KR20110014055A - Dmb conditional access system and method for building the same - Google Patents

Dmb conditional access system and method for building the same Download PDF

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Publication number
KR20110014055A
KR20110014055A KR1020090071819A KR20090071819A KR20110014055A KR 20110014055 A KR20110014055 A KR 20110014055A KR 1020090071819 A KR1020090071819 A KR 1020090071819A KR 20090071819 A KR20090071819 A KR 20090071819A KR 20110014055 A KR20110014055 A KR 20110014055A
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South Korea
Prior art keywords
receiver
dmb
viewing
information
sms
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KR1020090071819A
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Korean (ko)
Inventor
곽대원
곽승철
김기훈
서정철
Original Assignee
주식회사 가인정보기술
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Priority to KR1020090071819A priority Critical patent/KR20110014055A/en
Publication of KR20110014055A publication Critical patent/KR20110014055A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The present invention provides a method for delivering separate viewing entitlement information to a digital multimedia broadcasting (DMB) receiver capable of short message service (SMS) and a dedicated receiver not supporting an SMS function, and a program delivered from the receiver to viewing entitlement information and DMB broadcasting. A method for constructing a DMB reception restriction system and a DMB reception restriction system for enabling broadcast reproduction using information, the system comprising: a CAS for generating a broadcast program-specific CAS message for applying a reception restriction in a DMB broadcast; A DMB ensemble matching server for matching CAS messages generated by the CAS with DMB broadcasting; A receiver management server that is in charge of receiver management and manages DMB viewing entitlement and communicates with receivers; A database for managing DMB program and receiver information; An SMS gateway for transmitting viewing credential information; And an SMS-capable receiver or a dedicated receiver for receiving and playing DMB according to the viewing qualification.

Description

 DMB conditional access system and method for building the same}

The present invention relates to a method of constructing a conditional access system (CAS) for limiting the number of receivers in providing a digital multimedia broadcasting (DMB) service, and more specifically, a DMB capable of short message service (SMS). Broadcasting can be played by using a method of delivering separate viewing qualification information to a receiver (hereinafter referred to as a receiver) and a receiver (hereinafter, a dedicated receiver) that does not support the SMS function, and a program information transmitted from the viewing qualification information and a DMB broadcast by the receiver. It's about how to do that.

In general, DMB (Digital Multimedia Broadcasting) is a technology that provides a multimedia data transmission service, such as text broadcasting, radio calls, still images by digitizing the radio broadcast. The DMB was developed to replace terrestrial analog radio broadcasting. However, due to the advancement of the technology, a large amount of data can be transmitted within a limited propagation area, and thus not only audio data but also DVD-level video data can be transmitted.

Conditional Access System (CAS) is a key element technology required to implement a paid business model that allows only the customers who purchase the right to receive the service through authentication of service reception of paid broadcasting. Therefore, everything from low-level technology for encrypting and transmitting content to high-level technology for processing user subscription and billing is required.

Therefore, CAS can be applied in various environments, for example, Internet-based IPTV, airwave broadcasting such as Terrestrial Digital Multimedia Broadcasting (T-DMB), satellite broadcasting environment such as satellite DMB, or wired cable environment. Basically, CAS is the same concept, but depending on the environment in which it is applied, each form is adapted to that environment.

A typical CAS includes a process of scrambling data at a transmitting end, encrypting a control word (CW) used for scrambling with an authentication key (AK), and distributing the authentication key. Key, DK). The receiving end has the same configuration as the transmitting end, decodes the authentication key into the distribution key through the reverse process, obtains the control word again with the decrypted authentication key, and descrambles the data through the obtained control word to output a viewable signal. Done.

Transmission is applied by applying the reception restriction to the DMB broadcast, and only the authorized receiver should be able to play it, and the viewing qualification of the receiver should be enforced according to the policy of the reception restriction operator. In general, CAS sends a CAS message (hereinafter referred to as an Entitlement Control Message (ECM) and an Entitlement Management Message (EMM) message) when transmitting a DMB broadcast. To enforce this, the corresponding CAS message should be generated. It must be transmitted within the limited CAS message bandwidth within the DMB transmission bandwidth, and it takes a long time to receive CAS messages for each receiver, and furthermore, there is a practical limit on the number of authorized receivers.

The present invention has been made to solve the above problems, and the method of entitlement of viewing to the receiver in the CAS is not limited to the number of receivers in the DMB service without using the CAS message in the existing DMB broadcasting bandwidth. The purpose is.

