JP2006074686A - Tuner module, digital broadcast receiver, and digital broadcasting program contents protecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tuner module, digital broadcast receiver, and digital broadcasting program contents protecting method in which a copyright is protected by preventing illegal copy and transfer of broadcasting program contents received from a digital broadcast. <P>SOLUTION: The digital broadcast receiver is comprised of a tuner module 11 and a personal computer 21. The tuner module 11 generates broadcasting program contents by tuning to and demodulating a received digital broadcasting signal and performing code error correction, encrypts the contents and transmits them to the personal computer 21. Furthermore, mutual authentication with the personal computer 21 is performed using an authentication parameter multiplexed on the digital broadcasting signal. By updating the authentication parameter, transmission of the broadcasting program contents is stopped by judging no establishment of the mutual authentication, illegal reception of the broadcasting program contents is excluded, and the protection of the copyright is attained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a tuner module, a digital broadcast receiving apparatus, and a digital broadcast program content protection method used by being connected to an electronic device.

In recent years, personal computers (hereinafter referred to as personal computers) have become advanced AV (Audio).
Visual) function, and by connecting a TV broadcast receiving tuner module to a personal computer, the broadcast program content can be displayed on the LCD display of the personal computer for viewing or recorded on the HDD. Has become commonplace. Also, TV broadcasting has shifted from analog broadcasting to digital broadcasting, and a tuner module used by connecting to a personal computer is also desired for digital broadcasting.

However, in digital broadcasting, broadcast program content is digitized, transmitted, and processed, so there is almost no deterioration in image quality and sound, it is easy to duplicate, and illegally copied and transferred to infringe copyright. There is a risk of being. Generally, a personal computer has a general-purpose interface such as USB 2.0 and a PCI bus that can be easily connected to external devices, and software can be freely selected and installed. It can be said that there is a high risk of unauthorized duplication and transfer.

Therefore, as a measure for protecting the copyright of the broadcast program content, when receiving the broadcast program content by connecting the tuner module to a general-purpose interface such as a personal computer, the program is recorded on the broadcast program content transmitted on the general-purpose interface and the HDD. It is required that the broadcast program content is encrypted or the digital broadcast receiving software installed in the personal computer has tamper resistance so as not to be tampered with (see, for example, Patent Document 1).

A configuration of a conventional digital broadcast receiving apparatus is shown in FIG. The digital broadcast receiving apparatus 100 includes a personal computer 120 and a tuner module 101 connected to the personal computer 120. A digital broadcast signal from the antenna 103 is input to the tuner unit 104. The tuner unit 104 performs channel selection, demodulation, and code error correction, generates a transport stream, and inputs the transport stream to the descramble processing unit 105. Descramble processing unit 1
05 cancels the scramble applied to the pay stream limited reception on the transport stream, and generates broadcast program content. This broadcast program content is stored in the encryption unit 10
6, the data is encrypted and then sent to the personal computer 120 via the PCI bus 121. In addition, the peripheral control unit 108 is provided with CAS (Conditional Access Sy
The encryption key is acquired from the IC card 110 of the (stem) system via the IC card I / F unit 109 and output to the encryption unit 106. The encryption unit 106 encrypts the broadcast program content using this encryption key.

The encrypted broadcast program content received by the personal computer 120 is decrypted by the encryption / decryption processing means 129, which is one of the digital broadcast reception control processing means 126, and MPEG2
Decoded by the decoding means 131. The decoded video data of the broadcast program content is output to the display controller 132, converted, and displayed on the LCD display 134. The audio data of the decoded broadcast program content is the sound controller 1
D / A conversion is performed at 35 and output, and the speaker 136 is sounded.
JP 2001-45432 A (page 7, FIG. 2)

However, in the conventional digital broadcast receiving apparatus, even tamper-resistant digital broadcast receiving software has a risk of being tampered with as long as the software operates on an open architecture such as a personal computer. If the encryption key, etc. in the digital broadcast receiving software is decrypted and used illegally, such as by copying broadcast program content or transferring it to the public line, the fact that the specific digital broadcast receiving software has been hacked or altered. Even if it was detected, there was a problem that there was no countermeasure such as immediately stopping the receiving operation of the broadcast program.

