JP2001285821A - Limited reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and method for limited reception which repeats contents transmitted from a broadcasting center with simple constitution without descrambling at a repeating station and allows the repeating station to uniquely perform the viewing control of a terminal device. SOLUTION: Since unique information required for viewing is added to a part of a broadcasting signal, that is transmission control information, e.g. in the case of repeating the broadcasting signal from the broadcasting center at a CATV station, the CATV station is capable of performing unique viewing control in spite of performing modulation/conversion/retransmission of contents transmitted from the broadcasting center with simple constitution without descrambling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to conditional access for transmitting scrambled contents such as video, audio or data transmitted from a center device of a digital broadcasting system to a terminal device via a relay device such as a CATV station. In particular, the present invention relates to a system in which viewing and control of a terminal device is enabled by a relay device of a modulation conversion system.

[0002]

2. Description of the Related Art Conventionally, digital broadcasting and digital CATV
In the field of broadcasting, in order to effectively use communication resources, programs provided by a plurality of broadcasters are multiplexed and transmitted through one channel. This is, for example, in BS digital broadcasting (multiple TS transmission format thereof), TMCC (Transmission Multiplexing Configuration C).
Ontrol) is transmitted by being superimposed on the packet synchronization signal, and the receiving side can extract a plurality of TSs from one frequency band based on the TMCC signal.

In the conventional retransmission method, a CATV station retransmits a scrambled stream transmitted from a broadcast center or the like to a CATV terminal device.
There are two known modulation conversion schemes and remultiplexing schemes. In the modulation conversion system, the stream is retransmitted only by changing a part of the program sequence information without performing descrambling and re-scrambling of the content in the CATV station. In this system, all the conditional access management is performed in the broadcasting center.
On the other hand, in the re-multiplexing method, the CATV station descrambles the received stream once, adds its own conditional access information, and re-scrambles the content at the same time.
Send it to the ATV terminal.

FIG. 14 shows a main part of a system configuration of a conventional modulation conversion system. Broadcasting center 1401 and CAT
The V station 1409 is connected by a satellite line using a satellite 1408, and the CATV station 1409 and the terminal device 1415 are connected by a CATV line.

[0005] The broadcast center 1401 sends a content server 1402 that sends out content such as video and audio, and an identifier (PID) and a scramble key (Ks) for identifying the content to a scrambler 1405, and encrypts the shared information. A conditional access control unit 1504 for transmitting information (ECM) and individual information (EMM) to the multiplexing unit 1403, a multiplexing unit 1403 for multiplexing the ECM, EMM and content into one stream, PID
And a transmission unit 1406 that modulates the stream and sends it out to a satellite line via a transmission antenna 1407.

[0006] The CATV station 1409 receives a stream from a satellite line via a reception antenna 1410,
A receiving unit 1411 that performs demodulation processing and program arrangement information (PS
PSI conversion unit 1412 for converting a part of I) from a satellite transmission use to a cable transmission use, a QAM modulator 1413 for modulating a signal into a QAM method specified by CATV, and a modulated stream to a CATV transmission frequency. And a frequency conversion unit 1414 for converting and transmitting the converted data to the CATV network.

In the broadcasting center 1401 of this system,
The content server 1402 transmits content including video and audio to the multiplexing unit 1403.

[0008] The conditional access control unit 1404 uses an ECM having a determination area for determining permission to view the content and a Ks obtained by scrambling the content as a work key (K
w), and transmits to the multiplexing unit 1403, and an EMM having a contract information area for giving permission to each terminal device 1415 to view the content and an ECM-encrypted Kw.
Is encrypted with a master key (Kmi) unique to each terminal device 1415 and transmitted to the multiplexing unit 1406. Further, conditional access control section 1404 transmits PID and Ks for identifying the content to be scrambled to scrambler 1405.

A multiplexing unit 1403 multiplexes the received content with the ECM and EMM as one stream and transmits the multiplexed data to a scrambler 1405. The scrambler 1405 selects the PID specified by the conditional access control unit 1404 from the received stream. The content is scrambled and transmitted to the transmission unit 1406. Transmission unit 14
Reference numeral 06 performs transmission processing such as modulation according to the satellite line, and transmits the stream to the satellite line via the transmission antenna 1507.