In addition, the present invention has another object to find a way to grant the viewing qualification to the dedicated receiver, in addition to the way to grant the program viewing qualification using SMS.

DMB reception restriction system according to the present invention for achieving the above object, CAS for generating a broadcast program-specific CAS message for applying the reception restriction in the DMB broadcast; A DMB ensemble matching server for matching CAS messages generated by the CAS with DMB broadcasting; A receiver management server that is in charge of receiver management and manages DMB viewing entitlement and communicates with receivers; A database for managing DMB program and receiver information; An SMS gateway for transmitting viewing credential information; And it is characterized in that it is configured to include an SMS-capable receiver or a dedicated receiver for receiving and playing DMB according to the viewing qualification.

Here, the CAS manages the connection with the DMB ensemble matching server, selects a program to apply the reception restriction on the basis of the ensemble information broadcasted through the DMB ensemble matching server at the time of a new connection, for reception restriction A DMB Multiplexer connection management unit for transmitting a CAS message to the DMB ensemble matching server, a control word securely included in the ECM, delivered to a receiver, an encryption key for encrypting the control word itself, and controlled by a malicious user A control word encryption key generation unit that periodically changes a control word encryption key to prevent damage of the word leakage, and the EMM generation unit generating an EMM including an encryption key generated by the control word encryption key generation unit; The DMB Multiplexer Connection Manager generates an encryption key for scrambled the DMB program to which the reception restriction is applied. The control word generation unit for transmitting to the DMB ensemble matching server through the DMB ensemble matching server or scramble the program content using a control word, matching the ensemble, and transmitting the control word to the receiver. ECM generation unit for generating an ECM, and the DMB program configuration to apply the reception restrictions generated by the receiver management server and the DMB program that is actually broadcast, integrated management and DMB to set whether or not to apply the reception restriction through the UI to the administrator It is characterized by being configured with a program management unit.

The receiver management server may further include: a receiver manager that manages the viewer's viewing information and the expiration date of the receiver, a viewing rights management unit that creates and manages the viewing rights in the DMB program; An SMS interface that receives DMB program viewing eligibility information corresponding to the viewing eligibility requested from the eligibility management unit and reconfigures it into an SMS and delivers it to the receiver, and when receiving a viewing eligibility request through the web service, the viewing eligibility requested from the viewing eligibility management unit It is characterized by having a web service interface for transmitting the DMB program viewing entitlement information to a receiver through a web server.

On the other hand, the DMD reception restriction system construction method according to the present invention for achieving the above object, the first step of transmitting the viewing credentials to the SMS-enabled receiver in the receiver management server when requesting the viewing credentials in the SMS-capable receiver ; A second step of, when a dedicated receiver which does not support an SMS function requests viewing entitlement information through a web service, the receiver management server transmitting the viewing entitlement information to the dedicated receiver through a web service; And a third step of updating, at the SMS-capable receiver or the dedicated receiver, the changed program information and the viewing credential information from the receiver management server according to the viewing credential information received at the receiver management server.

The first step may include generating and transmitting an SMS message requesting the DMB program viewing qualification from the SMS capable receiver to the receiver management server, and the receiver management server according to the received SMS message. Converting the data into an SMS message format and transmitting the converted SMS message to the receiver capable of receiving the SMS message; and after the SMS capable receiver receives the viewing credential information SMS message, transmits a confirmation SMS message to the receiver management server, and analyzes the SMS message. Extracting program viewing entitlement information within the terminal, correcting the viewing entitlement information of the receiver, receiving the confirmation SMS message by the receiver management server, confirming that the receiver has received the viewing entitlement, and modifying the receiver information. It is characterized by including.

The second step may include connecting a dedicated receiver to a user computer to request a DMB viewing entitlement using a web service, and the receiver management server receiving a viewing entitlement request from the user computer through the web service. Afterwards, the viewing credential information is transmitted to the user computer through a web service, and after the user computer receives the viewing credential information, a confirmation message is transmitted to the receiver management server through the web service. After extracting the information, modifying the viewing entitlement information of the connected dedicated receiver, receiving the confirmation message by the receiver management server, confirming that the dedicated receiver has received the viewing entitlement, and modifying the dedicated receiver information. It is characterized by including.

