KR101240659B1 - Cas system and method for digital broadcating receiver - Google Patents

Abstract

The present invention encrypts an EMM request message for an unlicensed service with a public key of a corresponding terminal device and transmits an encrypted EMM request message. Disclosed is a system and method for limiting reception of a digital broadcast receiver. The reception restriction system of the digital broadcasting receiver of the present invention compares the viewing qualification information of the ECM received through the service selected by the service subscriber with the viewing qualification information of the EMM supplied from the reception restriction server, and as a result of the comparison, the selected service is denied. In the case of a service, a purchase request message is generated and displayed on the screen, and when a purchase request is made through the displayed purchase request message, the authentication information is performed after the authentication is performed after the authentication is completed through authentication of the entered service subscriber personal information ( EMM) The request message is transmitted to the information transmission session, and after receiving the EMM request message, processing the charge for the requested service, encrypting the EMM request message for the requested service with the public key of the corresponding terminal device, and then requesting the encrypted EMM. Includes a configuration to forward messages to the throttling server .

Digital Broadcast Receiver, IPTV, Limited Receiver, CAS, EMM, ECM

Description

Restriction system and method of digital broadcasting receiver {CAS SYSTEM AND METHOD FOR DIGITAL BROADCATING RECEIVER}

The present invention is to further improve the security of the digital broadcast receiver, and more particularly, the EMM request message generated in response to a service request of a service subscriber for an unlicensed service as a public key of the corresponding terminal device. A digital broadcast receiver that further enhances the security of the EMM request message and the EMM information about the requested service generated to promptly respond to various service provision needs of service subscribers by transmitting encrypted EMM request message. The present invention relates to a system and method for reception restriction of a digital broadcast receiver.

In order to watch a paid service of a general digital broadcasting receiver, a reception restriction system is inserted into a terminal device, and for a licensed terminal device, a cable broadcaster may request an Emergency Alert System (EAS), an interactive program guide, or an Impulse Pay Per IPPV. View, Video On Demand, and Interactive services can be provided.

Recently, as the interactive service is enabled, data broadcasting service is available, and as a result, various services such as home shopping, home banking, mail transmission, interactive advertisement, and online game are expected to expand further.

Therefore, broadcasters are required to make an effort to further improve the security of the limited reception system that guarantees fraud prevention of purchase behavior.

In the conventional conditional access system, the entitlement management message (EMM: Entitlement Management Message: EMM) that manages the subscriber's entitlement, and the entitlement control message (ECM: Entitlement Control Message: ECM) for controlling the subscriber's entitlement ) Is generated and transmitted to the subscriber terminal device.

The reception restriction system provides EMM information and ECM information generated through an IP address assigned through DHCP, and the EMM information and ECM information transmitted to a corresponding terminal device of a subscriber distinguish EMM information and ECM information of a restricted reception system. The message is interpreted as it passes through the filter.

In this case, when there are various service requests such as subscription or termination of a broadcast service performed by a service subscriber or purchase or cancellation of a product, the requested service-related EMM request message is provided to a reception restriction server at a dynamic IP address. The terminal cannot transmit a real-time broadcast service subscription or termination request to such a dynamic IP address and transmits the generated EMM information and ECM information in a multicasting manner.

In addition, since the EMM request message generated by the corresponding terminal device and the EMM information generated by the reception restriction server according to the EMM request message can be received by the duplicated terminal device in relation to the service requested by the subscriber, according to various service requirements The security of the generated EMM request message and EMM information was very weak.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to view an unlicensed service after performing authentication of a corresponding terminal device using personal information of a service subscriber when a purchase request for an unlicensed service is requested. Encrypts the credential information (EMM) request message to generate a password EMM request message, then forwards the generated password EMM request message to the Restriction Server through the information transfer session, and sends the information of the EMM Request message that was requested for purchase from the Restriction Server. By providing EMM information of the service requested to purchase in the same session as the session, and encrypting the generated EMM information and transmitting the encrypted EMM information to the terminal device, viewing of the unlicensed service Encrypt EMM request message with public key of the corresponding terminal device to request EMM It is to transmit the message.