The present invention has been made to solve the above-mentioned problem. Parameters used for authentication between devices connected to a digital broadcast signal through an interface in advance are multiplexed, and based on the authentication parameters, Receiving digital broadcasts that are improperly used by the broadcast station immediately by performing mutual authentication between the tuner module and the PC and controlling the transmission of broadcast program content from the tuner module to the PC based on the authentication result The program reception of the device can be eliminated. For this purpose, a tuner module, a digital broadcast receiving apparatus, and a digital broadcast program content protection method for protecting the copyright of broadcast program content are provided.

In order to solve the above problems, a tuner module according to the present invention is a digital broadcast reception tuner module used by being connected to an electronic device, and a tuner unit that selects a received digital broadcast signal; and the tuner unit A demodulator for demodulating the digital broadcast signal selected in step 1 to generate a transport stream, and descrambling for descrambling broadcast program content for content protection or limited reception from the transport stream A processing unit, means for extracting authentication parameters multiplexed in the transport stream, means for mutual authentication with the electronic device using the authentication parameters, and output from the descramble processing unit Broadcast stream content of the transport stream An encryption unit; and an interface for transmitting the encrypted broadcast program content to the electronic device, and controlling transmission of the broadcast program content based on a result of mutual authentication with the electronic device. Features.

The digital broadcast receiving apparatus according to the present invention is a digital broadcast receiving apparatus having a configuration in which a tuner module that receives a digital broadcast signal and an electronic device are connected via an interface, and the tuner module is selected by a tuner unit. A demodulator that demodulates a digital broadcast signal to generate a transport stream, and a descramble processor that de-scrambles broadcast program content for content protection or limited reception from the transport stream; Means for extracting authentication parameters multiplexed in the transport stream, means for mutual authentication with the electronic device using the authentication parameters, and transport output from the descrambling processing unit・ Stream broadcast programs Means for encrypting content, and means for transmitting the encrypted broadcast program content to the electronic device via the interface, wherein the electronic device mutually authenticates with the tuner module, and the tuner The broadcast program output from the module for receiving the encrypted broadcast program content from the module via the interface, the means for releasing the encryption of the encrypted broadcast program content, and the means for releasing the encryption Means for decoding video and audio from the content, and means for outputting the output from the video and audio decoding means to a display device and a speaker; the tuner module and the electronic device perform mutual authentication; Based on the result of the mutual authentication, the tuner module can And controlling the transmission of broadcast program content.

Furthermore, the digital broadcast receiving apparatus according to the present invention is a digital broadcast receiving apparatus having a configuration in which a tuner module that receives a digital broadcast signal and an electronic device are connected via an interface, and the digital broadcast signal is selected, demodulated, and error-corrected. The reception of broadcast program content at the digital receiver is restricted or restricted by means for extracting multiplexed authentication parameters from the transport stream and reception control information multiplexed on the broadcast. Detecting means for detecting that it is scheduled to be performed, and means for outputting information that prompts the electronic device to update the installed digital broadcast receiving software based on the result of the detecting means. It is characterized by.

Furthermore, the broadcast program content protection method according to the present invention includes means for multiplexing authentication parameters on a digital broadcast signal transmitted from a broadcasting station, means for extracting authentication parameters multiplexed from the received digital broadcast signal, Means for performing mutual authentication between the tuner module and the electronic device using the authentication parameter; means for encrypting the received broadcast program content and transmitting the encrypted content to the electronic device; and In a digital broadcast program content protection method according to a digital broadcast system comprising control means for controlling transmission to a device, the tuner updates the authentication parameter periodically or as needed, so that the tuner The mutual authentication between the module and the electronic device is controlled, and the mutual authentication is not established Expediently, the tuner module is characterized by stopping the transmission to the electronic apparatus of the broadcast program content.

