JP2003319422A - Sending-receiving device and receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a general viewer from picture-recording a commercial broadcasting cutting it automatically and from skipping it automatically in reproduction and to meet a demand to want to investigate and confirm them by other methods than a self-report from a broadcasting station. <P>SOLUTION: A discrimination information intrinsic to the commercial is multiplex-broadcasted during the commercial broadcasting combining it with a ECM so that only a special IC card for the commercial investigation is detected. The discrimination information is prevented from being used by the general viewer by the commercial skip and the like and a third party other than the broadcasting station can investigate and confirm the commercial broadcasting efficiently. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving device and a receiving device for confirming reception of a scrambled free program.

[0002]

2. Description of the Related Art Since June 2002, scramble is planned to be introduced to free programs in BS digital broadcasting from the viewpoint of copyright protection. This scrambled broadcasting is performed, for example, by the same method as the conditional access shown in Japanese Patent Laid-Open No. 2001-169262. In order to obtain the key (Ks) required to unscramble the program, the receiver uses ECM (Entitle Cont
rol Message) and sends this data as a command to the security module. Although the ECM is encrypted, a key (Kw) for decrypting the ECM of the free broadcast ECM is set in advance in the security module. Internally, the ECM is decrypted by this Kw and K
The control information regarding s and the program is output as a response. The receiver uses this Ks to descramble the program and displays it on the monitor.

On the other hand, in commercial free broadcasting, a large number of commercial broadcasts are carried out, and this commercial broadcast is usually broadcast time or broadcast between a broadcasting station and a sponsor through an advertising agency or the like. A contract regarding the content etc. has been concluded.

However, in reality, the broadcast content may differ from the contract, or due to a broadcast accident, so-called commercial thinning, etc., the broadcast may not be performed a predetermined number of times during the contracted period or date and time. There is a request from the Bureau to investigate and confirm these by methods other than self-reporting.

As an example of a conventional commercial broadcast detection method, as disclosed in Japanese Patent Application Laid-Open No. 10-224722,
Utilizing the fact that many commercial broadcasts are performed in the audio multiplex mode, detecting silent parts that occur when the main program and commercial broadcasts are switched, or detecting scene changes in video and narrowing down the commercial parts Although a method and the like have been proposed, in each case, there is a problem that the detection accuracy is not high and a lot of troublesome post-processing is required to detect a specific commercial broadcast.

[0006] As an example of a method for accurately and efficiently performing a specific commercial broadcast, as disclosed in Japanese Patent Laid-Open No. 11-122203, a broadcasting station preliminarily adds unique identification information to the commercial broadcast and broadcasts it. The broadcast of the commercial is confirmed by detecting this on the receiving side.

In this technique, at least it is possible for anyone to easily determine whether it is a commercial or a main program, and it is generally desired that viewers do not want to watch commercial broadcasts if they are not interested. Therefore, as disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2001-309300, there is a problem in that it is also used in a device that automatically cuts and records commercial broadcasts or automatically skips during playback. It was

[0008] Since free broadcasts are made up of advertising fees paid by sponsors on the premise that viewers also watch commercial broadcasts, devices that accurately and automatically cut commercial skips and commercial broadcasts are manufactured. Dissemination is a serious problem for broadcasters and sponsors.

From this viewpoint as well, when scrambling is introduced into free programs in the future, the commercial broadcast is scrambled in the same manner as the main program so that the commercial broadcast and the main program are not easily distinguished by the presence or absence of the scramble. Although expected to be broadcast, the problems of the prior art described above still remain, regardless of whether the commercial broadcast program itself is scrambled.

[0010]

In the case of the above-mentioned conventional system, a general viewer automatically cuts and records the commercial broadcast by utilizing the identification method of the commercial broadcast, or automatically skips at the time of reproduction. This is a serious problem for broadcasters and sponsors. On the other hand, the content of the commercial broadcast that was actually broadcast may differ from the contract, or due to a broadcast accident or so-called commercial broadcast thinning, the broadcast may not be performed a predetermined number of times during the contracted period or date. Yes, there is a request from the broadcasting station to investigate and confirm these by methods other than self-reporting.