On the other hand, in the CATV station 1409, the receiving unit 1
A stream 411 receives a stream from a satellite line via a reception antenna 1410, performs a reception process such as demodulation, and transmits the stream to a PSI conversion unit 1412. The PSI conversion unit 1412
A network management table (NIT), which is a part of SI and is used to transmit information relating transmission line information such as a modulation frequency to content, is converted from satellite transmission use to cable transmission use and transmitted to the QAM modulator 1413. And
The QAM modulator 1413 modulates the signal into a QAM method specified by CATV and transmits the modulated signal to the frequency converter 1414. The frequency converter 1414 converts the stream into a CATV transmission frequency and sends the stream to the CATV network.

[0011] The terminal device 1415 receives the stream from the CATV network, decodes the EMM directed to itself, holds the contract information and Kw, and, when viewing the scrambled content, first attaches the content to the content. ECM
Is received and decrypted with Kw, and the determination area in the ECM is compared with the contract information to check whether or not viewing is permitted. If it is determined that "viewing permission exists", the content can be descrambled using Ks in the ECM and can be viewed.

As described above, in the modulation conversion method, the CAT
The V station 1509 simply converts the stream into a modulation scheme suitable for the CATV network, and does not need to decode the ECM or EMM, and can relay without being involved in the content of the stream. In this method, the center equipment is small-scale and
Although it can be realized at low cost, each terminal device 141
5 viewing control based on conditional access
1 does.

FIG. 15 shows a CA as a remultiplexing repeater for adding unique conditional access information at a CATV station.
It is a figure which shows the principal part of a TV station.

The broadcast center 1501 and the CATV terminal 151
7, the broadcast center 1501 and the CATV station 150
9 is connected by a satellite line using a satellite 1508, and C
The point that the ATV station 1509 and the terminal device 1517 are connected by a CATV network is the same as in the modulation conversion method.

The CATV station 1509 is connected to the receiving antenna 15
A receiving unit 15 that receives a stream from a satellite line via the communication line 10 and performs reception processing such as demodulation including scramble decoding
10, 1511-1 to 1511-3, a conditional access control unit 1513 that sends PID and Ks to a scrambler 1514, and sends an ECM and an EMM to a multiplexing unit 1512, and outputs from each receiving unit and CATV transmission. Multiplexing unit 1512 for multiplexing the ECM and EMM with the program arrangement information (such as NIT), and a scrambler 15 for scrambling the content having the designated PID in the stream with Ks
14, a QAM modulator 1515 that modulates a signal into a QAM method specified by CATV, and a frequency conversion unit 1516 that converts a modulated stream into a CATV transmission frequency and sends it to the ATV network.

The broadcast center 1501 of this system performs exactly the same operation as the modulation conversion method. CATV station 1509
Then, the receiving units 1510 and 1511-1 to 1511-3 receive the stream from the satellite channel via the receiving antenna 1510, perform reception processing such as demodulation including scramble decoding, and multiplex the content in the transport stream format into the multiplexing unit 1512. Send to The multiplexing unit 1512 multiplexes a plurality of transport streams on one transmission line, and at the same time, program arrangement information (NIT or the like) for CATV transmission and the EC transmitted from the conditional access control unit 1513.
The M and EMM are multiplexed and sent to the scrambler 1514.

The scrambler 1614 is provided for the conditional access control unit 15
13, scrambles the content having the PID similarly transmitted from the conditional access control unit 1513, transmits the scrambled content to the QAM modulator 1515, and the QAM modulator 1515 transmits the QAM specified by the CATV. And modulates the signal to the frequency converter 1516.
The frequency converter 1516 converts the stream to a CATV transmission frequency and sends it out to the CATV network.

As described above, in the remultiplexing method, CATV
Station-specific conditional access can be added.

[0019]

However, in the conventional modulation conversion system, since the conditional access system at the broadcasting center is directly used by the CATV terminal, the terminal is connected to the CATV line without permission, and the CATV station transmits the signal from the CATV station. Unauthorized viewing of the retransmitted content without permission may occur.

For example, if signal demodulation means corresponding to CATV is provided at the front end of a direct receiving terminal capable of directly receiving a broadcast from a broadcasting center through a satellite line, retransmission contents transmitted through the CATV line can be transmitted. It becomes possible to watch. These receiving terminals are C
Even if a connection is made to a CATV line without the permission of the ATV operator, the CATV station cannot recognize the connection. Therefore, the CATV station cannot collect the viewing fee for the user of this terminal.