The present invention has been made in view of the above circumstances, and another object of the present invention is to provide an unlicensed service after performing authentication of a corresponding terminal device using personal information of a service subscriber when a purchase request for an unlicensed service is requested. Encrypts the EMM request message for a password, generates a password EMM request message, and then passes the generated password EMM request message to the reception restriction server through an information transmission session. In the same session as the information transmission session, the EMM information of the service requested to be generated is generated, and the generated EMM information is encrypted to provide the reception restriction method of the digital broadcasting receiver for transmitting the encrypted EMM information to the terminal device. Encrypts the EMM request message with the public key of the corresponding terminal device to request the encryption EMM. It is in sending a message.

The reception restriction system of the digital broadcasting receiver according to the first aspect of the present invention for achieving the above object generates a purchase request message corresponding to a service requested by a service subscriber, and generates a purchase request message for the unlicensed service through the purchase request message. When a purchase request is generated, an EMM request message for an unlicensed service requested for purchase is generated, and then an encrypted EMM request message is generated with a public key of the corresponding terminal device to generate a password EMM request message, and the generated encrypted EMM request message. A terminal device for transmitting the information through an information transmission session; And obtaining the EMM request message by decrypting the received EMM request message with the private key corresponding to the public key of the corresponding terminal device, generating the EMM information for the requested service according to the obtained EMM request message, and then generating the corresponding EMM information. And a reception restriction server for generating encrypted EMM information by encrypting with a public key of the terminal device and transmitting the generated encrypted EMM information to the terminal device.

A terminal apparatus of a digital broadcasting receiver according to a second aspect of the present invention for achieving the above object is to generate a purchase request message requested by a service subscriber and to request a purchase of an unlicensed service through the purchase request message. A management unit for generating an EMM request message for an unlicensed service requested for purchase after executing authentication of a service subscriber using personal information of the service subscriber, and using the generated EMM request message of the management unit as a public key of the corresponding terminal device; A security unit for encrypting and generating a password EMM request message, and then transmitting the generated password EMM request message through an information transmission session; And a control unit which transmits a password EMM request message for a purchase requested service provided from the security unit to a reception restriction server after paying a fee for a service requested to be purchased according to an authentication result of the management unit through a charging unit.

Preferably, the management unit displays the purchase request message and displays the subscriber's personal information input message upon the purchase request message by the subscriber according to the displayed purchase request message, and inputs the subscriber's personal information based on the displayed personal information input message. Can be.

Preferably, the management unit, by the EMM information based on the ECM information received through the selected service among a plurality of services and the purchase request for requesting to provide a corresponding service when the corresponding service subscriber is not provided by the EMM information supplied from the reception restriction server. A purchase request message generating module generating a message; A data processing module for receiving and displaying the purchase request message and inputting personal information of a service subscriber when a subscriber requests to provide a corresponding service according to the displayed purchase request message; A personal information authentication module for performing authentication on a service subscriber using the personal information of the data processing module; And an EMM request message generation module for generating an EMM request message for a service requested for purchase after authentication of a subscriber through the personal information authentication module.

Preferably, the purchase request message may include one or more of a non-receipt message, purchase product information for the unlicensed service, a prepaid right for the unlicensed service, a fare information for the unlicensed service, and purchase selection information.

Preferably, the data processing module may display a purchase request message provided from the purchase request message generation module of the management unit as a pop-up window, and when a purchase request for the unlicensed service is requested through the purchase selection information of the displayed purchase request message, The personal information input message may be generated and displayed on the screen, and the personal information input by the service subscriber may be transmitted to the management unit through the personal information input message.

Preferably, the security unit generates an encrypted EMM request message by encrypting the EMM request message provided through the EMM request message of the management unit with a public key of the corresponding terminal device, and transmits the generated EMM request message encryption module. It may include.