The present invention prevents general viewers from automatically cutting and recording commercial broadcasts and automatically skipping them during playback, and it prevents the general broadcaster from automatically broadcasting a commercial broadcast. The purpose is to answer these requests for efficient investigation and confirmation by the three parties.

[0012]

In order to solve the above-mentioned problems, the transmitting / receiving apparatus of the present invention comprises a means for scrambling a main program or a commercial on the transmitter side,
A means for encrypting key information necessary for descrambling the main program or commercial, and of the key information, the key information corresponding to the commercial is added with the identification information of the commercial in the key information in advance. Means and means for appropriately multiplexing and transmitting the key information to a program signal of a main program and a commercial program signal, and at the receiver side, the encrypted key information is transmitted from the signal transmitted by the transmitter. Means for obtaining, means for decrypting the acquired encrypted key information to obtain a key, means for detecting identification information of the commercial in the key information, scramble of the main program or the commercial And the commercial identification information is detected by the identification information detecting unit, the commercial identification information is released. And means for recording as a history,
It is characterized by comprising.

Further, the receiving device scrambles the main program or the commercial while changing the key at a predetermined cycle, encrypts the key information necessary for descrambling, and the key information corresponding to the commercial includes: Identification information of the commercial is added in advance, the key information is appropriately multiplexed with the program signal of the main program and the commercial program signal to receive a transmitted signal, and means for obtaining the encrypted key information, A means for decrypting the acquired encrypted key information to obtain a key, a means for detecting the identification information of the commercial in the key information, a means for descrambling the main program or the commercial. When the commercial identification information is detected by the identification information detecting means, the commercial identification information is sent to the commercial broadcaster. Characterized by comprising and means for recording as.

Further, the receiving device scrambles the main program or the commercial while changing the key at a predetermined cycle, adds the current time information to the key information necessary for descrambling, and encrypts the commercial. Identification information of the commercial and expiration date information for detecting the commercial are added to the corresponding key information in advance, and the key information is appropriately multiplexed with the program signal of the main program and the commercial program signal to receive a transmitted signal. In, a means for decrypting the encrypted key information to obtain a key, a means for detecting the commercial identification information in the key information, a means for obtaining the key and the identification information A means for storing the security module, which is detachable from the receiving device, and sends the encrypted key information to the security module, The security module compares the pre-recorded expiration date information with the current time sent in addition to the key information, and detects the commercial identification information only when the expiration date is not reached. A means for detecting the presence or absence of the commercial identification information by means, and a means for outputting the information together with a key to the scrambler when the commercial identification information is detected. And

The commercial identification information in each of the above-mentioned means is sent in the state of being encrypted in the key information, and the information regarding the encryption system of this key information is not disclosed to the public, so that it is the program main part as it is. It is impossible to discriminate whether the key information is the key information including the commercial identification information or the key information including the commercial identification information. For this reason, while preventing commercial viewers from using the identification information unique to the commercial during commercial broadcasts by skipping commercial broadcasts, etc., a third party other than the broadcasting station can efficiently investigate and confirm commercial broadcasts. It becomes possible to do.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a system configuration diagram of a scrambled broadcast for explaining an embodiment of the present invention. In FIG. 1, there is at least one satellite broadcasting ground station 100 or terrestrial broadcasting station 200 as a station for broadcasting various programs and commercials, and the satellite broadcasting ground station 100 is upgraded to the satellite 300 via a satellite transmission antenna 101. It is a key station that transmits a link radio wave and provides the same program nationwide from the satellite 300. The terrestrial broadcasting station 200 is a local station provided in each region and performs broadcasting via the terrestrial transmission antenna 201 in a frequency band different from that of satellite broadcasting.

At the viewer's house, satellite dish 40
0 or terrestrial broadcasting reception antenna 500 is installed,
A television receiver 600 is connected to these antennas, and an IC card 700 used for descrambling and a monitor 800 for outputting video and audio are further provided to the television receiver 600.
Are connected.