According to the present invention, it is possible to control establishment of mutual authentication between an electronic device and a tuner module connected thereto by updating an authentication parameter multiplexed by a broadcasting station on a digital broadcast signal, whereby program content It is possible to eliminate the program reception of the broadcast receiving apparatus that has been discovered to be used illegally, and the copyright of the broadcast program content can be protected.

  Examples of the present invention will be described below.

Embodiments of a tuner module, a digital broadcast receiving apparatus, and a digital broadcast program content protection method according to the present invention will be described below with reference to FIGS. The present invention is not limited to the following examples.

FIG. 1 is a block diagram according to an embodiment of the present invention. A digital broadcast receiving apparatus according to an embodiment of the present invention includes a personal computer (one embodiment of an electronic device described in claims) 21 and a tuner module 11 used by being connected to the personal computer 21. The tuner module 11 includes a tuner unit 13 for selecting a digital broadcast signal input from the antenna 12, a demodulation unit 14 for demodulating the signal selected by the tuner unit 13, and correcting the error code, and the demodulation unit 14 The descrambling processing unit 15 for descrambling the signal demodulated by the unit 14, the encryption processing unit 16 for encrypting the signal descrambled by the descrambling processing unit 15, and the encryption processing unit 16 Computer 2
1 is provided. In addition, EMM (Entitlement Management Message) including authentication parameters from digital broadcast signals
e, individual control information) A filtering unit 17 that extracts packets and the like, and an authentication processing control unit 18 that processes mutual authentication with the connected personal computer 21 are provided.

The personal computer 21 includes a CPU 28, main memory 27, host CPU bridge 29, I / O controller 24, HDD 25, keyboard 26, interface controller 22, and PC.
Configurations such as an I bus 27 and an AGP bus 42 are provided. In addition, a display controller 37 for displaying broadcast program content and the like on an LCD display (an embodiment of a display device described in claims), a VRAM 38 for storing display data, and a sound controller 40 for causing a speaker 41 to sound are provided. I have. Further, in accordance with the digital broadcast receiving software installed in the personal computer 21, the CPU 21 decrypts the encrypted signal received from the tuner module 11, and the MPEG2 decoding means 35 for decoding the decrypted signal. Digital broadcasting comprising mutual authentication processing means 36 for mutual authentication with the tuner module 11, EPG (broadcast program guide) processing means 33, tuner module control means 31, GUI (graphic user interface) processing means 32, etc. Reception control processing means 30 is provided.

Hereinafter, the operation of the present embodiment will be described in more detail with reference to FIG. The antenna 12 receives digital broadcast radio waves transmitted from a broadcast station or a broadcast satellite, and receives a tuner unit 13.
To send. The tuner unit 13 converts the input into an intermediate frequency, selects a channel to be viewed by the user, and sends the selected signal to the demodulation unit 14. The demodulator 14 performs A / D conversion on the signal, and performs QPSK (Quadrature Phase Shift Seii).
ng) Demodulate the signal modulated by the system, correct the code error that occurred in the transmission path, etc.
A transport stream compliant with the MPEG2 standard is generated and sent to the descrambling processing unit 15. If the descramble processing unit 15 is scrambled by a reception-restricted system that prevents unauthorized viewing of a pay broadcast program and allows only a legitimate user to receive the transport stream, Unscramble the stream. Note that descrambling is performed by CAS (Conditional Ac
Authenticate that the user is a legitimate user using an IC card of the cess System), create a descrambling key, and use that unlocking key to descramble the transport stream and receive pay broadcast programs And can be viewed.

The encryption processing unit 16 encrypts the descrambled transport stream and transmits it to the personal computer 21 via the general-purpose interface 19 (USB 2.0 in the embodiment). By encrypting the transport stream including the broadcast program content and then transmitting it to the interface 19, even if the data on the interface 19 is stolen, it is encrypted, so unauthorized viewing or copying Can be prevented.