In order to avoid such a situation, it is required that a CATV operator manages a CATV terminal and can execute independent viewing control.

On the other hand, in the conventional remultiplexing method, after a stream transmitted from a broadcasting center is demodulated into a transport stream format, information on conditional access is added in the same manner as in the broadcasting center, so that descrambling and re- It is necessary to install stream processing equipment such as scrambling and a conditional access system having the same means as a broadcasting center, which causes a CATV station to become large-scale and high-cost.
The present invention solves these conventional problems,
It is an object of the present invention to provide a conditional access system that can restrict viewing of retransmitted content only to terminal devices permitted by a CATV station while employing a modulation conversion method.

[0023]

Accordingly, in the present invention, there is provided a method for controlling
One or more center devices and one or more relay devices are connected by a first transmission line, the relay device and one or more terminal devices are connected by a second transmission line, and the center is connected by the first transmission line. A first stream including the scrambled content, the encrypted EMM, and the encrypted ECM is transmitted from the device to the relay device, and the relay device transmits the scrambled content, the encrypted EMM, and the encrypted stream. ECM
In the conditional access system of the digital broadcasting system that transmits to the terminal device on the second transmission path as it is included in the second stream as it is, transmitting the viewing availability information to the terminal device using transmission control information from the relay device, The front end unit in the terminal device extracts the viewing permission / prohibition information from the transmission control information, and selectively transmits only the stream including the permitted program to the content decoding processing unit for canceling the limited reception provided by the broadcaster. A conditional access system that enables control is provided.

According to this conditional access system, a relay device adopting the modulation conversion system performs conditional reception of a terminal device under its control by using conditional access means of a center device.
Unique viewing restriction using transmission control information generated by the CATV station can be performed.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof.

(First Embodiment) In the first embodiment, a satellite broadcast, which is an example of a conditional access system, is a CAT.
A digital broadcasting system for relaying and broadcasting at the V station will be described.

FIG. 1 is a block diagram showing the overall configuration of this system. Broadcasting center 101 and CATV station 10
5, and the broadcast center 101 and the direct receiving terminal 104
Connected by satellite line 102 using artificial satellite 103,
Content such as video and audio is transmitted from the broadcast center 101 through this line. CATV station 105 and CAT
The V terminal 107 is connected via a CATV line 106, and retransmission contents are transmitted from the CATV station 105 to the CATV terminal 10
7 is transmitted. Broadcasting center 101 transmits broadcast waves to satellite line 102, and direct receiving terminal 104
2 receives radio waves directly. The CATV station 105 relays the broadcast wave received from the satellite line 102 to the CATV line 106, and the CATV terminal 107 transmits the broadcast wave to the CATV line 1
06.

FIG. 2 is an example of a block diagram showing a main part of the internal configuration of the broadcast center 101. The broadcast center 101 reconfigures the TS created by each broadcaster,
Multiplex information (TMCC) for superimposition on one transmission frequency band
To generate one transmission stream, convert the transmission stream to a transmission method suitable for a satellite link, and then transmit the transmission stream to a relay station using a transmission antenna.

The broadcaster 20 in the broadcast center 101
The streams including video and audio generated in the sections 1 to 203 are input to the TMCC processing section 204 as respective transport streams (TS).
In the TMCC processing unit 204, a plurality of broadcasters 201 to 2
In addition to multiplexing the TS No. 03 into one transmission band, the terminal adds a TMCC signal which is information for extracting a stream for each broadcaster from a plurality of TSs. TM
A plurality of TS and TMCC signals in one transmission band generated by the CC processing unit 204 are modulated by the modulation unit 205 into a system suitable for the satellite transmission path, and then transmitted to the satellite line 105 via the transmission antenna 206. Sent.

FIG. 3 is an example of a block diagram showing a main part of the internal configuration of relay station 102. In the relay station 102, a TS for retransmitting from a transmission stream composed of a plurality of TSs transmitted from the broadcast center 101 via the satellite line 105
Select and reconfigure.

In the relay station 102, the broadcast center 101
Are received via the receiving antenna 301, the tuner 302 selects a frequency band, and then inputs the stream to the demodulation unit 303. The demodulation unit 303 outputs T
A plurality of baseband-level TSs including the MCC are demodulated and input to the transmission control signal processing unit 304. The transmission control signal processing unit 304 selects and reconfigures the plurality of TSs, generates a CATV transmission control signal based on the TMCC signal given by the broadcast center 101, and generates the transmission control signal in the control unit 305. The information is also input to the modulation section 306 together with the viewability information independently of the CATV station. After that, the stream generated by the transmission control signal processing unit 304 is modulated by the modulation unit 305 into a system suitable for the CATV transmission system, and transmitted to the CATV line 106.