Preferably, the security unit receives the encrypted EMM information supplied from the EMM information encryption module of the reception restriction server through the control unit and decrypts the encrypted EMM information with the private key corresponding to the public key of the corresponding terminal device to obtain the EMM information. It may further include a decoding module.

Preferably, the data processing module of the management unit may provide a corresponding service based on the EMM information of the security unit.

In order to achieve the above object, the reception restriction server of the digital broadcasting receiver according to the third aspect of the present invention obtains an EMM request message by decrypting an encrypted EMM request message supplied from a terminal device with an encryption key corresponding to the public key of the corresponding terminal device. An EMM request message decoding module; An EMM information generation module for generating EMM information corresponding to the EMM request message; And an EMM information encryption module for generating encrypted EMM information by encrypting the generated EMM information with a public key of the corresponding terminal device and transmitting the generated encrypted EMM information to the corresponding terminal device.

In accordance with a fourth aspect of the present invention, there is provided a method of limiting reception of a digital broadcast receiver, wherein a purchase request message is generated and displayed on an on-screen screen when a service selected by a service subscriber is an unlicensed service. Display step; When the purchase request for the non-licensed service is performed together with the service subscriber personal information through the purchase request message on the screen, after generating authentication for the personal information, an EMM request message for the requested service is generated. Generating an EMM request message delivered to the transport session; An EMM request message encryption step of encrypting the generated EMM request message with a public key of a corresponding terminal device to generate an encrypted EMM request message and then transmitting the generated encrypted EMM request message to an information transmission session; And receiving an encrypted EMM request message and transferring the encrypted EMM request message for the requested purchase service to a reception restriction server after the billing process for the requested service is received.

Preferably, the method, the service received the purchase request on the basis of the obtained EMM request message after obtaining the EMM request message by decrypting the private key corresponding to the public key of the terminal device in the reception restriction server receiving the encrypted EMM request message Generating an EMM information for the EMM; An EMM encryption step of encrypting the generated EMM information with a public key of the corresponding terminal device to generate encrypted EMM information and then providing the generated encrypted EMM information to the corresponding terminal device; And a data receiving step of decrypting the encrypted EMM information received by the corresponding terminal device into a private key corresponding to the corresponding public key to obtain the EMM information and then providing a service requested for purchase with the obtained EMM information.

Preferably, the purchase request message may include one or more of a non-receipt message, purchase product information for the unlicensed service, a prepaid right for the unlicensed service, fee information for the unlicensed service, and purchase selection information.

Preferably, the displaying of the purchase request message may include displaying a purchase request message provided from the management unit in a pop-up window, and inputting personal information of a service subscriber when a purchase request for an unlicensed service is requested through purchase selection information among the displayed purchase request messages. May be generated and displayed on the screen, and the personal information input by the service subscriber through the personal information input message may be transmitted to the management unit.

Therefore, according to the reception restriction system and method of the digital broadcasting receiver of the present invention, when the service selected by the service subscriber is an unlicensed service, a purchase request message is generated and displayed on the on-screen, and the purchase request is made through the displayed purchase request message. When the authentication is performed through the inputted service subscriber personal information and the authentication is completed, the EMM request message for the selected unlicensed service is encrypted with the public key of the corresponding terminal device, and the encrypted EMM request message is transmitted. After receiving a charge and processing the charge for the service requested for purchase, the EMM request message for the service requested for purchase is transmitted to the reception restriction server, and the reception restriction server receiving the cipher EMM request message corresponds to the public key of the corresponding terminal device. EMM decrypts cryptographic EMM request message with private key After acquiring the request message, the EMM information for the requested service is generated, the EMM information generated by the public key of the corresponding terminal device is encrypted, the cryptographic EMM information is generated, and then provided to the corresponding terminal device to provide the corresponding service. It is possible to further improve the security of the EMM request message and the EMM information generated according to the EMM request message corresponding to the provided service, and thus to further improve the quality of service for the digital broadcasting reception system that provides the paid additional service. It is.

