache device 52 and then sent to a digital bus 54. At the same time, the device 52 or a transmitting device 49 selects its device to be used in accordance with the contents of the copyright. In this selection step, if the cache devices other than the device 52 are connected to the bus 54, only a cache device 53 can use the data in accordance with the contents of the copyright and other cache devices and the non-cache devices 50 and 51, etc., cannot use the data. Otherwise, the devices 50, 51, etc., can all use the data in accordance with the contents of the copyright and the device 53, etc., cannot use the data respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cache device, a transmission device, and a program recording medium for handling copyrighted data when a plurality of devices are connected.

[0002]

2. Description of the Related Art There is an increasing need for digitalization and multimedia in home systems, offices and business systems. In such a situation, IEEE 1394-1995 has attracted attention in recent years (hereinafter, referred to as IEEE 1394 bus). This was I in 1995
It is a high-speed serial bus standard standardized by EEE.
The IEEE 1394 bus has characteristic functions for plug-and-play and multimedia data transfer.
That is, it has an isochronous data transfer (Isochronous) that secures a band for transferring data such as video and audio and enables real-time transfer.
Further, control of video data of a digital camera or the like (switching of video data, control of camera) can be simultaneously performed by an IEEE 1394 control command (asynchronous (asynchronous) data) from a control program of a PC connected via the IEEE 1394 bus.

When exchanging data such as video and audio data based on such a standard IEEE 1394 bus, the data may have a copyright. The content of the copyright of the data is CGMS (Copygenera)
Tion management system) and C
EMI (EncryptionM) generated from GMS
mode Indicator).

[0004] The CGMS exists inside a transport stream transmitted from a broadcasting station. CGMS is 2-bit data. The possible values of CGMS and their meanings are as follows.

That is, when CGMS = 11, copy
Never means copy when CGMS = 10
means one generation, CGMS = 0
When it is 0, it means copy free. Where cop
y never indicates that copying is prohibited, and permits the data to be viewed only once. copy
One generation allows only one generation to be copied, and the copied data can be viewed repeatedly as many times as necessary. copyfree
Indicates that it may be freely copied.

[0006] When CGMS is 11, ie, copy
In the case of never, the data can be viewed only once. That is, the data can be viewed only during the time zone in which the data is being broadcast.

[0007] Also, EMI uses STB (Set) from CGMS.
Top Box: satellite broadcast receiver). That is, the CGMS is added to the data at the broadcasting station, and the STB that receives the broadcast wave transmitted from the broadcasting station is an IEEE 139.
Broadcast the received program to 4 buses. At this time, the CGMS is embedded in the service information portion of the MPEG2 transport stream of the isochronous packet data. One isochronous packet data contains multiple MPEGs.
Data is stored, and for each MPEG data,
There is a corresponding CGMS for each.

[0008] EMI is generated by the STB from such CGMS. The STB checks the CGMS of each data transmitted in one isochronous packet data, and assigns one EMI to one isochronous packet data as a representative value. The EMI is held in the header portion of the isochronous packet data.

The value of EMI is the value of CGMS with the strictest copyright restriction among the CGMS of data existing in one isochronous packet data. For example, if the CGMS of data in one isochronous packet data is 11, 10, and 10,
The value of EMI is 11, which is the most restrictive. Also CGM
When S is 10, 10, 00, and 00, the value of EMI is 10, which is the strictest among them. Thus, the value of EMI is determined.

[0010] With regard to possible values of EMI, EMI = 11 indicates copy never, and EMI = 10
Allows copy for only one generation (copy one gene)
EMI = 00 indicates that the copy is free (co
py free). Up to this point, it is the same as CGMS. The only EMI is EMI = 01, which is a change of the EMI after recording the copy one generation data, and a further copy indicates no more copy.

Conventionally, the content of copyright by CGMS is co
In the case of the py never, the corresponding data can be viewed only once, but the viewing time is limited to the time when the program is being broadcast. In this way, if it is the intention of the author to permit viewing only once, the time period during which viewing is permitted is limited. That is, even when the viewer wants to view the program during his or her convenient time, he or she can only watch the program during the time when the program is broadcast. The content of the copyright by CGMS is c
In the case of the one-one generation, once data is recorded on one recording medium, data cannot be moved to another recording medium.

Further, in the case of an apparatus configuration having no transport decoder, the content of the copyright is determined using EMI. The same can be said for CGMS when using EMI.

[0013] Therefore, information indicating the copyright of the program is copy.
In the case of never, the viewer can view the data as intended by the author to permit viewing only once, and the viewer can view the data without limiting the time zone after the data is broadcast. A recording / reproducing apparatus capable of transferring data from a recording medium once recorded to another recording medium when the content of the copyright of the program is copy one generation is disclosed in Japanese Patent Application No.
No. 312596.

An ordinary recording / reproducing apparatus such as a VCR cannot record data when the content of the copyright is copy never. However, Japanese Patent Application No. 10-31259
The recording / reproducing apparatus disclosed in No. 6 has a copyright c
It is possible to record data which is an "opy never". However, there are restrictions when playing recorded data. That is, the data can be reproduced only once.

In order to realize the function of reproducing only once, this recording / reproducing apparatus performs the following processing. That is, reproduction information, which is information indicating whether or not the data has been reproduced, is recorded in pairs with the data, and after the data is reproduced, the reproduction information of the reproduced data is set from unreproduced to reproduced. . Alternatively, during the reproduction of data, the reproduction information is set to “reproduced” in block units from the data that has been reproduced. Then, processing is performed such that only the part where the reproduction information is not reproduced is reproduced, and if the reproduction information is set to the reproduction completed, the data of that part is not reproduced.

Alternatively, as another method for realizing the function of performing one-time reproduction, the recording / reproducing apparatus performs the following processing. That is, after the data is reproduced, the reproduced data is erased from the recording medium. Alternatively, a process of erasing, from a recording medium, a portion of data that has been reproduced during data reproduction is performed.

Alternatively, as still another method, encryption is performed when data is recorded on a recording medium separately from the encryption performed when transmitting data, and the encryption is decrypted when reproducing the data. The decryption key for the recording encryption changes randomly with time, and this key is recorded on a recording medium in pairs with data. Then, when the reproduction of the data is completed, this key is erased from the recording medium so that the data can be reproduced only once. Alternatively, processing is performed such that data is reproduced only once by sequentially erasing the keys of the data portion that has been reproduced during data reproduction.

Further, this recording / reproducing apparatus can be used even when the content of the copyright is copy one generation.
A function of reproducing the data only once by the same processing as the copy never is provided. However, copy
In the case of one generation, a normal recording / reproducing apparatus outputs EMI in place of no more copy when the content of the copyright is EMI, and outputs CGMS in place of copy never when the copyright is CGMS. On the other hand, this recording / reproducing apparatus uses copy one generation without changing the contents of copyright.
Play it only once. By doing so, it is possible to move the copy one generation data from one recording medium to another recording medium.

[0019]

SUMMARY OF THE INVENTION However, the IEEE
A plurality of various devices are connected to the E1394 bus and exchange data with each other. When such a recording / reproducing device exchanges copyrighted data with another device,
There is a problem that copyright cannot be protected as intended by the author.