FIG. 4 is an example of a block diagram showing a main part of the internal configuration of the terminal device 103. The terminal control device 103 is C
A front-end unit 401 that performs stream selection based on the viewing availability information added by the ATV station 102, and a content decoding processing unit 4 that receives a plurality of demodulated TSs from the front-end unit 401 and performs decoding processing of the corresponding content.
It consists of 05.

In the terminal device 103, the relay station 102
The tuner 402 selects a stream transmitted through the CATV line 106, demodulates the stream into a baseband level signal in the demodulation unit 403, and
Enter 4 The transmission control information analysis unit 404 extracts the transmission control information, extracts the viewing permission / prohibition information from the transmission control information, and inputs only the TS including the program selectable by the terminal device to the content decoding processing unit 405. The content decoding processing unit 405 has the same function as a general satellite broadcast receiving apparatus, and performs limited reception processing and video decoding processing on the selected TS as needed. Note that the selection operation by the user is mainly performed on the content decryption processing unit 405, and information necessary for the front end unit 401 to operate is communicated.

The operation of the conditional access system having the above configuration will be described in more detail. Broadcasting center 101
The TMCC processing unit 204 superimposes a stream input from each carrier and outputs the stream in an MPEG2 transport stream format. When a plurality of TSs are mixed at this time, information receivable by the terminal device is transmitted as a TMCC signal in accordance with the stream.

The relay station 102 receives and reconfigures a TS to be transmitted to the CATV from a plurality of demodulated TSs. At this time, the selected single TS is extracted by referring to the TMCC signal added by the broadcast center 101, and transmission control information for retransmitting by CATV based on the TMCC signal is generated and added. I do.

For example, the transmission control information includes a front end unique ID 501 for identifying the front end shown in FIG.
It is composed of content viewability information 502 for making a selective transmission determination to the content decoding unit 405 for each program or front end unique ID.

Further, the viewability information will be described. FIG. 6 shows an example of the viewability information. FIG. 6 shows original network ID and TS-ID as information for program identification.
, And whether viewing is possible or not (1.0) is set in each case, and is managed by the control unit 305 in the relay station 102.

As described above, the relay station 102 inserts the viewability information for independently controlling the terminal viewing into the transmission control information and transmits the information.

In the terminal device 103, frequency information, a program number, and the like regarding the program selected by the content decryption processing unit 405 are input to the front end unit 401. In the front end unit 401, the tuner 402 and the demodulation unit 403 decode the desired TS and the baseband signal of the transmission control information based on the program selection information specified by the content decoding processing unit 405, and Input to 404. The transmission control signal analysis unit 404 extracts and analyzes the viewing permission / prohibition information in the transmission control information, and sends out the viewable TS to the decoding processing unit 405.

With the above operation, the broadcast center 10
2, it is possible to further add a viewing control unique to the CATV station (relay station) without changing the contents of the stream contents created in step 2.

Note that the front end unique ID 501 and the viewing permission / prohibition information 502 are not limited to these, and may include control parameters for viewing control. In addition, a front end unique ID is used as viewing permission information.
It is also conceivable to perform the same viewing permission / prohibition control for all terminals without including the terminal 501. Further, there is a case where the viewability control is performed in a group unit as one operation form of the front end unique ID or as a new ID.

Further, the viewability control may be performed by using the transport stream, the original network ID, and a combination thereof as the viewability information.

Further, the terminal device 103 includes the output control unit 805 shown in FIG.
8 is equipped with corresponding communication means,
Front-end unit 801 and content decryption processing unit 805
Can be operated as an independent device. At this time, as a communication unit in the output control unit 805, for example, a general-purpose serial interface such as IEEE1394, a BS-IF frequency band, or the like may be used.

Further, as shown in FIG.
It is also possible to provide a viewing control module in the front end unit 901 in 03 and store the viewing permission information of the terminal device 103 in advance, and to change the format of the viewing permission information as necessary. At this time, the viewing control module 905 may be a removable medium such as an IC card. It is also conceivable to perform viewability control of a plurality of terminal devices using one view control module 905.