The filtering unit 17 extracts the EMM packet multiplexed in the transport stream and sends it to the authentication processing control unit 18. The authentication processing control unit 18 acquires an authentication parameter from the EMM packet. Further, the authentication processing control unit 18 performs mutual authentication processing with the personal computer 21 using this authentication parameter, and shares an encryption key for encrypting broadcast program content to be transmitted. When mutual authentication is established, an encryption key is sent to the encryption processing unit, and transmission of the encrypted broadcast program content to the personal computer 21 is permitted.

On the other hand, if the mutual authentication is not established, the tuner module 11 stops transmitting the broadcast program content to the personal computer 21, and the personal computer 21 prompts the user to update the digital broadcast receiving software. Although detailed description is omitted, the authentication processing control unit 1
In FIG. 8, the entire tuner module 11 is also controlled.

Hereinafter, the operation of the personal computer 21 will be described. G indicates the channel to be viewed by the user
The tuner module control unit 31 received via the UI processing unit 32 requests the tuner module 11 to perform mutual authentication, channel selection, and reception of a digital broadcast program. The mutual authentication processing means 36 uses the digital broadcast reception software identification parameter specific to the corresponding version of the digital broadcast reception software to share mutual authentication and encryption key with the authentication processing control unit 18 of the tuner module 11. Do.

If mutual authentication is established, the encrypted broadcast program content is transferred to the interface 19,
It can be received via the interface controller 22 and the PCI bus 23. The encryption / decryption means 34 decrypts the encrypted broadcast program content and sends it to the MPEG2 decoding means 35. The MPEG2 decoding means 35 decompresses broadcast program content compressed based on the MPEG-2 standard into the original video data and audio data. The video data is sent to the display controller 37, and the audio data is sent to the sound controller 40 via the AGP bus 42. To send out. The display controller 37 temporarily stores the video data in the VRAM 38 and LC
It is displayed on the D display 39. The sound controller 40 D / A converts the audio data and causes the speaker 41 to sound. The EPG processing means 33 extracts broadcast program guide information from the broadcast program content and uses it for creating a program list, channel selection, recording reservation, and the like.

If mutual authentication is not established, the personal computer 21 cannot receive broadcast program content. Since the mutual authentication is not established and the digital broadcast cannot be viewed via the GUI processing means 30, the mutual authentication processing means 36 displays a message prompting the user to update the digital broadcast receiving software on the LCD display 39 to notify the user. .

Next, FIG. 2 shows an outline of data and information included in the digital broadcast signal. The digital broadcast signal includes an authentication parameter used for mutual authentication in addition to video data and audio data.
MM information and the like are multiplexed.

FIG. 3 shows the format of the transport stream. The transport stream is a continuous signal of 188-byte transport stream packets (hereinafter referred to as TS packets). A TS packet has a 4-byte (32-bit) header and 18
It consists of a 4-byte payload, and PID (Packet ID) in the header
In 13 bits, what TS packet this TS packet is (video data, audio data,
EMM information). Based on this PID, the digital receiving apparatus 10 filters necessary TS packets and processes the information of the payload.

Hereinafter, an acquisition procedure of authentication parameters used for mutual authentication will be described with reference to the flowchart of FIG. The tuner module filters packets with a PID value of 0x01 from the transport stream (step 401), and CAT (Condit)
(ional access table) Takes out a session packet (step 4).
02). CA (Conditional Access) from CAT session data
The PID of the EMM packet described in the descriptor format is taken out (Step 40).
3).

The tuner module uses the PID value of this EMM packet to
Filtering from the stream (step 404), taking out the EMM packet (step 405), and obtaining EMM session data (step 405). In the EMM session data, an ID assigned for each manufacturer, model, and version of the tuner module (receiver) and its authentication parameter information are incorporated as a set. The tuner module extracts authentication parameter information corresponding to the ID of the tuner module from the EMM session data (step 407). The authentication parameter information is preliminarily encrypted with a cipher that can be decrypted only by the tuner module that matches the ID. The tuner module decrypts the encrypted authentication parameter information,
An authentication parameter is acquired (step 408). In this embodiment, the authentication parameter is described as being included in the EMM packet. However, SI (Service Information) is used.
on) may be included in the information.