For example, if the content of the copyright is copy nev
After the recording / reproducing apparatus records the data of er, a plurality of devices having the same function as the recording / reproducing apparatus may simultaneously acquire the data from the recording / reproducing apparatus and record the data. In this case, the copy never data is recorded in a plurality of devices, and the data can be viewed a plurality of times, and the copyright is protected as the author intends to permit viewing only once. I can't do that. Also, if the content of the copyright is copy ne
After the recording / reproducing device records the data of the ver., the monitor and the device having the same function as the recording / reproducing device may acquire the data. Then, after viewing the data once on the monitor, the recording / reproducing device can reproduce the data only once and watch the data again, so that the user is permitted to view the data only once. The copyright cannot be protected as intended by the author. When a plurality of the recording / reproducing devices are connected to a transmitting device having a function of receiving a broadcast wave such as an STB and transmitting the received data to another device,
When the data of the copyright is "copy never" is transmitted from the transmitting device, the plurality of recording / reproducing devices record the data, and this data can be viewed a plurality of times. Copyright cannot be protected as the author intends to allow.

Some of the transmitting devices are provided with an analog terminal, and an analog monitor is connected to the analog terminal so that the user can view video / audio data transmitted from a broadcasting station. When such a device outputs data, if the recording / reproducing device is present, there is a problem that the copyright cannot be protected as intended by the author.

For example, such a device can copy copyrighted data to an IEEE 13 connected to the recording / reproducing device.
When the data is output to the 94 bus, the data is once viewed on the analog monitor and then recorded on the recording / reproducing device connected to the IEEE 1394 bus, so that the user can view the content twice. Therefore, the author's intention to permit viewing once is not maintained.

As described above, the conventional apparatus that reproduces the copyrighted data only once without changing the content of the copyright has the above-described various problems. In the present application, a device that solves these problems will be referred to as a cache device.

The present invention includes an apparatus for reproducing copyrighted data only once without changing the content of the copyright,
When multiple devices are connected, the copyright cannot be protected as intended by the author, and when the monitor is connected to the monitor terminal, the copyrighted data cannot be protected. In consideration of the problem that copyright cannot be protected as intended by the author when this device outputs, it is possible to protect the copyright of data claimed to be copyright as intended by the author. In addition, data can be viewed in any time zone different from the time zone in which the data was broadcast, and even when a monitor terminal is provided and the monitor is connected, the data is claimed for copyright. It is an object of the present invention to provide a cache device, a transmission device, and a program recording medium which can sometimes protect the copyright as intended by the author.

[0025]

In order to solve the above-mentioned problems, a first aspect of the present invention (corresponding to claim 1) is a recording means for recording data, and a method in which the data is copyrighted. Reproducing means for reproducing the data only once without changing the content of the copyright claim of the data recorded by the recording means, wherein the cache device is connected to a plurality of destination devices. And transmission selection means for selecting which of the destination apparatuses, the data reproduced by the reproducing means can be used in accordance with the contents of the copyright. A cache device characterized by the following.

According to a second aspect of the present invention (corresponding to claim 2),
The transmission selecting means, when sending the copyrighted data, when there is at least one device having the function of the cache device among the devices of the other party, the device having the function of the cache device Only one device or the device having the function of the cache device, except for the device having the function of the cache device, can use the data in accordance with the content of the copyright to all the devices that do not have the function of the cache device. If there is no device that has
The cache device according to the first invention, wherein the data is made available to all of the destination devices in accordance with the contents of the copyright.

A third aspect of the present invention (corresponding to claim 3) is:
The transmission selecting means selects the destination device by passing a key for decrypting the encrypted copyrighted data to the destination device. A cache device according to a second aspect of the present invention.

The fourth invention (corresponding to claim 4) provides:
The transmission selecting means distributes a key for decrypting data to the connected device of the other party in advance, and determines which key encrypts the copyrighted data with the other device. The cache device according to the first or second invention, wherein the preceding device is selected.

The fifth invention (corresponding to claim 5) provides:
A third or fourth invention according to the third or fourth invention, wherein the transmission selecting means performs authentication with the destination device before passing the key to the destination device, and passes the key only when the authentication is successful. 2. The cache device according to item 1.

The sixth invention (corresponding to claim 6) provides:
The transmission selection unit, when the destination device does not have the function of the cache device has not received any,
The cache device according to the fifth invention, wherein the cache device is searched for, and the cache device is instructed to issue an authentication request for receiving the key.

A seventh aspect of the present invention (corresponding to claim 7) is:
The transmission selecting unit encrypts the key with a temporary key used for authentication with the partner device and transfers the key to the partner device when transferring the key to the partner device. A cache device according to a fifth aspect of the present invention.

An eighth aspect of the present invention (corresponding to claim 8) is:
The cache device according to any one of the first to seventh inventions, wherein the transmission selection means does not encrypt the data when the data is not copyright-free (copy free).

A ninth aspect of the present invention (corresponding to claim 9) is:
The content of the copyright is defined as copy never permitting viewing only once, or permitting copying only once (copy one gene).
The cache device according to any one of the first to eighth aspects of the present invention is characterized in that no duplication or further duplication is permitted (no more copy).

The tenth invention (corresponding to claim 10)
Is a cache device according to any one of the first to ninth inventions, wherein one of the connected destination devices is a monitor directly connected to the cache device.

The eleventh invention (corresponding to claim 11)
Is an output device that outputs data, and is a transmission device connected to a plurality of destination devices, wherein, among the connected destination devices, data output by the output unit is output to any destination device. And a transmission selecting means for selecting whether to use the cache device according to the content of the copyright. The cache device according to any one of the first to tenth aspects of the present invention is included in the destination device. The transmitting device is characterized by including at least one device or not including at least one device.

The twelfth invention (corresponding to claim 12)
The transmission selecting means has the function of the cache device when transmitting copyrighted data, and when there is at least one device having the function of the cache device among the devices of the other party, Only one device or, except for the device having the function of the cache device, can use the data according to the content of the copyright to all devices that do not have the function of the cache device. In the case where there is no device having a function, the data is made available to all of the destination devices in accordance with the contents of the copyright.
A transmission device according to the invention.

The thirteenth invention (corresponding to claim 13)
Comprises analog output means for outputting data in analog form, and digital output means for digitally outputting the data.When the digital output means digitally outputs copyrighted data, the analog output of the analog output means is output. A transmission device that is invalidated.

The fourteenth invention (corresponding to claim 14)
Is a recording / reproducing apparatus comprising: recording means for recording data; and reproducing means for reproducing the data only once without changing the contents of the copyright when the data is copyrighted. 14. The apparatus according to claim 14, wherein when the digital output means digitally outputs the copyrighted data, the analog output of the analog output means is invalidated.
A transmission device according to the invention.

The fifteenth aspect of the present invention (corresponding to claim 15)
The transmission device according to the eleventh or twelfth aspect, wherein one of the connected destination devices is a monitor directly connected to the transmission device.

The sixteenth invention (corresponding to claim 16)
Means that the content of the copyright is "copy never" that permits viewing only once (copy never) and that "copy once" is permitted (copy one generator)
No further duplication is permitted (no m
(11) The transmission device according to any one of the eleventh to fifteenth aspects, wherein the transmission device is any one of (e.

The seventeenth invention (corresponding to claim 17)
According to another aspect of the present invention, there is provided a program recording program for causing a computer to execute a part or all of the functions of each component of the cache device or the transmission device according to any one of the first to sixteenth aspects. Medium.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the concept of a cache device, a non-cache device, and a transmission device will be described with reference to FIG.
This will be described with reference to FIG. These concepts are commonly used in the second to seventh embodiments described later.