Further, as shown in FIG. 7, the terminal device 1 shown in FIG.
It is also conceivable to have a function of transmitting the program selection information by the content decryption processing unit 1005 in 03 to the tuner of the front end unit 1001, and to perform selection at the RF frequency level.

Further, as shown in FIG.
02, a means for performing an encryption process unique to the relay station on the output of the transmission signal processing unit 1104,
1110, a transmission stream excluding transmission control information;
Alternatively, part or all of the viewability information is encrypted,
By transmitting to the terminal device 103 together with the encryption key information for decryption, the output of the transmission control signal analysis unit 1204 in the terminal device 103 shown in FIG. A configuration for transmitting to the unit 1205 may be used.

Further, the control unit 30 in the relay station 102
At 5, there is provided a means for accumulating the viewability information, which can be repeatedly superimposed on the transmission control information.

Further, the terminal device 103 has a timer means in the front end unit 401, and when the viewing permission / prohibition information is not received for a certain period, all or a part of
The TS output to the content decryption processing unit 405 may not be performed.

Further, a storage means is provided in the front end unit 401 of the terminal device 103, and the received viewability information can be stored and used when a program is selected.

Further, relay station 102 can transmit viewing permission information using a frequency band different from the content, for example, OoB. Alternatively, a physically different line such as a telephone line or the Internet may be used.

Further, the front end unit has a function of holding the front end unique information and the content decoding unit unique information. When these are different, the TS output to all or a part of the content decoding processing unit 405 is not performed. Can also.

(Second Embodiment) In a second embodiment, a satellite broadcast, which is an example of a conditional access system, is a CAT.
Regarding a digital broadcasting system for broadcasting by broadcasting at a V station,
In particular, a case will be described in which transmission control information in a CATV station is transmitted without using a TMCC signal from a broadcast center.

FIG. 13 shows a relay station 1 in this embodiment.
02 is an example of a block diagram showing a main part of the second embodiment, and newly transmits a plurality of TSs in the MPEG format input from the information source 1306 not including the TMCC based on information managed by the control unit 1305. 3 shows a configuration for generating control information. Note that the receiving antenna 1301 to the modulation unit 130
7 is the same as that of the relay station 102 in the first embodiment.

The operation of the conditional access system having the above configuration will be described below. The information source 1306 in FIG. 13 decodes a voluntary broadcast program independently generated by a CATV operator or a current CS broadcast, and
Fig. 3 shows contents in the MPEG transport stream format encoded by the G method. The transmission control signal processing unit 1307 multiplexes the content input from the information source 1306 and adds new transmission control information.
After that, a transmission stream composed of a plurality of TSs is
At 309 and 1310, the signal is converted into a format suitable for the CATV line 106, mixed by the mixing unit 1308 with the satellite broadcast stream including the TMCC signal described in the first embodiment, and transmitted to the CATV line 106. The configuration and functions of receiving apparatus 103 are the same as those in the first embodiment.

In Embodiments 1 and 2, CA
The transmission control information generated by the TV station may be general TSMF information as control information for CATV.

Further, the case where the broadcasting center is a satellite broadcasting station has been described. However, the broadcasting center may be, for example, a terrestrial broadcasting station other than the satellite broadcasting station, and a line may be connected to a relay station that does not pass through a satellite. .

Further, in Embodiments 1 and 2,
Although a case has been described where a wired connection is made from the relay station to the receiving device, a wireless connection may be made from the relay station or the relay slave station to the terminal device.

In the first and second embodiments, the transmission control information transmitted from the relay station is TSMF (Transpor
t Streams Multiplexing Frame: a transmission control signal system in CATV) or TSMF extension specification.

[0059]

As is apparent from the above description, the conditional access system according to the present invention provides a simple method without changing conditional access information and contents on the satellite side when relaying satellite broadcasting in a CATV station. Has a configuration in which the viewing control unique to the CATV station is performed, so that there is an effect that the viewing control of the terminal device can be controlled independently for the CATV station even in the modulation conversion method.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a conditional access system according to a first embodiment of the present invention.

FIG. 2 is an internal configuration diagram of a broadcast center according to the first embodiment of the present invention.

FIG. 3 is an internal configuration diagram of a relay station according to the first embodiment of the present invention.

FIG. 4 is an internal configuration diagram of the terminal device according to the first embodiment of the present invention.