FIG. 2 is a diagram showing a schematic configuration of the satellite broadcasting ground station 100, but the portion related to the description of the present embodiment is the same for the broadcasting system of the terrestrial broadcasting station 200.

Reference numeral 111 is identification information unique to each commercial in the descriptor format shown in FIG. 3, for example. ECM
The ECM data generated by the data generation unit 112 is converted into EC
The data is supplied to the M data encryption unit 113 and encrypted there. Encrypted ECM data and SI / PSI data generator 1
SI (Service Information) generated by 14 and P
SI (Program Specific Information) data is supplied to the packet generation unit 115. Packetized data is
The data is supplied to the packet multiplexing unit 116 as one data to be multiplexed as a transport stream.

The packet generator 119 stores the commercial audiovisual data 117 and the main program audiovisual data 118.
The packetized data is supplied to the packet multiplexing unit 116 as the other data to be multiplexed as a transport stream.

The packet multiplexer 116 outputs the packetized data based on the packet generators 115 and 119 as a multiplexed transport stream. Of the stream sent from the packet multiplexing unit 116, the scramble unit 1 is applied to the video / audio data packet of the main program and the video / audio data packet of the commercial.
In step 19, the scramble key specified in the corresponding ECM packet in the stream is used for scrambling. This is supplied to the modulation / transmission unit 120, modulated by a predetermined modulation method, and then output to the satellite transmission antenna 101.

The series of controls described above are performed by the control unit 121. When generating ECM data corresponding to a commercial video / audio data packet, the control unit 121 acquires from the identification information 111 unique to this commercial broadcast and inputs this to the ECM data generation unit 112.
The ECM data generation unit 112 takes this into the ECM and outputs it as the ECM with the configuration shown in FIG. 4, for example.

The ECM includes a key for descrambling the video / audio data packet of the main program or the commercial video / audio data packet scrambled by the scramble unit 119, which is updated at a predetermined cycle. To be done. Therefore, the ECM packet is multiplexed and transmitted again at least every time the key is updated. FIG. 5 shows an output example of the data stream packetized by the scrambler 119.

FIG. 6 shows an example of the configuration of the television receiver 600 shown in FIG. 1. The television receiver 600 is a satellite broadcast receiving antenna 400 or a terrestrial broadcast receiving antenna 500.
The receiving unit 61 receives and demodulates the broadcast signal received in. The ECM data separating unit 62 separates the ECM data from the demodulated signal. Reference numeral 63 denotes an IC card interface unit for exchanging signals of the separated ECM data between the television receiver 600 and the IC card 700.
Input to the IC card 700, which is a security module, via the card interface unit 63. The IC card 700 outputs the key required to decipher the ECM code and descramble the video / audio packet of the program or the commercial.

The key output from the IC card 700 is supplied to the descrambling unit 64 to descramble the video / audio packet of the received program or commercial.
The video / audio data thus obtained is supplied to the recording / reproducing unit 65 for recording / reproducing, decoded by the decoder / AV output unit 66, and output to the monitor 800.

The above operation control is performed from the control section 67 and the user interface section 68 for receiving an input from the user and for indicating the operation state. The control unit 67 is an ECM
Each time the ECM updated by the data separation unit 62 is taken in, the data is transferred to the IC card interface unit 6
3 as a command to the IC card 700.

FIG. 7 is a diagram showing a functional configuration example of the IC card 700. The interface unit 71 is a unit that receives a command sent from the television receiver 600 and sends a response to the command to the television receiver 600. FIG. 8 shows ISO / IEC 7816 T = 1,
An example of the format of the transmission protocol is shown in FIG.
FIG. 8B shows an example of a response from the IC card 700 to the CM command.

From the television receiver 600 to the IC card 700
When an ECM command is sent to, the ECM data decoding unit 7
2, the ECM data is decrypted, and then the scramble key analysis unit 73 extracts the descramble key.