In FIG. 8, the digital bus 54 is, for example, an IEEE 1394-1995-described IEEE
standard for High performer
manse Serial Bus (hereinafter IEEE)
A bus that can exchange commands and data between devices such as an E1394 bus) and an IEEE 1394 bus. The digital bus 54 has an STB 55 and a TV monitor 5
6, a hard disk device 57 and the like are connected. The STB 55 receives the data transmitted from the broadcasting station, transmits the data to the digital bus 54, and transmits the data to the TV monitor 56.
Monitors the data sent to the digital bus 54, and the hard disk device 57 records the data sent to the digital bus 54, reproduces the recorded data, and transmits the data to the digital bus 54. In the present embodiment, such various devices are first classified as a cache device, a non-cache device, and a transmission device.

In FIG. 7, the digital bus 54 is connected to the IE
An EE1394 bus, which can exchange commands and data, and is connected to each device. The non-cache devices 50 and 51, the cache devices 52 and 53, and the transmission device 49 are connected to the digital bus 54.

First, the non-cache device 50 or 51
For example, as in a television monitor 56, normal processing is performed according to the content of the copyright of the data. That is,
The data is processed according to the value of EMI, which is the content of the copyright of the data. In the case of the TV monitor 56,
EMI is copy never, copy one
The data is monitored in any of the cases of “near- nation” and “no more copy”. When the non-cache device 50 or 51 is a device that performs recording and reproduction such as a hard disk device or a VCR, EMI is
In the case of y never and no more copy, no data is recorded. Also, EMI is copy one geo
At the time of the negotiation, the data is recorded, and at the time of the reproduction, the EMI is copied by the copy one generation.
To no more copy and output. Also, the data sent from the broadcasting station is copy never
In the case of r, the non-cache device 52 or 53 does not record the data even if it is a device that performs recording and reproduction, so that the program can be viewed only during the broadcasting time zone. As described above, the non-cache device 50 or 51 is a device that processes data in accordance with the content of the copyright of the data, and is generally divided into a device that monitors data and a device that performs recording and reproduction depending on the content of the copyright. Can be separated.

Next, the cache device 52 or 53
MI is copy never or no more c
This device can record optic data, reproduces the data only once, and does not reproduce the data more than once. By doing so, the viewer can view the data at any time when he wants to view the data while keeping the intention of the author. Also, EMI is copy one gen
data can be recorded and can be reproduced only once.
Output as py one generation. By doing so, the viewer can store the data in the non-cache device 50 or 5 while maintaining the intention of the author.
Since the data can be temporarily stored until the data is recorded in No. 1, the viewer should carefully consider a device for recording the data and then record the data in the non-cache device 52 or 53 at a time desired by the viewer. Can be done.

The transmitting device 49 does not receive data from the digital bus 54 like the STB 55 shown in FIG. 8, but obtains data from another place such as a broadcasting station and transmits the data to the digital bus 54. It is.

In the above description, the copyright is described based on EMI. However, when the cache device or the non-cache device has a transport stream decoder, the data is processed by the CGMS according to the content of the copyright. . Copy f in EMI and CGMS
In the case of ree, it is not data for which copyright is claimed,
There are no restrictions on processing that data.

The concepts of the cache device, the non-cache device, and the transmission device are as follows.

As is apparent from the description of the problem to be solved by the invention, the cache device 50 or 51
Is connected to the digital bus 54, it is not possible to protect the content of the copyright of the claimed data. Therefore, in the present embodiment, a description will be given below of the fact that the contents of the copyright of data can be protected even when the cache device 50 or 51 is connected.

First, (1) the case where the cache device 52 transmits the copyrighted data to the digital bus 54 will be described, and then (2) the transmitting device 49 transmits the copyrighted data to the digital bus 54. The case of transmission will be described, and finally (3) the case of the non-cache device 50 transmitting the copyrighted data to the digital bus 54 will be described.

(1) Description of the case where the cache device 52 transmits the copyrighted data to the digital bus 54 When the cache device 52 reproduces the copyrighted data only once, the data is transferred to the digital bus. It is transmitted to the bus 54. If the non-cache device 50 or 51 uses this data simultaneously with the other cache device 53, the contents of the copyright cannot be protected. Therefore, the following rules are set so that the contents of copyright can be protected.

That is, the cache device 52 receives the data for which the copyright is claimed from the digital bus 54, and selects a device to be used in accordance with the content of the copyright.

When a cache device other than the cache device 52 is connected to the digital bus 54, only one of the cache devices can use the data according to the content of the copyright. Other cache devices and non-cache devices make data unavailable. Alternatively, data is made available to all non-cache devices according to the contents of the copyright, and data is made unavailable to the cache device.

When no cache device other than the cache device 52 is connected to the digital bus 54,
The data is made available to all devices connected to the digital bus 54 in accordance with the contents of the copyright.

When the cache device 52 is a device capable of simultaneously recording while reproducing, the cache device 5
(2) When one cache device other than the cache device 52 uses and records the copyrighted data output by itself, the cache device 52 disables recording of the data output by itself. That is, the cache device that permits recording is the cache device 52 that is sending data.
Only one unit, including yourself.

The cache device that can use the data records the data and reproduces it only once. If this cache device is the cache device 53, the operation when the cache device 53 reproduces data only once is the same as the operation when the cache device 52 reproduces data. (2) Description of case where transmitting device 49 transmits copyrighted data to digital bus 54 The transmitting device 49 transmits the copyrighted data to the digital bus 54. This data is stored in the cache device 52,
If the 53 and the non-cache devices 50 and 51 are used at the same time, the contents of the copyright cannot be protected. Therefore, the following rules are set so that the contents of copyright can be protected.

That is, the transmission device 52 receives the copyrighted data from the digital bus 54 and selects a device to be used according to the content of the copyright.

When one or more cache devices such as the cache devices 52 or 53 are connected to the digital bus 54, only one of the cache devices can transfer data in accordance with the contents of the copyright. Make the data available to other cache devices and non-cache devices. Alternatively, the data is made available to all non-cache devices according to the contents of the copyright, and the cache device is made unable to use the data.

When no cache devices such as the cache devices 52 and 53 are connected to the digital bus 54, the data can be used for all devices connected to the digital bus 54 in accordance with the contents of the copyright. I do.

The transmitting device 49 transmits the IEEE13
If the device is capable of simultaneously receiving streams from the H.94 bus and also capable of monitoring and outputting the received streams, the transmission device 49 itself outputs the copyrighted data to a cache device other than the transmission device 49. At the time of using and recording, the transmitting device 49 makes it impossible to receive the data output by itself. That is, when the transmitting device has a function of a non-cache device, the function portion is processed assuming one cache device.

When the transmitting device 49 has a function of simultaneously monitoring and outputting the data while transmitting it to the digital bus 54, the copyrighted data output from the transmitting device 49 is recorded using one cache device. At this time, the monitor output is invalidated.

The cache device which can use the data records the data and reproduces it only once. Assuming that the cache device is the cache device 52, the operation when the cache device 52 reproduces the data only once is described in "(1) When the cache device 52 transmits the copyrighted data to the digital bus 54". Description "
Performs the same operation as.

(3) Description of a case where the non-cache device 50 transmits the copyrighted data to the digital bus 54 The non-cache device 50 transmits the copyrighted data to the digital bus 54. If this data is used simultaneously by the cache devices 52 and 53 and the non-cache devices 50 and 51, the contents of the copyright cannot be protected. Therefore, the following rules are set so that the contents of copyright can be protected.