In the third step, the SMS-capable receiver periodically receives an EMM message through a DMB broadcasting channel to extract DMB program information included in the EMM; Comparing the version information of the program information delivered to the EMM, and if the program version information stored in the internal version is a lower version, generating an SMS message requesting the renewal of the viewing qualification to transmit to the receiver management server; Receiving, by the receiver management server, an SMS message including the latest viewing credential information to the receiver, and receiving the latest viewing credential information from the receiver management server, and modifying the viewing credential information of the receiver. Its features are made to include.

The above-described method for constructing a DMB reception restriction system and a DMB reception restriction system according to the present invention has the following effects.

That is, by using the SMS and the existing communication network instead of the DMB transmission channel, the program viewing entitlement information is transmitted to the receiver, so that the bandwidth used as the reception restriction message in the DMB transmission channel is independent of the number of receivers.

DMB reception restriction system and a method for constructing a DMB reception restriction system according to the present invention having the above characteristics will be described in more detail with reference to the accompanying drawings.

1 is a block diagram illustrating a system for providing a DMB service to which reception restrictions are applied according to the present invention.

The DMB reception restriction system according to the present invention, as shown in FIG. 1, includes a conditional access server (CAD) 200; A DMB Multiplexer Matching Server (DMB Multiplexer) 300; A receiver management server (RMS) 400; Reception restriction database 500; SMS gateway 600; Receiver management web server 700; It is configured to include SMS capable DMB receiver and DMB dedicated receiver.

The CAS 200 generates a control word (CW), which is a scramble encryption key for each DMB broadcast program to which the reception restriction is applied, and generates an ECM for delivering an encrypted control word to transmit the generated control word to a receiver. It transmits to the multiplexer 300, generates an EMM to transmit the program information to the receiver, and transmits it to the DMB multiplexer 300, and changes the periodic encryption key to ensure the safe receiver delivery of control words.

The DMB Multiplexer 300 merges the CAS message delivered from the CAS 200 into a DMB ensemble to which reception restrictions are not applied, and encrypts the broadcast content using the control word.

The RMS 400 generates and manages the viewing entitlement of the broadcast program to which the reception restriction is applied, and transmits the program viewing entitlement to an authorized receiver.

The reception restriction database 500 stores broadcast program information and encryption key information applied to the reception restriction, and stores and manages state information of receivers entitled to viewing.

The SMS gateway 600 is a system that is responsible for transmitting the viewing entitlement between the receiver and the RMS 400. When the receiver transmits an SMS message to the RMS 400, the SMS is transmitted through the SMS gateway 600. Is passed to 400. Likewise, the RMS 400 passes through the SMS gateway 600 to transfer the viewing entitlement to the receiver.

The receiver management web server 700 is a scheme for granting a viewing qualification to a dedicated receiver. The receiver user requests a viewing qualification from a receiver web service using a PC. Pass the viewing qualification to the terminal connected by wire.

The receiver stores the DMB viewing entitlement information, extracts a control word using the CAS information of the ECM and the EMM received through the DMB transmission channel, descrambles the broadcast program, and then plays it on the screen. In addition, a message indicating that there is no viewing qualification is displayed on the screen for the broadcasting program without viewing qualification.

The SMS-enabled receiver transmits and receives a viewing entitlement request to the RMS 400 through SMS, whereas the dedicated receiver connects the receiver directly to a PC and receives the viewing entitlement via a web service.

Hereinafter, a detailed configuration of the CAS 200 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a detailed block diagram of the CAS 200 according to an embodiment of the present invention.

The configuration of the CAS 200 according to an embodiment of the present invention, the DMB Multiplexer connection management unit block 210, control word encryption key generation unit 220, EMM generation unit 230, DMB program management unit 240, control word The generator 250 and the ECM generator 260 are provided.

 The DMB Multiplexer Connection Manager block 210 is a block that manages the connection with the DMB Multiplexer 300. The DMB Multiplexer connection manager block 210 is a program for applying a reception restriction based on the ensemble information broadcasted through the DMB Multiplexer 300 upon a new connection. Will be selected. In addition, the integrated management of one or more DMB Multiplexer (300). A CAS message for reception restriction is transmitted to the DMB Multiplexer 300.

The control word encryption key generation unit 220 securely stores the control word in the ECM and delivers the control word to the receiver, and generates an encryption key for encrypting the control word itself in a way to obtain the control word from the received receiver. Function. In addition, the control word encryption key is changed periodically and the change period is made as short as possible, but cannot be smaller than the transmission period of the EMM, in order to prevent damage of the control word leakage by the malicious user.