FIG. 5 is a view for explaining viewing availability information according to the first embodiment of the present invention;

FIG. 6 is a diagram for describing viewing permission / prohibition information according to the first embodiment of the present invention.

FIG. 7 is a view for explaining viewing permission / prohibition information according to the first embodiment of the present invention;

FIG. 8 is an internal configuration diagram of the terminal device according to the first embodiment of the present invention.

FIG. 9 is an internal configuration diagram of the terminal device according to the first embodiment of the present invention.

FIG. 10 is an internal configuration diagram of a terminal device according to the first embodiment of the present invention.

FIG. 11 is an internal configuration diagram of a relay station according to the second embodiment of the present invention.

FIG. 12 is an internal configuration diagram of a terminal device according to the second embodiment of the present invention.

FIG. 13 is an internal configuration diagram of a relay station according to the third embodiment of the present invention.

FIG. 14 is a diagram for explaining a conventional modulation conversion system.

FIG. 15 is a diagram illustrating a conventional remultiplexing method.

[Explanation of symbols]

101, 1401, 1501 Broadcasting center 102, 1409, 1509 Relay station 103, 1415, 1517 Terminal device 104, 1408, 1508 Artificial satellite 105 Satellite line 106 CATV line 201, 202, 203 Broadcaster 204 TMCC processing unit 205, 306, 307, 1106, 1107, 130
6, 1307, 1309, 1310 Modulator 206, 1407, 1507 Transmit antenna 301, 1101, 1301, 1410, 1510 Receive antenna 302, 402, 802, 902, 1002, 110
2, 1202, 1302 tuners 303, 403, 803, 903, 1003, 100
3, 1203, 1303 demodulation unit 304, 1104, 1304, 1307 transmission control signal processing unit 305, 1105, 1305 control unit 308, 1108, 1308 mixing unit 401, 801, 901, 1001, 1201 front end unit 404, 804, 904 , 1004, 1204 Transmission control signal analysis unit 405, 806, 907, 1005, 1205 Content decryption processing unit 501 Front end unique ID 502 Viewability information 805, 906 Output control unit 905 Viewing control module 1109, 1110 Encryption unit 1206 Decryption unit 1402 , 1502 Content server 1403, 1503, 1512 Multiplexing unit 1404, 1504, 1513 Conditional reception control unit 1405, 1505, 1514 Scrambler 1406, 1506 Transmission unit 1411, 511 receiver 1412, PSI conversion unit 1413,1515 QAM modulator 1414,1516 frequency converter

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04L 9/32 H04L 9/00 673B // H04N 7/08 H04N 7/08 Z 7/081 (72) Inventor Atsunori Sakurai 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture, Japan Matsushita Electric Industrial Co., Ltd. (72) Inventor Minehisa 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshimasa Goto 1006 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inventor Yoshiji Ishikawa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) CC32 GG14

Claims (21)