That is, a mechanism is created in advance that receives the data for which copyright has been claimed from the digital bus 54 and can select a device that can be used in accordance with the content of the copyright. There are two ways to do this.

First, the first method is as follows.
53 and the non-cache devices 50, 51 may support different authentications or different types of keys. That is, when the device that issues an authentication request to receive data from the non-cache device 50 and performs authentication is the non-cache device 51, the authentication method is determined in advance so that the authentication is successful.
Also, a device that issues an authentication request and performs authentication to receive data from the non-cache device 50 is a cache device 52.
In the case of 53, the authentication method is determined in advance so that the authentication fails. However, authentication in transmission from the cache device to the non-cache device needs to be performed as described in “(1) When the cache device outputs data for which copyright is claimed to the digital bus 54”.
In this case, the authentication method is determined so that the authentication is successful. When the authentication method is determined in this manner, the copyrighted data from the non-cache device 50 is transferred to the digital bus 54.
When the data is transmitted to the non-cache device 50 or 51, the data can be used according to the content of the copyright, so that the content of the copyright can be protected. If the non-cache device that has received the data is a device capable of recording and reproducing, the description from the beginning of “(3) When the non-cache device 50 transmits the copyrighted data to the digital bus 54” in this description. The same operation as the non-cache device 50 is performed.

In the second method, when data whose copyright is claimed is transmitted from the non-cache device 50, the cache device 52 or 53 switches the mode so as to perform the same operation as the non-cache device. . As a mode switching method, the cache device is set so as not to be in the mode of operating as a cache device unless the cache device is authenticated as the cache device. For example, E
When the data of MI is copy never is sent from the non-cache device 50, the non-cache device 50
Does not support the function of authenticating the cache device 52 or 53 as a cache device, and thus is identified as a non-cache device. Therefore, the cache device 52
Or 53 will operate in non-cache mode. Therefore, the cache device 52 or 5
No. 3 does not record the data. In this way, even when data is sent from the non-cache device 50, the copyright can be protected. However, in the case of such a cache device, copy on recorded in the non-cache mode is performed.
When the data of the e-generation is transmitted in the cache mode, no more copy is set. Because copy recorded in non-cache mode
Copy one generation data in cache mode in copy one generation
In the case of transmission as it is, for example, when there are n cache devices ahead of one non-cache device and m cache devices are connected to the respective cache devices, n
N cache devices operated in non-cache mode
After recording the data of the copy one generation, copy one generation is performed in the cache mode.
If the n × m cache devices are in the cache mode while maintaining the generation, n × m copy o
This is because ne generation data exists, and the number of copies can be increased one after another. Since the cache device that has received the data operates as a non-cache device, “(3) Non-cache device 5
0 transmits the copyrighted data to the digital bus 54 ".

In this embodiment, the concepts of the cache device, the non-cache device, and the transmission device have been described. It also shows that the copyright of the claimed data can be protected even when the cache device is connected to a digital bus.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG.

As described in the first embodiment, the cache device selects which of the devices that receive data to use the data according to the contents of the copyright. In this embodiment, a specific example will be described in which a device that outputs data selects a device that uses data.

FIG. 1 is a block diagram of the transmission selecting means 1 which is incorporated in the cache device and the transmitting device and selects a device using data. The transmission selecting means 1 is configured as follows.

That is, the mode storage means 2 makes the data available to the cache device according to the contents of the copyright (hereinafter referred to as a cache mode) or makes it available to the non-cache device (hereinafter the non-cache device). (Referred to as a mode). The receiving device candidate determination means 3 searches for an appropriate cache device when a transmission request or an authentication request has been made to use data, or when a non-cache device is not in a receiving state, and selects a candidate device to use data. It is a means to determine. The receiving device discriminating means 4 is a means for discriminating whether or not a device which is going to use data is a cache device or a non-cache device by performing authentication. The mode determining means 5 is a means for determining the mode of the cache mode or the non-cache mode depending on the type of the device using the data. The notifying unit is a unit that notifies the non-cache device 11 and the cache device 12 of the mode of the current cache mode or the non-cache mode. The key generation and output unit 7 is configured such that in the case of the cache mode, one of the cache devices generates a key for decrypting the data encrypted for transmission,
In the non-cache mode, a key is passed to the specific one, and in the non-cache mode, a key is generated for decrypting data encrypted for transmission to all the non-cache devices, and the key is passed. The encryption means 8 is means for encrypting the copyrighted data with the key generated by the key generation and output means 7 and outputting the data to the digital bus 54. The authentication unit 9 is a unit that performs authentication when a key for decrypting the data encrypted by the encryption unit 8 is passed to the cache device or the non-cache device. The changeover switch 10 is a switch that switches between a non-cache device and a cache device to perform authentication.

As devices using data from the transmission selecting means 1, a non-cache device 11 and a cache device 12 are connected to the digital bus 54.

Next, the operation of this embodiment will be described.

First, before the transmission selecting means 1 transmits the copyrighted data to the digital bus 54, the receiving device candidate determining means 3 determines a candidate for a receiving apparatus. When there is a transmission request or an authentication request from the non-cache device 11, the cache device 12, or the like, the device that has issued the transmission request or the authentication request is set as a candidate for the receiving device. If at least one of the non-cache devices has not issued a transmission request or an authentication request, the receiving device candidate determination means 3 sets the digital bus 54
And sends a command instructing the cache device to issue an authentication request. When no cache device is connected, any one of the non-cache devices may be selected and a command instructing the non-cache device to issue an authentication request may be sent. Thus, the receiving device candidate determining means 3 determines receiving device candidates. In order to search for a cache device, for example, a command for inquiring whether the device is a cache device may be issued.

Next, the receiving device determining means 4 determines the type of the receiving device from the candidates determined by the receiving device candidate determining means 3. The determination is made by authenticating whether or not the candidate for the receiving device is a cache device. If the candidate receiving device succeeds in authentication with the receiving device determining means 4, it is determined that the receiving device is a cache device. If the authentication fails, it is determined that the receiving device is a non-cache device.

Next, the mode determining means 5 determines whether the mode is the cache mode or the non-cache mode based on the type of the receiver candidate determined by the receiving device determining means 4. When the mode is further determined, the determined mode is stored in the mode storage means 2. For example, when the mode determination unit 5 determines the cache mode, the mode storage unit 2 stores the cache mode as the current mode. Further, the notifying unit 6 notifies the receiving device candidate determined by the receiving device candidate determining unit 3 of the mode determined by the mode determining unit 5 to the current mode. For example, when the cache mode has been determined, all the candidates for the receiving device are notified that the mode is the cache mode. The copyrighted data is encrypted by the encryption means 8 and output to the digital bus 54. Further, the mode determining means 5 determines to which receiving device candidate the key for decrypting the encrypted data is to be sent.

The criterion for determining which receiving device candidate the mode receiving means 5 determines as an actual receiving device may be determined according to any of the following criterion.