The EMM generator 230 generates an EMM including an encryption key generated by the control word encryption key generator 220.

The control word generator 250 generates a cryptographic key for scrambled the DMB program to which the reception restriction is applied. The generated control word is transmitted to the DMB multiplexer 300 through the DMB Multiplexer connection manager block 210, and the program content is scrambled using the control word in the DMB multiplexer 300, and then matched with an ensemble. Send it out. In addition, the control word is periodically changed to prevent damage of the control word leakage by the malicious user, and the change word is made as short as possible, but cannot be smaller than the transmission period of the ECM.

The ECM generator 260 functions to generate an ECM for safely transmitting the control word to the receiver.

The DMB program manager 240 is a block for managing a program to which the reception restriction is to be applied. The DMB program configuration to manage the DMB program configuration to be applied to the reception restriction generated by the RMS 400 and the DMB program that is actually broadcasted are integrated to the administrator. Enable or disable the reception restriction through.

In addition, the configuration and operation of the RMS 400 according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

3 is a detailed block diagram of the RMS 400 according to a preferred embodiment of the present invention.

The RMS 400 according to the present invention includes a receiver manager 410, an SMS interface 420, a viewing entitlement manager 430, and a web service interface 440.

The receiver manager 410 is a block for managing the information of the receiver that has granted the viewing qualification.

When the SMS interface 420 receives a viewing qualification request from the receiver, the SMS interface 420 receives DMB program viewing qualification information corresponding to the viewing qualification requested from the viewing qualification management unit 430, and reconfigures the SMS into viewing through the SMS. .

The viewing entitlement management unit 430 functions to generate and manage viewing entitlements in the DMB program.

The web service interface 440 performs a function of processing a viewing entitlement request made through a web service, and the method of configuring viewing entitlement information is the same as the method of configuring the SMS interface 420.

Hereinafter, a procedure for acquiring viewing qualification of a receiver according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The following describes the procedure for acquiring viewing qualifications of an SMS capable receiver and a dedicated receiver separately.

FIG. 4A is a flowchart illustrating a viewing qualification obtaining procedure of an SMS capable receiver according to a preferred embodiment of the present invention, and a schematic method of transmitting a viewing procedure and viewing qualification information to a receiver for an RMS request for a viewing qualification request from a receiver; It is shown.

First, the DMB receiver generates an SMS message requesting the viewing qualification of the DMB program and transmits it to the SMS gateway 600 (S201). The SMS gateway 600 then forwards the SMS message to the RMS 400 (S202).

Subsequently, the SMS interface 420 in the RMS 400 is in charge of processing the SMS message, and requests the viewing entitlement management unit 430 to view the viewable DMB program information (S203). The viewing entitlement management unit 430 inquires the DMB program information list in the reception restriction database 500 (S204, S205), and returns the DMB program list information inquired through the SMS interface (S206).

Thereafter, the SMS interface 420 converts the viewing entitlement information to be transmitted to the receiver into an SMS message format (S207), and transmits an SMS message to the SMS gateway 600 (S208). The SMS gateway 600 transfers the SMS message received from the RMS 400 to the receiver (S209).

Thereafter, after receiving the viewing qualification delivery SMS message, the receiver transmits the viewing qualification delivery confirmation SMS message to the SMS gateway 600 (S210). In addition, the receiver analyzes the SMS, extracts program viewing entitlement information from the message, and then corrects the viewing entitlement information of the receiver (S212). The SMS gateway 600 transmits the viewing qualification delivery confirmation SMS message to the RMS 400 (S211). The SMS interface 420 in the RMS 400 receives the viewing qualification delivery SMS and confirms the viewing qualification delivery to the receiver managing unit 410 (S213). It is confirmed that the receiver has received the viewing entitlement, and accordingly the receiver information is modified in the reception restriction database 500 (S214 and S215).

4B is a flowchart illustrating a viewing qualification acquisition procedure of a dedicated receiver according to a preferred embodiment of the present invention, and a schematic method of transmitting a viewing procedure and a viewing qualification information to a receiver for an RMS request for a viewing qualification request from a receiver. It is shown.