Further, the control unit 74 analyzes the commercial descriptor in the ECM data by the commercial identification information analysis unit 75 and when it finds it, it records it in the commercial viewing history recording unit 76 as a viewing history and a response. In addition to the descramble key, information indicating that commercial broadcast has been detected is added and returned to the television receiver 600. Since the IC card 700 has excellent tamper resistance against unauthorized access to its internal data, the confirmation result can be recorded more safely.

Further, when the television receiver 600 obtains the information that the commercial broadcast is received from the response of the IC card 700, the broadcast signal is recorded in the recording / reproducing unit 65 of the television receiver 600 by using this as a trigger. . Thus, the actual broadcast content can be confirmed later by recording the commercial broadcast only during the detected period.

As a key for descrambling, the ECM is updated periodically (every 1 second) at a predetermined cycle, and I
Since it is sent to the C card 700, the ECM counter 77 detects that the commercial broadcasting is in progress E
By counting the commercials, it is possible to know how many seconds the commercial has actually been broadcast (whether the commercial has not been edited shortly).

By designating the time limit for commercial confirmation in the broadcast confirmation expiration date information section 78 of the IC card 700, the ECM current time analysis section 79 causes the ECM current time analysis section 79 to include the current time information and broadcast confirmation expiration date information included in the ECM. The expiration dates in the section 78 are compared, and if the expiration dates have passed,
No commercial confirmation processing is performed as a broadcast confirmation. As a result, it is possible to enhance the safety against unauthorized diversion.

According to this embodiment, the commercial identification information is sent encrypted in the key information,
Since the information on the encryption method of the key information is not disclosed to the public, it cannot be identified as it is whether it is the key information of the main program or the key information including the identification information of the commercial. Therefore, the commercial identification information from the broadcasting station is not used for any purpose other than the original purpose by a third party, and only the legitimate broadcast confirmation television receiver can perform commercial detection and broadcast confirmation.

Similarly, an ordinary television receiver having no commercial broadcast confirmation function also decrypts the key information including the commercial identification information, but ignores it because it does not know the commercial identification information. Since only the same operation as in the case of the key information of the main program is performed, it is not possible to determine from the behavior whether the main program is being broadcast or the commercial is being broadcast. From these things, it is possible to safely confirm the commercial broadcast.

The present invention is not limited to the above-described embodiment, and for example, by recording a broadcast program triggered by the detection of commercial identification information, only the actual commercial broadcast portion is recorded. It can be recorded efficiently and the contents can be efficiently confirmed later.

Further, the scramble key is updated at a predetermined cycle, and the key information is also updated and sent according to this, so counting the updated and sent key information during commercial broadcasting. You can find out how many seconds the commercial was broadcast.

Further, the expiration date information is compared with the current time, and only when the expiration date has not been reached, the commercial identification information in the received key information is detected. As a result, when the expiration date is reached, the commercial detection function of the television receiver does not work, so the safety against unauthorized diversion can be improved.

Furthermore, the expiration date information is compared with the current time to detect the presence or absence of commercial identification information only when the expiration date has not been reached, and when detected, both the commercial identification information and the key information are scrambled. Try to solve the main program and commercials. As a result, when the expiration date is reached, the function of commercial detection of the IC card is disabled, and the safety against unauthorized diversion can be improved.

[0039]

As described above, according to the present invention, the identification information peculiar to a commercial is prevented from being used by a general viewer during a commercial broadcast in skipping a commercial broadcast and the like. It will be possible for a third party to efficiently investigate and confirm commercial broadcasts.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of scramble broadcasting according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram for explaining the satellite broadcasting ground station 100 of FIG.

FIG. 3 is an explanatory diagram for explaining a data configuration example of a commercial descriptor.

FIG. 4 is an explanatory diagram illustrating an example of the configuration of an ECM.

FIG. 5 is an explanatory diagram for describing a configuration example of a transport stream of packetized commercials and program data.

6 is a system configuration diagram for explaining an example configuration of the television receiver of FIG.

7 is a configuration diagram for explaining an example configuration of the IC card of FIG.