Next, referring to the flowchart shown in FIG. 5, the tuner module 1 according to the present embodiment.
A procedure for mutual authentication and encryption key sharing between 1 and the personal computer 21 will be described. The tuner module 11 generates a random number (step 501), and creates an authentication session key A that is a basis for mutual authentication processing and creation of an encryption key for broadcast program content (step 502). Further, according to the procedure described with reference to FIG. 4, an authentication parameter is obtained (step 503), and using this authentication parameter, a tuner module identification parameter (for claims) held by the tuner module 11 for mutual authentication is used. One example of the described first authentication parameter is updated (step 504). Then, the authentication session key A is used as data, and the tuner module identification parameter is used as a key (step 505). The encrypted data is transmitted to the personal computer 21.

On the other hand, the personal computer 21 receives the encrypted data received from the tuner module 11 in the digital broadcast reception software identification parameter (second authentication parameter described in claims) Example) (step 551) is decrypted using the key (step 552), and an authentication session key B is created (step 552)
Step 553). Through the above procedure, both the tuner module 11 and the personal computer 21 create authentication session keys A and B. Then, mutual authentication is performed by the following procedure to determine whether or not both authentication session keys are correct (same key).

The tuner module 11 generates a random number (step 506), creates authentication data A for use in mutual authentication processing (step 507), transmits the authentication data A to the personal computer 21, and transmits the authentication data A to the personal computer 21. Encryption is performed using the authentication session key A as a key (step 509). On the other hand, the personal computer 21 generates a random number (step 554), creates authentication data B used for the mutual authentication process (step 555), transmits the authentication data B to the tuner module 11, and the authentication data. B is encrypted using the authentication session key B as a key (step 556).

The tuner module 11 encrypts the authentication data B received from the personal computer 21 using the authentication session key A as a key (step 508), and returns the encrypted authentication data B to the personal computer 21. On the other hand, the personal computer 21 encrypts the authentication data A received from the tuner module 11 using the authentication session key B as a key (step 557), and returns the encrypted authentication data A to the tuner module 11. The tuner module 11 compares the authentication data A encrypted with its own authentication session key A with the authentication data A encrypted by the personal computer 21 with the authentication session key B (step 510).

On the other hand, the personal computer 21 has authentication data B encrypted with its own authentication session key B, and
The tuner module compares the authentication data B encrypted with the authentication session key A (step 558). The logical product of coincidence (Yes) of the comparison results of the two is obtained (step 515).
) If both comparison results match, it is determined that the authentication session keys A and B are the same, and mutual authentication is established (step 516). On the other hand, if at least one of the comparison results does not match, it is determined that there is a difference between the authentication session keys A and B, and authentication is not established.

When mutual authentication is established, the tuner module 11 performs an exclusive OR operation between the authentication data B encrypted using the authentication session key A and the authentication data A encrypted using the authentication session key A. (Step 511), the output data is encrypted using the authentication session key A as a key (step 512), and an encryption session key A used to encrypt the broadcast program content to be transmitted is created (step 513). On the other hand, the personal computer 21 performs an exclusive OR of the authentication data A encrypted using the authentication session key B and the authentication data B encrypted using the authentication session key B (step 559). The output data is encrypted using the authentication session key B as a key (step 560), and an encrypted session key B used to decrypt the encrypted broadcast program content is created (step 561).

Hereinafter, with reference to the flowchart of FIG. 6, factors, work procedures, and methods for updating the digital broadcast receiving software will be described together. The factors that cause the update of the digital broadcast reception software are 1) regular updates to prevent tampering of the digital broadcast reception software, and 2) the improved version of the digital broadcast reception software with improved tamper resistance. 3) When tampering with digital broadcast receiving software is detected, there is an urgent update to a tamper proof version (step 601).

In addition, preparations for updating the software manufacturer of the digital broadcast receiving software and the broadcasting station that transmits the broadcast program content are as follows: 1) Preparation of the update version of the digital broadcast receiving software and preparation for release, 2) Notification of the update execution to the user (
(Email, homepage, etc.) 3) Mutual authentication failure due to update of authentication parameters multiplexed on digital broadcast signal, prompting user to update, etc. (step 60)
2).