That is, the first judgment criterion is to judge the receiving device which first issued the data transmission request to the transmission selecting means 1 as the actual receiving device. The second determination criterion is that the viewer prioritizes the receiving devices, and determines that the receiving device is an actual receiving device from the one with the highest priority. A third criterion is to judge the receiving device that last sent the data transmission request to the transmission selecting means 1 as an actual receiving device. The fourth criterion is that, among the candidates for the receiving device, the cache device is prioritized over the non-cache device and is determined as the actual receiving device. The fifth criterion is to determine the actual receiving device by giving priority to the non-cache device over the cache device among the receiving device candidates. A sixth criterion is to determine the actual receiving device based on the capability of the device such as the recording time and the number of simultaneous recording channels. For example, a device having a long recording time and a large number of channels that can be simultaneously recorded is determined as an actual receiving device. A seventh criterion is to determine the actual receiving device based on the frequency of use of the device. For example, determining the most frequently used receiving device as an actual receiving device. Alternatively, the least used receiving device is determined as an actual receiving device. The criterion for determining which receiving apparatus candidate the actual receiving apparatus has by the mode determining means 5 has been described above.

Next, the authentication means 9 authenticates the candidate of the receiving device to which the key is to be passed in order to pass the key. For example, if it is determined that the key is to be passed to the non-cache device 11, the key is authenticated with the non-cache device 11, and if the authentication is successful, the key generation and output unit 7 uses the key for decrypting the encrypted data. Is generated and sent to all non-cache devices such as the non-cache device 11. If the candidate for transferring the key is a cache device, the key is sent to only one of the cache device candidates. However, this key is previously encrypted with a temporary key used when the authentication unit 9 performs authentication with the receiving device, and the cache device 1
The temporary key is passed to one cache device such as 2 and the cache device 12 uses the temporary key to decrypt the key for data decryption.

When the cache device obtains the key for decrypting the data, the data and the key sent from the digital bus 54 are recorded.

In the present embodiment, a device that can use copyrighted data is determined by passing a key for decrypting the encrypted data to the device selected by the transmission selecting means 1. Which device is selected is the same as that described in the first embodiment.

(Third Embodiment) Next, a third embodiment will be described with reference to FIG.

As described in the first embodiment, the cache device selects which of the devices that receive data to use the data according to the contents of the copyright. Also in the present embodiment, a specific example in which a device that outputs data selects a device that uses data will be described.

FIG. 2 is a block diagram of the transmission selecting means 1 which is incorporated in the cache device and the transmission device and selects a device using data. The transmission selecting means 1 is configured as follows.

That is, the receiving device candidate determining means 3
Is a means for searching for an appropriate cache device when a transmission request or an authentication request for using data or a non-cache device is not in a reception state, and determining a candidate for a device using data. In order to search for a cache device, for example, a command for inquiring whether the device is a cache device may be issued. The receiving device grouping unit 13 is a unit that performs grouping by performing authentication with each candidate of the receiving device. Key generation means 14
Is a means for generating a key for decrypting the data encrypted for each group of the receiving devices grouped by the receiving device grouping means 13. Different keys are generated for different groups. The transmission request detecting means 18 is a means for detecting from which group a transmission request is issued. The transmission group determining means 17 is a means for determining which group key encrypts the key whose copyright is claimed from the group having the transmission request detected by the transmission request detecting means 18 and the current transmission group. The current transmission group storage means 16 is a means for storing the determined group. The key distribution unit 15 is a unit that distributes the key generated by the key generation unit 14 to devices in each group. The authentication unit 9 authenticates the device that has issued a request to receive the key when distributing the key generated by the key generation unit 14, and determines a key for decrypting data with the temporary key generated at that time. It is a means of encrypting and distributing. The changeover switch 10 switches which device is to be authenticated.

Next, the operation of the present embodiment will be described.

First, before the transmission selecting means 1 transmits the data for which the copyright is claimed to the digital bus 54, the receiving device candidate determining means 3 determines receiving apparatus candidates. When there is a transmission request or an authentication request from a non-cache device, a cache device, or the like, the device that has issued the transmission request or the authentication request is set as a candidate for a receiving device. If no non-cache device issues a transmission request or an authentication request, the receiving device candidate determination means 3 searches for a cache device from the devices connected to the digital bus 54 and authenticates the cache device. Send a command instructing it to issue a request. If no cache device is connected, one of the non-cache devices may be selected and a command may be sent to instruct the non-cache device to issue an authentication request. Thus, the receiving device candidate determining means 3 determines receiving device candidates.

Next, the receiving device grouping means 13
The types of the receiving devices are determined from the candidates determined by the receiving device candidate determining means 3 and are grouped. The grouping method authenticates whether a candidate for a receiving device is a cache device. If the candidate receiving device succeeds in the authentication with the receiving device grouping means 13, it is determined that the receiving device is a cache device. If the authentication fails, it is determined that the receiving device is a non-cache device. Furthermore, cache devices are divided into different groups for each device. Also, all the non-cache devices are put together into one group. At present, the receiving device grouping means 13 is divided into three types of groups A, B and C. In A, all the devices in the non-cache group are registered. In B, one device of the cache group is registered. Another device of the cache group is also registered in C.

Next, the key generation means 14 generates a key for decrypting data in each group grouped by the reception device grouping means 13. This key is different for each group. That is, data encrypted with the group A key cannot be decrypted with the group B key.

The authentication means 9 performs authentication with devices belonging to each group, and when authentication is successful, encrypts a key determined for each group with a temporary key used for authentication.
The key distribution means 15 distributes the key distribution device to the devices of the group. In this way, devices that are candidates for receiving devices are grouped before outputting data to the digital bus, and a different key is distributed to each group, so that the device that receives data can be selected. Become.

The transmission requesting unit 18 detects from which group the transmission request is issued, and based on this, the transmission group determining unit 17 determines which group key to encrypt and transmit the data. The encryption means 8 encrypts data using the determined group key, and
Output to 4. As described above, since the key is different for each group, data can be decrypted only for the determined group.

In this way, it is possible to select a device as described in the second embodiment.

Finally, the criterion by which the transmission group determining means 17 determines which group key to encrypt and transmit data will be described below.

That is, the first judgment criterion is to judge the receiving device which first issued the data transmission request to the transmission selecting means 1 as the actual receiving device. The second determination criterion is that the viewer prioritizes the receiving devices, and determines that the receiving device is an actual receiving device from the one with the highest priority. A third criterion is to judge the receiving device that last sent the data transmission request to the transmission selecting means 1 as an actual receiving device. The fourth criterion is that, among the candidates for the receiving device, the cache device is prioritized over the non-cache device and is determined as the actual receiving device. The fifth criterion is to determine the actual receiving device by giving priority to the non-cache device over the cache device among the receiving device candidates. A sixth criterion is to determine the actual receiving device based on the capability of the device such as the recording time and the number of simultaneous recording channels. For example, a device having a long recording time and a large number of channels that can be simultaneously recorded is determined as an actual receiving device. A seventh criterion is to determine the actual receiving device based on the frequency of use of the device. For example, determining the most frequently used receiving device as an actual receiving device. Alternatively, the least used receiving device is determined as an actual receiving device.

The criteria for the transmission group determining means 17 to determine which group key to encrypt and transmit data has been described above.

In the present embodiment, the partner device using the data is selected by passing the key for decrypting the data, but in addition to this, it becomes a candidate for using the data. It is also possible to notify the device of the other party in advance whether or not the data can be used in advance. In this way, since it is possible to know whether or not the destination device can use the data, it is not necessary to perform the process of decoding the transmitted data, and the load on each device can be reduced. .

(Fourth Embodiment) Next, a fourth embodiment will be described with reference to the drawings.