FIG. 8 is an explanatory diagram for explaining an ECM command of an IC card and its response.

[Explanation of symbols]

111 ... Identification information 112 ... ECM data generator 113 ... ECM data encryption unit 114 ... SI / PSI data generator 115 ... Packet generator 116 ... Packet multiplexing unit 117 ... A / V data 118 ... A / V data 119 ... Packet generator 120 ... Modulation / transmission unit 121 ... Control unit

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // H04L 9/08 H04L 9/00 601B 9/16 643

Claims (10)

[Claims] 1. On the transmitter side, a means for scrambling the main program or commercial, a means for encrypting key information necessary to descramble the main program or commercial, and a commercial part of the key information. The corresponding key information includes means for adding identification information of the commercial to the key information in advance, and means for appropriately multiplexing and transmitting the key information to the main program and commercial program signals. Then, means for obtaining the encrypted key information from the signal transmitted by the transmitter, means for decrypting the obtained encrypted key information to obtain a key, and the key information Means for detecting the identification information of the commercial, a means for descrambling the main program or the commercial, and the identification information detecting means. Wherein when it is detected the commercial identification information, transmitting and receiving apparatus characterized by comprising by and means for recording the commercial identification information as a broadcast history commercials by. 2. The key information necessary for descrambling the main program or commercials in the transmitter is added with the current time information and encrypted, and the receiver identifies the commercial identification information in the key information in advance. The expiration date information of the process of detecting the key information is recorded, the expiration date information is compared with the current time added to the key information, and only when the expiration date is not reached, The transmitter / receiver according to claim 1, wherein identification information of the commercial in the commercial is detected. 3. The transmission / reception apparatus according to claim 1, wherein a means for obtaining the key and a means for detecting the identification information are provided in a security module that is detachable from the receiver body. . 4. The transmitting / receiving apparatus according to claim 1, wherein the commercial program is recorded in the recording unit when the identification information of the commercial is detected by the identification information detecting unit. 5. The receiver is provided with means for counting the number of times that the content of the key information is updated and the identification information of the commercial is detected by the identification information detecting means. Transceiver device. 6. A program main part or a commercial is scrambled, key information necessary for descrambling the scramble is encrypted, and identification information of the commercial is added in advance to the key information corresponding to the commercial to obtain the key. A receiving device for receiving a signal transmitted by appropriately multiplexing information on the main program and commercial program signals, and means for acquiring the encrypted key information, and decrypting the acquired encrypted key information. Means for obtaining a key, a means for detecting the commercial identification information in the key information, a means for descrambling the main program or the commercial, and the commercial identification information by the identification information detecting means If detected, a means for recording the commercial identification information as a commercial broadcast history. Receiving apparatus characterized by comprising in Bei. 7. A program main part or a commercial is scrambled, and current time information is added to the key information necessary for descrambling and the data is encrypted, and the key information corresponding to the commercial is previously identified by the identification information of the commercial. And a validity period information for detecting this, and a receiving device that receives the transmitted signal by appropriately multiplexing the key information with the program signal of the main program and commercial program signals, and decrypts the encrypted key information. Means for obtaining a key, means for detecting identification information of the commercial in the key information, means for obtaining the key and means for detecting the identification information, and the commercial in the key information in advance The expiration date of the process for detecting the identification information of the key information is recorded, and the expiration date information is compared with the current time sent in addition to the key information. , Only when the expiration date has not been reached, means for detecting the presence or absence of the commercial identification information by the commercial identification information detection means, and when the commercial identification information is detected, this information together with the key A receiver for outputting the scramble to a means for descrambling. 8. The receiving device according to claim 6, wherein the key obtaining unit and the identification information detecting unit are provided in a security module that is detachable from the receiver body. 9. The receiving apparatus according to claim 6, wherein the commercial program is recorded in the recording unit when the identification information of the commercial is detected by the identification information detecting unit. 10. The receiving apparatus according to claim 6, further comprising means for counting the number of times that the content of the key information is updated and the commercial identification information is detected by the identification information detecting means. .