Furthermore, the update methods are as follows: 1) When digital broadcast reception software is started up, automatic confirmation via the Internet, automatic update, 2) download from software manufacturer's website, update, 3) update by e-mail, 4) mailing Update by media, 5) Update by digital broadcast download service, etc. (step 603). The user can either
By updating the digital broadcast receiving software installed in the personal computer 21, the broadcast program content can be continuously viewed.

According to the embodiment of the present invention described above, when tampering with the digital broadcast receiving software is detected, the broadcast parameter content is not transmitted from the tuner module to the personal computer by updating the authentication parameter and disabling mutual authentication. Thus, the viewing of the broadcast program content is restricted, and the copyright can be protected by preventing unauthorized use such as unauthorized duplication of the broadcast program content or transfer to the public line. Further, by periodically updating the authentication parameter, it is possible to prevent unauthorized use due to unauthorized tampering with the digital broadcast receiving software, thereby protecting the copyright. Furthermore, copyright protection can be further enhanced by updating the digital broadcast receiving software to an improved version with higher tamper resistance. Furthermore, the broadcast program content can be continuously viewed or resumed by updating to the digital broadcast reception software.

The block diagram of the digital broadcast receiver in the Example of this invention. The schematic diagram of the digital broadcast signal in the Example of this invention. The format figure of the transport stream in the Example of this invention. The flowchart which shows the procedure of the authentication parameter acquisition in the Example of this invention. The flowchart which shows the procedure of the mutual authentication in the Example of this invention. The flowchart which shows the update process of the digital broadcast reception software in the Example of this invention. The block diagram which shows the structure of the conventional digital broadcast receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Digital broadcast receiver 11 Tuner module 12 Antenna 13 Tuner part 14 Demodulator 15 Descrambler 16 Encryption processing part 17 Filtering part 18 Authentication process control part 19 Interface 21 Personal computer 22 Interface controller 23 PCI bus 24 I / O controller 25 HDD
26 Keyboard 27 Main memory 28 CPU
29 Host PCI bridge 30 Digital broadcast reception control processing means 31 Tuner module control means 32 GUI processing means 33 EPG processing means 34 Encryption / decryption means 35 MPEG2 decoding means 36 Mutual authentication means 37 Display controller 38 VRAM
39 LCD display 40 Sound controller 41 Speaker 42 AGP bus

Claims (12)