Hereinafter, a reception limiting system and method of a digital broadcasting receiver according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a system for limiting reception of a digital broadcast receiver according to an exemplary embodiment of the present invention, FIG. 2 is a diagram illustrating a configuration of a terminal device illustrated in FIG. 1, and FIG. 3 is FIG. 2. Fig. Shows the configuration of the management unit shown in detail. 4 is a detailed view showing the configuration of the security unit shown in FIG. 2, and FIG. 5 is a detailed view showing the configuration of the reception restriction server shown in FIG. 6 is a view for explaining a reception restriction process of the digital broadcast receiver through communication between the terminal apparatus and the reception restriction server shown in FIG.

As shown in FIG. 1, the reception restriction system of the digital broadcasting receiver according to the present invention generates a purchase request message for an unlicensed service and displays it on the screen when the unlicensed service is selected by a service subscriber. Generate and encrypt an EMM request message requesting the creation of an EMM message for the selected service purchased through the purchase request message on the screen, and provide the encrypted EMM request message to the reception restriction server through the information transmission session. Receiving the EMM request message is provided to receive and encrypt the EMM information corresponding to the service requested to purchase in the receiving restriction server and to provide the encrypted EMM information to the terminal device, such a system, the terminal device 100 and receiving Includes a restriction server 300.

Here, as shown in FIG. 2, the terminal device 100 generates a purchase request message when the service selected by the service subscriber is unlicensed, and provides a service subscriber upon purchase request for the unlicensed service through the purchase request message. The management unit 110 generates an EMM request message for the unlicensed service after performing authentication for the service subscriber using personal information of the service subscriber, and generates and generates an encrypted EMM request message by encrypting the EMM request message. Security unit 130 for transmitting the encrypted password EMM request message, and the password EMM request message provided from the security unit 130 after paying the charge for the unlicensed service of the security unit 130 through the charging unit (not shown) It includes a control unit 150 for transmitting the reception restriction server 300.

In addition, the management unit 110 compares the viewing qualification information of the EMM supplied from the reception restriction server 300 with the viewing qualification information of the ECM supplied through the selected service, and determines whether the service is unlicensed according to the comparison result.

Here, as shown in FIG. 3, the management unit 110 displays the purchase request message and displays the personal information input message of the subscriber when the purchase request message is made by the subscriber according to the displayed purchase request message and inputs the displayed personal information. The personal information of the subscriber is provided based on the message.

That is, the management unit 110 compares the viewing qualification information of the ECM supplied from the selected service with the viewing qualification information of the EMM supplied from the reception restriction server 300 to determine whether the service is an unlicensed service, and purchases the non-licensed service. Purchase request message generation module 111 for generating a request message, and a data processing module for receiving and displaying the purchase request message and input personal information of a service subscriber upon request for provision of the corresponding service by the subscriber according to the displayed purchase request message. 113, a personal information authentication module 115 for authenticating a service subscriber using the personal information of the data processing module, and the viewer qualification information on the service requested for purchase after the subscriber authentication through the personal information authentication module; (EMM) request message generating module 117 for generating a request message.

Here, the purchase request message may include at least one of a service non-provision message, purchase product information for the unlicensed service, a prepaid right for the unlicensed service, fee information for the unlicensed service, and purchase selection information.

Here, the data processing module 113 displays a purchase request message provided from the management unit as a pop-up window, and inputs personal information of a service subscriber when a purchase request for an unlicensed service is requested through purchase selection information among the displayed purchase request messages. And generate the personal information displayed on the screen, and transmit the personal information input by the service subscriber to the personal information authentication module 115 through the personal information input message.

That is, the data processing module 130 may not receive a message provided from the transmission module 117 of the management unit 110, purchase goods information for the unlicensed service, a prepaid right for the unlicensed service, and a fee for the unlicensed service. Displays a purchase request message including at least one of information, and purchase selection information as a pop-up window, and generates and displays a personal information input message of a service subscriber when a purchase request for an unlicensed service is requested through the purchase selection information. The personal information input by the service subscriber through the personal information input message is transmitted to the personal information authentication module 115.