In this embodiment, an STB will be described as an example in which the transmission selecting means 1 described in the second or third embodiment is incorporated in an actual device. This STB functions as a transmitting device.

In FIG. 3, an antenna 19 is means for receiving a broadcast wave broadcast from a broadcasting station. The tuner unit 20 is a unit that selects a program based on a broadcast wave and outputs a transport stream. The transport stream decoder unit 21 is means for decoding a transport stream and detecting CGMS. The EMI providing unit 22 generates EMI from the detected CGMS,
It is a means for giving. The digital I / F unit 23 is a unit that exchanges data and commands with the digital bus 54. The transmission selecting means 1 selects whether to transmit the copyrighted data to the cache device or the non-cache device, and is the same as any one described in the second or third embodiment.

Next, the operation of this embodiment will be described.

The broadcast wave transmitted from the broadcast station is C
GMS is embedded. The tuner unit 20 receiving this broadcast wave selects a program. The selected program is
It is passed to the transmission selection means 1 as a bit stream. At the same time, it is also passed to the transport stream decoder 21 and decoded. When decoding, the CGMS is detected, and the EMI adding means 22 generates EMI from the CGMS. Further, the transmission selecting means 1 performs the same processing as described in the second or third embodiment, and in the case of data for which copyright has been claimed, which transmission destination device depends on the content of the copyright. Select whether data is available. Furthermore, the copyrighted data is encrypted, and the digital I /
Output to F means 23. At this time, the EMI generated by the EMI providing means 22 is provided.

As described above, by incorporating the transmission selecting means 1 into the STB, the transmission device transmits data to the cache device while protecting the contents of the copyright. You can watch the program at any time other than
In the case of y one generation, data can be moved at an arbitrary time.

(Fifth Embodiment) Next, a fifth embodiment will be described with reference to FIG.

In this embodiment, an example of a TV monitor will be described as an example of a non-cache device.

The digital I / F means 27 is connected to the digital bus 5
4 is a means for receiving data from and exchanging commands. The EMI detection means 28 is a digital I / F means 27
This is a means for detecting EMI from the data sent from. When receiving the copyrighted data, the authentication / decryption unit 29 performs authentication with the device that transmits the data,
When authentication is successful, it is a means for receiving a key for decrypting the encrypted data and decrypting the data. The transport stream decoder 21 decodes the decoded data (transport stream) and separates the multiplexed data. The AV stream decoder 24 is a means for expanding the compressed MPEG data and outputting it while maintaining AV synchronization. This is a means for separating multiplexed data. The D / A converter 25 is means for converting the expanded AV digital data into an analog signal. The display device 30 is a means for displaying an analog signal on a display.

Next, the operation of the present embodiment will be described.

First, the authentication / decryption means 29 issues an authentication request for receiving data, and performs authentication with the device on the data sending side. If the authentication is successful, a key used for decrypting the data is transferred with the key temporarily used at the time of the authentication. At the same time, the EMI detecting means 28
To detect EMI. In accordance with the value of EMI, the authentication / decryption unit 29 determines whether to decrypt the data using the key for decrypting the data. When the authentication / decryption unit 29 decrypts the data, the data is passed to the transport stream decoder unit 21 to separate the multiplexed data. Further, the AV stream decoder unit 24
To decompress the MPEG data. The D / A converter 25 converts the digital data into an analog signal, and
Monitors the analog signal.

The TV monitor having such a normal configuration can function as a non-cache device even in a situation where a cache device and a non-cache device exist.

(Sixth Embodiment) Next, a sixth embodiment will be described with reference to FIGS.

In this embodiment, a hard disk device functioning as a cache device will be described.

FIG. 5 is a basic configuration diagram of the hard disk device of the present embodiment.

The hard disk device includes a digital I / F unit 31, a stream control unit 32, an LBA access unit 33, a hard disk control unit 34,
Actuator means 35, disk medium 36, head 3
7. It comprises a spindle motor means 38.

The digital I / F means 31 is an IEEE13
A 94 bus is a means for exchanging data and commands with the digital bus 54. Digital I / F means 31
AV data transfer is performed by isochronous (Isochron)
The transfer is performed by a transfer method called an "onous" method, and transfer processing can be performed while real-time property of transferred data is guaranteed. The data to be transferred includes, for example, an MPEG transport stream and a DV stream. The control of the AV device by the digital I / F means 31 is performed by an asynchronous transfer method called an asynchronous method. The stream control means 32 is a means for performing stream access and authentication processing. The LBA access means 33 is an LBA
This is an I / F means inside the hard disk device for accessing the disk medium by specifying (logical block address). The hard disk control unit 34 is a unit that controls the actuator unit 35 and the spindle motor unit 38 and performs signal processing for recording and reproducing data on and from the disk medium 36 via the head 37. The head 37 includes a disk medium 36
Means for recording and reproducing signals. The spindle motor means 38 is means for rotating the disk medium at a constant speed. The actuator means 35 is means for positioning the head 37 at a target position on the disk medium 36.

The stream control means 32 of the hard disk device shown in FIG. 5 is configured as shown in FIG.

That is, the stream control means 32
EMI detecting means 39, EMI adding means 44, EMI
It comprises access means 40, EMI determination means 41, authentication / decryption means 42, invalid data output means 45, stream access means 48, playback information management means 43, data block access means 47, changeover switch 46, and transmission selection means 1. You.

The EMI detecting means 39 is a means for detecting a field describing EMI from a header part in the isochronous packet data input from the digital I / F means 31. The EMI adding means 44 is a digital I / F
This is a means for adding the designated EMI to the header portion in the isochronous packet data output to the means 31. The EMI access unit 40 is a unit that reads out the detected EMI information via the LBA access unit 33, and records and reproduces the detected EMI information corresponding to the specified data block. The EMI determination means 41
This is a means for judging whether or not a copyright has been claimed from the MI information and its type. The authentication / decryption unit 42 performs authentication between the AV devices via the digital I / F unit 31,
It is a means for decoding AV data input from the digital I / F means 31. The data block access means 47 records or reproduces the data of the designated block number via the LBA access means 33, and determines which block number is currently being accessed by the EMI access means 40 and the reproduction information management means. 43. The stream access means 48 is a digital I / F
Data block access means 4 for executing a command according to a predetermined access scheme received from means 31
7, a block number to be recorded or reproduced is designated, and the user area of the disk medium 36 shown in FIG. 5 is regarded as a single tape from the first data block to the last data block. In accordance with such an instruction, the stream pointer management indicating the current block position of the stream is performed, and the stream pointer management information is recorded on or read from the disk medium 36 via the LBA access unit 33. Here, the predetermined access method is, for example, AV / C
Digital Interface Command
d Set VCR subunit Specifi
This is a method based on the Cation Version 2.0.1. The changeover switch 46 is connected to the EMI provision unit 44.
When the AV data is output to the digital I / F unit 31 via the interface, if the reproduction has been completed, the switch is turned off or the switch to the invalid data output unit 45 is performed according to the result of the reproduction information management unit 43. In this case, invalid data such as a blue screen or a black screen is output, and when the data is not reproduced, the switch is switched to the authentication / decryption means 42 to output the encrypted AV data. Playback information management means 4
Numeral 3 is means for recording and reading reproduction information corresponding to the specified data block, and for judging from the reproduction information whether or not reproduction has been completed. The transmission selecting means 1 is the same as that described in the second embodiment or the third embodiment.