[Claims] 1. A digital broadcasting system in which a center device and one or more relay devices are connected by a first transmission line, and the relay device and one or more terminal devices are connected by a second transmission line. A conditional access system, wherein the center device includes at least one transport including scrambled content including video, audio, data, or the like, as needed, and decoding information for descrambling the content. Stream and the first transmission control information for selecting a plurality of transport streams in the relay device or the terminal device, and sends out the first stream to the first transmission path as the first stream; When relaying the first stream received from the first transmission path to the second transmission path, the first transmission control The second transmission control information generated and transmitted to the terminal device based on the information, the viewing permission / inhibition information for the terminal device is added to the second transmission control information, and the second transmission control information is transmitted to the second transmission path as a second stream. A front end unit for judging the viewing availability information, and a decoding processing unit for decoding the content input from the front end unit, from the second stream received from the second transmission path, The front end unit extracts the viewability information, performs viewing control based on the viewability information, selects at least one transport stream unit,
The conditional access system, wherein the content is transmitted to the decryption processing unit, and the decryption processing unit controls access to the content based on the decryption information. 2. The terminal device has front-end specific information for specifying the front-end unit, and the relay device has means for generating the viewability information including the front-end specific information. The conditional access system according to claim 1, wherein the front end unit of the terminal device controls the viewing of the content based on the front end unique information in the viewing availability information. 3. The terminal device has terminal group information that allows designation of terminal devices in a group unit, and the relay device includes the terminal group information and generates the viewing permission / prohibition information. 3. The conditional access system according to claim 1, wherein the front end unit of the terminal device controls the viewing of the content based on the terminal group information in the viewing availability information. 4. . 4. The terminal device includes a selection unit based on a transport stream ID, and the relay device includes a unit configured to generate the viewability information including the transport stream ID. 4. The conditional access system according to claim 1, wherein the front-end unit controls the viewing of the content based on the transport stream ID in the viewing availability information. 5. 5. The terminal device includes a selection unit based on an original network ID, and the relay device includes a unit configured to generate the viewing permission / prohibition information including the original network ID. The conditional access system according to claim 1, wherein the front end unit controls the viewing of the content based on the original network ID in the viewing permission information. 6. The terminal device includes a selection unit for each frequency, and the relay device includes a unit for generating the viewing permission / prohibition information including frequency information for selection. 6. The conditional access system according to claim 1, wherein the front end unit controls the viewing of the content based on the frequency information in the viewing availability information. 7. 7. The relay device further includes means for performing a second encryption on the viewing permission / prohibition information using a second encryption method while keeping the encryption method in the first stream unchanged. Along with the second decryption information for the second encryption, the encrypted viewing permission / non-permission information is transmitted as the second stream, and the front-end unit in the terminal device performs the second decryption on the second stream. 7. The conditional access system according to claim 1, wherein after the viewing permission information is decoded based on the information, the viewing control of the content is performed based on the viewing permission information. 8. A means for newly performing a second encryption on a part or all of the first stream by a second encryption method while maintaining the encryption method in the first stream as it is, in the relay device. Having, together with the second decryption information for the second encryption, transmitting information obtained by encrypting a part or all of the first stream by a second encryption method as the second stream, The front end unit in the terminal device controls the viewing of the content based on the second transmission control information, and performs the second encryption based on the second decryption information in the second stream. 8. The conditional access system according to claim 1, wherein a corresponding decoding process is performed. 9. The conditional access system according to claim 1, wherein said relay device has a means for cyclically superimposing said viewing permission / non-permission information on said second transmission control information and transmitting it. . 10. The terminal device, if the viewing permission / prohibition information has not been received for a specific time, cannot view some or all of the information of the second stream from the second transmission path. The conditional access system according to any one of claims 1 to 9, further comprising: 11. The conditional access system according to claim 1, further comprising means for accumulating said viewability information in a front end unit of said terminal device. 12. The front end unit of the terminal device has means for communicating PSI control information analyzed by the decoding processing unit, and the front end unit controls viewing and listening on a program basis. The conditional access system according to claim 1, wherein: 13. The conditional access system according to claim 1, further comprising a PSI analysis unit in the front end unit of the terminal device, wherein the front end unit performs viewing control on a program basis. 14. The relay device transmits the viewing availability information using a specific frequency band different from the transmission frequency of the second stream, and the terminal device transmits the viewing availability information in the specific frequency band. 14. The conditional access system according to claim 1, wherein a viewing control is performed based on the viewing permission information. 15. The terminal device according to claim 1, further comprising a communication control unit for controlling communication with the decoding unit in the front end unit, wherein the front end unit and the decoding unit are operated independently. The conditional access system according to claim 1. 16. The communication device according to claim 16, wherein the communication control unit of the front end unit in the terminal device has communication control means using a serial IF, and the decoding processing unit has communication control means corresponding to the serial communication. Claim 1
5. The conditional access system according to 5. 17. The communication control unit of the front end unit in the terminal device has frequency changing means for changing a part or all of the second stream to a satellite intermediate frequency, and the decoding processing unit The conditional access system according to claim 15, wherein a part or all of the second stream is output at a satellite intermediate frequency. 18. The relay device has means for holding the front-end unique information of the terminal device and the unique information of the decoding processing unit, wherein the front-end unique information, the unique information of the decoding processing unit, 18. The viewing control of the terminal device is performed based on the contrast of (1).
The conditional access system as described. 19. The terminal device includes means for holding the front end unique information and the unique information of the decoding processing unit in the front end unit, wherein the front end unique information and the unique information of the decoding processing unit are provided. 19. The conditional access system according to claim 18, wherein the viewing control is performed based on both or one of the conditional access systems. 20. The relay device according to claim 20, wherein the relay device does not use the first transmission control information from the center device, and has means for newly generating and transmitting second transmission control information in the relay device. 20. The conditional access system according to claim 1, wherein: 21. The conditional access system according to claim 1, wherein TSMF information is used as said second transmission control information in said relay device.