In addition, as shown in FIG. 4, the security unit 130 encrypts the EMM request message of the management unit 110 with the public key of the corresponding terminal device to generate an encrypted EMM request message, and then generates the encrypted EMM request message. EMM request message encryption module 131 for transmitting through the transmission session, and receives the password EMM information for the service requested by the service subscriber provided from the reception restriction server 300 and receives the received password EMM information And an EMM information decoding module 133 which obtains EMM information by decoding the private key corresponding to the public key of the corresponding terminal device.

Meanwhile, the controller 150 receives the received password EMM request message and provides the password EMM request message to the reception restriction server 300 after settling the fee for the unlicensed service requested for purchase through a billing unit (not shown). do.

As shown in FIG. 5, the reception restriction server 300 decrypts the received encrypted EMM request message with an encryption key corresponding to the public key of the corresponding terminal device to obtain an EMM request message. ), An EMM information generation module 313 for generating EMM information corresponding to the EMM request message, and an encrypted EMM information generated after generating the encrypted EMM information by encrypting the generated EMM information with a public key of a corresponding terminal device. EMM information encryption module 315 for transmitting to the terminal device.

That is, the reception restriction server 300 receives the encrypted EMM request message and decrypts it with a private key corresponding to the public key of the corresponding terminal device to obtain an EMM request message and for the unlicensed service selected as the EMM request message. The EMM information is generated and the generated EMM information is encrypted using the public key of the corresponding terminal device to provide an encrypted EMM request message to the security unit 130 through the control unit 150.

On the other hand, the security unit 130 decrypts the encrypted EMM information with the private key corresponding to the public key of the corresponding terminal device through the EMM information decryption module 133 to obtain the EMM information and the obtained EMM information to the management unit 110. The management unit 110 provides a corresponding service requested to be purchased based on the received EMM information through the data processing module 113.

In an embodiment of the present invention, the purchase of an unlicensed service has been described as an example, but all services that can be selected by a service subscriber, such as canceling and canceling a purchase of an authorized service, or canceling a purchase of a product provided through the service, are described. Applicability will be obvious to those skilled in the art.

An operation process of the digital broadcast reception method will be described with reference to FIG. 6.

First, the management unit 110 of the terminal device 100 may determine the viewing qualification information of the ECM received through the service selected by the service subscriber and the viewing qualification information of the EMM supplied from the reception restriction server 300 through step 501. The service selected by the service subscriber according to the comparison result is determined to be an unlicensed service. Then, the management unit 110 generates a purchase request message when the non-licensed service is selected by the service subscriber, and then displays the purchase request message generated through the step 505 on the screen.

In the step 505, the purchase request message displayed in the pop-up window may be one or more of an unreceived message, purchase product information for the unlicensed service, prepaid rights for the unlicensed service, fee information for the unlicensed service, and purchase selection information. to be.

In addition, the management unit 110 of the terminal device 100 generates a personal information input message requesting the personal information input when the service subscriber selects the unlicensed service selected through the purchase selection information in step 507. After that, the generated personal information message is displayed on the screen.

After that, the management unit 110 of the step 100 executes authentication based on the personal information input from the service subscriber through the step 509 and generates the EMM information on the service requested for purchase after the authentication of the personal information is completed. After generating an EMM request message requesting the transmission to the security unit 130.

The security unit 130 encrypts the EMM request message received in step 511 with the public key of the corresponding terminal device to generate a cryptographic EMM request message, and generates the encrypted EMM request message together with the charge information of the corresponding service. 150).

The charge of the corresponding service is charged through step 513 of the controller 150 and then proceeds to step 515, and the encrypted EMM request message received in step 515 is sent to the reception restriction server 300. Is sent.

In addition, the reception restriction server 300 decrypts the encrypted EMM request message with the private key corresponding to the public key of the corresponding terminal device in step 517 to obtain an EMM request message, and then, the EMM obtained in step 519. The EMM information corresponding to the corresponding service is generated based on the request message, and the generated EMM information is encrypted with the public key of the corresponding terminal device through step 521 to generate encrypted EMM information, and the generated encrypted EMM information is stored in the security unit 130. Is provided.