Next, the operation of this embodiment will be described.

First, the recording operation of the hard disk device will be described.

The STB will be considered as a device from which AV data is sent. This STB is provided with the transmission selecting means 1 in the transmitting apparatus of the present invention. In addition, there is a controller that sends a recording start command, a recording stop command, and the like to the hard disk device via the IEEE 1394 bus. However, describing the exchange of commands between the controller and the hard disk device is described in the gist of the present embodiment. Therefore, the description is omitted in the present embodiment.

First, the hard disk drive is
The authentication / decryption unit 42 issues an authentication request to the TB. Thus, in the transmission selecting means 1 on the STB side, the present hard disk device becomes a receiving device candidate. Next, when the hard disk device receives the recording start command from the digital I / F unit 31, the digital I / F unit 31 confirms the channel number desired by itself, and takes in the corresponding isochronous packet data. EMI detection means 39
Detects EMI information held in the header portion of the captured isochronous packet data. EM
The I determination unit 41 determines whether or not the copyright is claimed from the detected EMI information and the content thereof. It is assumed that the transmission selecting means 1 on the STB side recognizes the hard disk device as a cache device and finally selects the hard disk device as a specific one cache device for transmitting AV data. The authentication / decryption unit 42 receives the key sent from the STB via the digital I / F unit 31. However, when EMI is copyfree,
The decryption means 42 does not receive the key from the STB. In this case, the AV data itself is not encrypted. EMI is co
py never and EMI are copy one
Generation and EMI are nomore
In the case of copy, the authentication / decryption means 42 receives the key.

The authentication / authentication via the digital I / F means 31
The decoding means 42 determines that the EMI of the AV data is copy f
If not, the AV data is decoded. When the EMI is copy free, the authentication / decryption unit 42 passes the AV data because the AV data is not encrypted. The stream access unit 48 instructs the data block access unit 47 to record the block x. The data block access unit 47 receives the block number (=
x) is notified. The EMI access unit 40 records the EMI information detected by the EMI detection unit 39 in association with the notified block number. Since the hard disk device of the present invention functions as a cache device,
When I is copy one generation, when recording EMI information on the disk medium 36, the EMI is recorded without being rewritten to no more copy. The data block access means 47 notifies the reproduction information management means 43 of the block number (= x) currently being accessed. The reproduction information management means 43 stores the reproduction information in a table in association with the notified block number (= x) at the time of recording. Further, information that the data has not been reproduced is registered in the reproduction information. That is, play_fla
The reproduction information is initialized at g = 0. Next, the reproduction information management unit 43 records the reproduction information on the disk medium 36 via the LBA access unit 33. Next, the block number is increased by one. That is, x = x + 1. Next, it is determined whether or not another command is received from the digital I / F unit 31. If another command has been received, the process ends. Otherwise, the process after receiving the recording command is repeated until another command is received. The above is the case where the AV data is recorded on the disk medium 36.

Next, the reproducing operation of the hard disk device will be described. The destination device receiving the AV data is TV
The case of a monitor will be described. Also, there is a controller that sends a reproduction start command, a reproduction stop command, and the like to the hard disk device. However, since the description of the command exchange between the controller and the hard disk device deviates from the gist of the present embodiment, The description is omitted in the present embodiment.

First, the TV monitor issues an authentication request to the hard disk device. As a result, in the transmission selecting means 1 of the hard disk device, the TV monitor becomes a candidate for the receiving device. Next, the operation of the transmission selecting means 1 described in the second or third embodiment authenticates the TV monitor (non-cache device) and passes the key. Next, when the hard disk device receives the playback start command,
The stream access unit 48 instructs the data block access unit 47 to reproduce the block x. The data block access unit 47 includes: an EMI access unit 40;
The reproduction information management unit 43 is notified of the block number (= x) currently being accessed. At the same time, the data block access means 47 reads AV data from the disk medium 36 via the LBA access means 33. The EMI access unit 40 reads EMI information corresponding to the notified block number from the disk medium 36. EM read
The I information is determined by the EMI determination unit 41, and the determination result is sent to the transmission selection unit 1, the reproduction information management unit 43, and the authentication / decryption unit 42.

In the EMI determination result, EMI is copy fr
In the case of ee, the transmission selecting means 1 does not encrypt the data,
The V data is output without being encrypted. If the EMI is not copy free, the transmission selecting means 1 encrypts and outputs the data. At the time of reproduction, the reproduction information management means 43 updates the reproduction information and checks the judgment result of the read EMI information.

If EMI is not copy free,
The reproduction information management unit 43 determines whether the AV data has not been reproduced or has been reproduced. EMI is copy ne
If it is ver and the reproduction has been completed, the changeover switch 46 is switched to the invalid data output means 45 side, and invalid data such as a blue-back screen or a black screen is output.

Next, the block number is incremented by one. That is, x = x + 1. Next, it is determined whether or not another command is received from the digital I / F unit 31. If another command has been received, the process ends. When the reproduction processing is completed, the reproduction information management unit 43 accesses reproduction information from the initial value number to the final value number of the reproduced block, and reproduces the reproduction information, that is, the play_flag.
= 1. Otherwise, the process after receiving the reproduction command is repeated until another command is received. The above is the case of reproducing AV data.

When the EMI of the AV data recorded on the hard disk device is not copy free, the reproduction information management means 43 switches the changeover switch 46 and the reproduction information management means 17 manages the reproduction information. AV data that is not copy free can be reproduced only once.

The reproduction information management means of the present embodiment
The EMI access unit and the data block access unit are examples of the recording unit of the present invention, and the EMI access unit, the reproduction information management unit, the data block access unit, and the changeover switch of the present embodiment are examples of the recording unit of the present invention. .

(Seventh Embodiment) Next, a seventh embodiment will be described with reference to FIG.

In the present embodiment, S in the fourth embodiment is used.
A case where an analog monitor is connected to the TB will be described.

In the present embodiment, a description will be given focusing on differences from the fourth embodiment.

An STB as a transmitting apparatus according to the present invention includes an AV stream decoder 24 and a D / A converter 25 in addition to the configuration of the fourth embodiment, and is connected from an analog terminal to an analog monitor. The received program can be viewed on an analog monitor.

The AV stream decoder section 24 outputs the MP stream output from the transport stream decoder section 21.
This is means for expanding EG data. D / A converter 25
Is means for converting the expanded digital data into an analog signal.

Next, the operation of this embodiment will be described.

The broadcast wave transmitted from the broadcasting station is selected by the transmission selecting means 1 so that the data can be used in accordance with the copyright by selecting the other party's equipment in the second and third embodiments. It was explained in. However, since an analog monitor is connected to the STB, data can always be viewed. Therefore, when data is output to the digital bus 54 while being viewed on an analog monitor, there is a problem that copyright cannot be protected.

Therefore, in the present embodiment, when the transmission selecting device 1 makes data available to the cache device, the changeover switch 26 is turned off so that no data is output to the analog monitor. Alternatively, the data may be output to the analog monitor in a scrambled state without using the changeover switch 26.

In order to do this, the transmission selecting means 1
The mode or group stored in the mode storage unit 2 or the current transmission group storage unit 16 is referred to. If the mode or group is the one of the cache device, the changeover switch is turned off as described above. You only have to scramble the data.

By doing so, the copyright can be protected even when a monitor is connected to the STB.