A digital broadcast receiving tuner module used in connection with an electronic device,
A tuner unit that tunes the received digital broadcast signal;
A demodulator that demodulates the digital broadcast signal selected by the tuner unit to generate a transport stream;
A descrambling processing unit for descrambling broadcast program content for content protection or limited reception from the transport stream;
Means for extracting authentication parameters multiplexed in the transport stream;
Means for mutual authentication with the electronic device using the authentication parameter;
Means for encrypting the broadcast program content of the transport stream output from the descrambling processing unit;
An interface for transmitting the encrypted broadcast program content to the electronic device,
A tuner module that controls transmission of the broadcast program content based on a result of mutual authentication with the electronic device. In a digital broadcast receiving apparatus having a configuration in which a tuner module that receives a digital broadcast signal and an electronic device are connected via an interface,
The tuner module includes a demodulator that demodulates a digital broadcast signal selected by the tuner unit and generates a transport stream;
A descrambling processing unit for descrambling broadcast program content for content protection or limited reception from the transport stream;
Means for extracting authentication parameters multiplexed in the transport stream;
Means for mutual authentication with the electronic device using the authentication parameter;
Means for encrypting the broadcast program content of the transport stream output from the descrambling processing unit;
Means for transmitting the encrypted broadcast program content to the electronic device via the interface;
The electronic device includes means for mutual authentication with the tuner module;
Means for receiving the encrypted broadcast program content from the tuner module via the interface;
Means for decrypting the encrypted broadcast program content;
Means for decoding video and audio from broadcast program content output from the means for releasing the encryption;
Means for outputting the output from the means for decoding the video and audio to a display device and a speaker;
The tuner module and the electronic device perform mutual authentication, and control transmission of the broadcast program content from the tuner module to the electronic device based on a result of the mutual authentication. . In mutual authentication performed between the tuner module and the electronic device,
3. The digital device according to claim 2, wherein the tuner module uses a first authentication parameter generated from the authentication parameter, and the electronic device uses a second authentication parameter held in advance. Broadcast receiving device. In the mutual authentication procedure between the tuner module and the electronic device, the encryption key of the broadcast program content transmitted to the interface is shared, and the broadcast program content is encrypted using the encryption key. The digital broadcast receiver according to claim 2. When the authentication parameter multiplexed in the transport stream is updated, the tuner module updates the first authentication parameter, and uses the first authentication parameter to exchange data with the electronic device. The transmission of the broadcast program content through the interface is stopped and the viewing of the broadcast program content from the electronic device is restricted when the authentication is not established as a result of the authentication. 3. The digital broadcast receiving apparatus according to 3. The electronic device comprises means for outputting information prompting an update of the digital broadcast receiving software from the display device and a speaker,
3. The digital broadcast receiving apparatus according to claim 2, wherein if the authentication is not successful as a result of the mutual authentication, the electronic device outputs information prompting to update the digital broadcast receiving software. In a digital broadcast receiving apparatus configured to connect a tuner module that receives a digital broadcast signal and an electronic device via an interface,
Means for extracting multiplexed authentication parameters from a transport stream obtained by tuning, demodulating, and error correcting the digital broadcast signal;
Detecting means for detecting that reception of broadcast program content in the digital reception device is restricted or scheduled to be restricted from reception control information multiplexed in broadcast;
Means for outputting information that prompts the electronic device to update the installed digital broadcast receiving software according to the result of the detection means;
A digital broadcast receiver characterized by comprising: By detecting parameters in the common control information or individual control information multiplexed in the transport stream, it is detected that transmission of broadcast program content has been stopped or is scheduled to be stopped. The digital broadcast receiver according to claim 7. Means for multiplexing authentication parameters in a digital broadcast signal transmitted from a broadcast station;
Means for extracting multiplexed authentication parameters from the received digital broadcast signal;
Means for performing mutual authentication between the tuner module and the electronic device using the authentication parameter;
Means for encrypting the received broadcast program content and transmitting it to the electronic device;
In a digital broadcast program content protection method according to a digital broadcast system comprising a control means for controlling transmission to the electronic device according to the result of the mutual authentication,
The broadcast station updates the authentication parameter periodically or as necessary to control establishment of mutual authentication between the tuner module and the electronic device,
The digital broadcast program content protection method, wherein the tuner module stops transmission of the broadcast program content to the electronic device when the mutual authentication is not established. Comprising means for outputting information prompting an update of the digital broadcast receiving software installed in the electronic device,
If the mutual authentication is not established, update to the digital broadcast receiving software with higher tamper resistance corresponding to the updated authentication parameter according to the instruction of the means for outputting information prompting the update of the digital broadcast receiving software. The digital broadcast program content protection method according to claim 9, wherein the mutual authentication is established. When the mutual authentication is established, the authentication parameter is used to generate and share an encryption key between the tuner module and the electronic device,
The tuner module encrypts the received broadcast program content using the encryption key and transmits it to the electronic device,
The broadcast program content protection method according to claim 9, wherein the electronic device decrypts the broadcast program content using the encryption key. In the common control information or individual control information to be multiplexed with the digital broadcast signal to be transmitted, information that makes mutual authentication unsuccessful in the digital broadcast receiving device, or information that is scheduled to fail mutual authentication, is added,
In the mutual authentication procedure, the tuner module transmits information on the viewing restriction to the electronic device.
10. The digital broadcast according to claim 9, wherein the electronic device outputs information that prompts an update of digital broadcast reception software installed in the electronic device when the information on the viewing restriction is received. Program content protection method.

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