The security unit 130 decrypts the encrypted EMM information received through step 523 with a private key corresponding to the public key of the corresponding terminal device, obtains the EMM information, and then supplies the obtained EMM information to the management unit 110. .

Accordingly, the management unit 110 provides a corresponding service requested to purchase based on the received EMM information.

If the service selected by the service subscriber in the terminal device is an unlicensed service, a purchase request message is generated and displayed on the screen, a purchase request message is displayed on the on-screen, and a purchase request is input through the displayed purchase request message. After authentication is performed through service subscriber personal information, after authentication is completed, the EMM request message for the selected unlicensed service is encrypted, and then the password EMM request message is transmitted to the reception restriction server as an information transmission session. Decrypts the encrypted EMM request message with a private key corresponding to the public key of the corresponding terminal device, obtains an EMM request message, generates and encrypts EMM information for the corresponding service based on the obtained EMM request message, and then encrypts the encrypted EMM information. As you provide these services by supplying them to the device, Commercially available digital broadcast receiver that can further improve the security of the EMM request message corresponding to the requested service and the EMM information generated according to the EMM request message at the reception restriction server to further improve the quality of service for the paid additional service. Not only is there a good chance of doing business, but it can be done clearly and realistically.

1 is a block diagram illustrating a reception restriction system of a digital broadcast receiver according to an exemplary embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a terminal device shown in FIG. 1.

3 is a diagram illustrating a configuration of the management unit illustrated in FIG. 2.

4 is a diagram illustrating a configuration of the security unit illustrated in FIG. 2.

FIG. 5 is a diagram showing the configuration of the reception restriction server shown in FIG. 1.

6 is a diagram illustrating a digital broadcast receiver reception restriction process according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: terminal device

110: management

111: purchase request message generation module

113: data processing module

115: personal information authentication module

117: EMM request message generation module

130: security department

131: EMM Request Message Password Module

133: EMM information decoding module

150: control unit

300: restriction server

311: EMM request message decoding module

313: EMM information generation module

315: EMM information password module

Claims (13)