Although the transmission apparatus has been described in the present embodiment, the same processing can be performed on a cache apparatus to which a monitor is connected, so that data can be output while protecting copyright. .

Further, the digital I / F means of the present embodiment is an example of the output means of the present invention, and may be an IEEE1394 interface or an interface of another standard.

Furthermore, in the present embodiment, description has been made mainly using EMI. However, the present invention is not limited to this, and CGMS can be used, and EMI and CGMS can be used together.

Furthermore, the cache device of the present invention is not limited to the hard disk device in
In short, a device capable of recording and reproducing, such as an optical disk device and a DVD-RAM device, can also be used as a cache device. However, in that case, as described in the sixth embodiment, it is necessary to provide the recording means, the reproducing means, and the transmission selecting means of the present invention.

Further, in the configuration example of the cache device of the present invention, except for the transmission selecting means 1,
Any device can be used as long as it can realize the function of reproducing once only in accordance with I or CGMS. Some embodiments are described in, for example, Japanese Patent Application No. 10-3125.
The recording / reproducing apparatus disclosed in U.S. Pat. No. 96 has been briefly introduced in the related art.

Further, in the transmission device or the cache device according to the present invention, copy never and copy o
ne generation and no more co
If the key for encrypting / decrypting the py AV data is different, the security can be improved. Also cop
y never and copy one generati
The authentication method for passing / obtaining the on and no more copy keys may be a different authentication method. For example, copy never uses a public key method and copy
one generation and no more co
py can use a common key method. This further improves safety.

Further, the functions of the components of the transmission device or the cache device of the present invention may be realized by dedicated hardware, or may be realized by software by a computer program.

Furthermore, a program recording medium characterized by storing a program for causing a computer to execute all or a part of the functions of each component of the transmission device or the cache device of the present invention also belongs to the present invention. .

[0149]

As is clear from the above description, the copyright of the claimed data can be protected as intended by the author, and the data is different from the time when the data was broadcast. You can view the data at any time, and if a monitor is connected and a monitor is connected, the copyright must be protected as intended by the author when the data is claimed to be copyrighted. Device, a cache device, a transmission device, and a program recording medium.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission selection unit according to a second embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmission selection unit according to a third embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an STB as a transmission device according to fourth and seventh embodiments of the present invention.

FIG. 4 is a block diagram showing a configuration of a TV monitor as a non-cache device according to a fifth embodiment of the present invention.

FIG. 5 is a block diagram showing a basic configuration of a hard disk device as a cache device according to a sixth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a stream control unit of a hard disk device as a cache device according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a state in which a cache device and a non-cache device are connected to a digital bus according to the first embodiment of the present invention.

FIG. 8 is a block diagram showing that each device is connected to a digital bus according to the first embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission selection means 2 Mode storage means 3 Reception device candidate determination means 4 Reception device determination means 5 Mode determination means 6 Notification means 7 Key generation & output means 8 Encryption means 9 Authentication means 10 Changeover switch 11 Non-cache device 12 Cache device 13 Receiving device grouping unit 14 Key generation unit 15 Key distribution unit 16 Current transmission group storage unit 17 Transmission group determination unit 18 Transmission request detection unit 19 Antenna 20 Tuner unit 21 Transport stream decoder unit 22 EMI adding unit 23 Digital I / F Means 24 AV stream decoder section 25 D / A conversion section 26 Changeover switch 27 Digital I / F means 28 EMI detection means 29 Authentication / decryption means 30 Display device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideaki Takechi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Hiroyuki Iizuka 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. BB04

Claims (17)

[Claims] Recording means for recording data; and when the data is copyrighted, reproducing the data only once without changing the content of the copyright claim of the data recorded by the recording means. A cache device connected to a plurality of destination devices, wherein, among the connected destination devices, data reproduced by the playback device is copyrighted to any destination device. And a transmission selecting means for selecting whether or not to make use possible according to the contents of the cache device. 2. The transmission selecting means, when sending copyrighted data, when there is at least one device having the function of the cache device among the destination devices, Only one device having the function, or, except for the device having the function of the cache device, all the devices having no function of the cache device can use the data according to the content of the copyright, 2. The cache device according to claim 1, wherein when there is no device having the function of a cache device, the data is made available to all of the destination devices in accordance with the contents of the copyright. . 3. The apparatus according to claim 2, wherein the transmission selection means selects the destination apparatus by passing a key for decrypting the encrypted copyrighted data to the destination apparatus. 3. The cache device according to claim 1, wherein 4. The transmission selecting means distributes in advance a key for decrypting data to the connected destination device, and encrypts the copyrighted data with any key. 3. The cache device according to claim 1, wherein the destination device is selected according to the condition. 5. The transmission selection means performs authentication with the destination device before passing the key to the destination device, and passes the key only when the authentication is successful. 5. The cache device according to 3 or 4. 6. The transmission selecting means searches for the cache device and receives the key in the cache device when none of the destination devices not having the function of the cache device has received the key. 6. The cache apparatus according to claim 5, wherein an instruction to issue an authentication request is issued. 7. The transmission selecting means encrypts the key with a temporary key used at the time of authentication with the partner device when transferring the key to the partner device, and transmits the key to the partner device. 6. The cache device according to claim 5, wherein said cache device is passed to said device. 8. The cache device according to claim 1, wherein the transmission selection unit does not encrypt the data when the data is not copyright-free (copy free). . 9. The contents of the copyright include a copy never permitting viewing only once,
Allow copying only once (copyoneg
The cache device according to any one of claims 1 to 8, wherein the cache device is any one of (eneration) and no more copy is permitted (no more copy). 10. The cache device according to claim 1, wherein one of the connected destination devices is a monitor directly connected to the cache device. 11. A transmitting device connected to a plurality of destination devices, comprising: an output unit for outputting data, wherein the transmission device outputs data output by the output unit among the connected destination devices. 11. A cache device according to any one of claims 1 to 10, further comprising: transmission selection means for selecting whether or not the destination device can be used in accordance with the content of the copyright. A transmission device comprising at least one device or no device. 12. The transmission selecting means, when sending copyrighted data, when there is one or more devices having the function of the cache device among the devices of the other party, Only one device having the function, or, except for the device having the function of the cache device, all the devices having no function of the cache device can use the data according to the content of the copyright, 12. The transmitting apparatus according to claim 11, wherein when there is no apparatus having the function of the cache apparatus, the data is made available to all of the destination apparatuses in accordance with the contents of the copyright. . 13. An analog output means for outputting data in an analog manner; and a digital output means for outputting the data in a digital form. When the digital output means outputs digitally claimed data, the analog output means A transmitting device for disabling analog output. 14. A recording / reproducing apparatus comprising: recording means for recording data; and reproducing means for reproducing the data only once without changing the contents of the copyright when the data is copyrighted. When the digital output means digitally outputs the copyrighted data,
14. The transmitting apparatus according to claim 13, wherein an analog output of said analog output means is invalidated. 15. The transmitting apparatus according to claim 11, wherein one of the connected destination apparatuses is a monitor directly connected to the transmitting apparatus. 16. The content of the copyright means copy prohibition (copy never) permitting viewing only once.
r) Allow one-time duplication (copyon
The transmission device according to any one of claims 11 to 15, wherein the transmission device is one of: (e generation), and no more copying is permitted (no more copy). 17. A program for causing a computer to execute a part or all of the functions of each component of the cache device or the transmission device according to any one of claims 1 to 16 is stored. Program recording medium.