The terminal device authentication is initiated when a purchase request for the unlicensed service is requested through a purchase request message corresponding to the requested service, and the terminal device authentication is processed in the following terminal device through personal information input from a service subscriber. After generating the EMM request message for the unlicensed service requested for purchase according to the authentication result, the EMM request message is encrypted with the public key of the corresponding terminal device to generate a password EMM request message, and the generated encrypted EMM. A terminal device for transmitting a request message through an information transmission session; And Decrypts the received encrypted EMM request message with the private key corresponding to the public key of the corresponding terminal device to obtain the EMM request message and encrypts the EMM information about the requested service generated according to the obtained EMM request message with the public key of the corresponding terminal device And a reception restriction server for generating encrypted EMM information and transmitting the generated encrypted EMM information to the terminal device. Generates a purchase request message requested by a service subscriber and initiates terminal device authentication upon purchase request for an unlicensed service through the purchase request message to authenticate the terminal device through personal information input from the service subscriber. A management unit configured to process and generate a viewer qualification information (EMM) request message for an unauthorized service requested to be purchased according to the terminal device authentication result; A security unit configured to generate an encrypted EMM request message by encrypting the generated EMM request message with the public key of the corresponding terminal device, and then transmitting the generated encrypted EMM request message through an information transmission session; And And a control unit which transmits a password EMM request message for a purchase requested service provided from the security unit to a reception restriction server after paying a fee for a service requested to be purchased according to an authentication result of the management unit through a charging unit. Terminal device of a digital broadcast receiver. The method according to claim 2, wherein the management unit, And displaying the purchase request message and displaying the personal information input message of the subscriber when the purchase request is made by the subscriber according to the displayed purchase request message and inputting the personal information of the subscriber based on the displayed personal information input message. Terminal device of a broadcast receiver. The method according to claim 2, wherein the management unit, Generating a purchase request message for requesting the provision of the service if the subscriber is not the subscriber due to the parental control information based on the ECM information received through the selected service among the plurality of services and the parental control information supplied from the reception restriction server. Purchase request message generation module; A data processing module for receiving and displaying the purchase request message and inputting personal information of a service subscriber when a subscriber requests to provide a corresponding service according to the displayed purchase request message; A personal information authentication module for performing authentication on a service subscriber using the personal information of the data processing module; And And an EMM request message generation module for generating an EMM request message for a service requested for purchase after authentication of a subscriber through the personal information authentication module. The method of claim 2, wherein the purchase request message is And at least one of a non-receipt message, purchase goods information for the unlicensed service, a prepaid right for the unlicensed service, a fee information for the unlicensed service, and purchase selection information. The method according to claim 4, wherein the data processing module, Displays a purchase request message provided from the purchase request message generation module of the management unit as a pop-up window, Among the displayed purchase request messages, when a purchase request for an unlicensed service is requested through purchase selection information, a personal information input message of a service subscriber is generated and displayed on a screen. And the personal information input by the service subscriber through the personal information input message is transmitted to the management unit. The method of claim 2, wherein the security unit, And an EMM request message encryption module for generating an encrypted EMM request message by encrypting the EMM request message provided through the EMM request message of the management unit with a public key of the corresponding terminal device and delivering the generated encrypted EMM request message. Terminal device of a digital broadcast receiver. The method of claim 2, wherein the security unit, EMM information decoding module for receiving the encrypted EMM information supplied from the EMM information encryption module of the reception restriction server through the control unit to decrypt the encrypted EMM information with the private key corresponding to the public key of the terminal device to obtain the EMM information. Terminal device of a digital broadcast receiver, characterized in that. delete A purchase request message displaying step of generating and displaying a purchase request message on an on-screen when the service selected by the service subscriber is an unlicensed service; When the purchase request for the non-licensed service is performed together with the service subscriber personal information through the purchase request message on the screen, the terminal device authentication is initiated and the terminal device authentication is performed through the personal information input from the service subscriber. An EMM request message generating step of generating an EMM request message for a service requested for purchase according to a result of the terminal device authentication and delivering the same to an information transmission session; An EMM request message encryption step of encrypting the generated EMM request message with a public key of a corresponding terminal device to generate an encrypted EMM request message and then transmitting the generated encrypted EMM request message to an information transmission session; And And receiving an encrypted EMM request message and transferring the encrypted EMM request message for the requested purchase service to a reception restriction server after charging the purchased requested service. How to restrict reception. The method according to claim 10, wherein the method, After receiving the encrypted EMM request message, the receiving restriction server decrypts the private key corresponding to the public key of the corresponding terminal device to obtain the EMM request message, and then generates EMM information on the service requested for purchase based on the obtained EMM request message. Generating an EMM; An EMM encryption step of encrypting the generated EMM information with a public key of the corresponding terminal device to generate encrypted EMM information and then providing the generated encrypted EMM information to the corresponding terminal device; And And a data receiving step of decoding the encrypted EMM information received by the corresponding terminal device into a private key corresponding to the corresponding public key to obtain the EMM information, and then providing a service requested for purchase with the obtained EMM information. Restriction method for broadcast receivers. The apparatus of claim 10, wherein the purchase request message comprises one of an unreceivable message, purchase product information for an unlicensed service, a prepaid right for an unlicensed service, a fee information for an unlicensed service, and purchase selection information. A method of limiting reception of a digital broadcast receiver, comprising at least one. The method of claim 10, wherein the displaying of the purchase request message comprises: Display the purchase request message in a pop-up window, and generate a personal information input message for receiving personal information by a service subscriber when a purchase request for an unlicensed service is requested through purchase selection information among the displayed purchase request messages. A reception restriction method of a digital broadcast receiver, characterized in that for displaying.

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