First, the DMB receiver connects to the user computer and requests the receiver information from the user computer (S301). The DMB receiver responds with status information of the receiver (S302), and accesses the receiver management web server 700 to request the DMB viewing qualification (S303). The receiver management web server 700 requests viewing qualification to the web interface 440 of the RMS 400 (S304). The web interface 440 makes a request for viewing DMB program information to the viewing entitlement management unit 430 (S305). The viewing entitlement management unit 430 inquires the DMB program information list in the reception restriction database 500 (S306, S307), and returns the DMB program list information inquired by the web interface 440 (S308). The web interface 440 requests the receiver manager 410 to correct the receiver information (S309), and the receiver manager 410 modifies the receiver information in the reception restriction database 500 (S310, S12). .

In addition, the web interface 440 transmits the viewing qualification information of the receiver to the receiver managing web server 700 (S311), and the receiver managing web server 700 transmits the viewing qualification information to a user computer (S313). ). The user computer modifies the viewing qualification information of the receiver (S314, S315).

In addition, a method of updating program information and viewing qualification information changed from the RMS in the DMB receiver according to the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a flowchart illustrating a method of updating program information and viewing entitlement information changed from RMS in a DMB receiver according to an exemplary embodiment of the present invention, showing a processing procedure in the receiver.

First, the receiver periodically receives the EMM message through the DMB broadcast channel (F301). The DMM program information included in the EMM is extracted by analyzing the EMM message (F302). The DMB program information consists of a program identifier, version information, and a decryption key segment.

Subsequently, the receiver compares the viewable program version information stored in the receiver with the version information of the program information delivered to the EMM (F303). When the program version information in the receiver is a lower version, an SMS message requesting renewal of the viewing qualification is requested. Generate (F304).

Thereafter, the SMS message is transmitted to the RMS 400 (F305), and the SMS including the latest viewing credential information is received from the RMS 400 (F306), and the viewing credential information of the receiver is modified (F307).

1 is a block diagram showing a system for providing a DMB service to which reception restrictions are applied according to the present invention;

2 is a detailed configuration diagram of the CAS 200 according to an embodiment of the present invention.

3 is a detailed block diagram of an RMS 400 according to an embodiment of the present invention.

4A is a flowchart illustrating a procedure for acquiring viewing qualification of an SMS capable receiver according to the present invention.

4b is a flowchart illustrating a viewing qualification acquisition procedure of a dedicated receiver not supporting the SMS function according to the present invention.

5 is a flowchart illustrating a procedure for updating program information and viewing entitlement information changed from the RMS in the DMB receiver according to the present invention.

Explanation of symbols on the main parts of the drawings

200: restriction server

210: DMB Multiplexer Connection Manager Block

220: control word encryption key generation unit 230: EMM generation unit

240: DMB program management unit 250: control word generation unit

260: ECM generation unit 300: DMB ensemble matching server

400: DMB receiver management server 410: receiver management unit

420: SMS interface 430: View credential management unit

440: Web Service Interface 500: Restriction Database

600: SMS Gateway 700: DMB Receiver Administration Web Server

Claims (7)

A CAS for generating a broadcast program-specific CAS message for applying reception restriction in DMB broadcasting; A DMB ensemble matching server for matching CAS messages generated by the CAS with DMB broadcasting; A receiver management server that is in charge of receiver management and manages DMB viewing entitlement and communicates with receivers; A database for managing DMB program and receiver information; An SMS gateway for transmitting viewing credential information; And DMB reception restriction system, characterized in that it comprises an SMS-capable receiver or a dedicated receiver for receiving and playing DMB according to the viewing qualification. The method of claim 1, The CAS manages a connection with the DMB ensemble matching server, selects a program to apply reception restriction based on the ensemble information broadcasted through the DMB ensemble matching server at the time of a new connection, and selects a CAS message for reception restriction. A DMB Multiplexer connection management unit for transmitting a to the DMB ensemble matching server; The control word is safely included in the ECM and transmitted to the receiver, the encryption key for encrypting the control word itself is generated, and the control word encryption key is periodically changed to prevent the damage of the control word leakage by the malicious user. A control word encryption key generation unit, The EMM generator for generating an EMM including an encryption key generated by the control word encryption key generator; After generating an encryption key for scrambled the DMB program to which the reception restriction is applied and delivers it to the DMB ensemble matching server through the DMB Multiplexer connection management unit, or scramble the program content in the DMB ensemble matching server using a control word The control word generator for matching and transmitting an ensemble; An ECM generator for generating an ECM for safely transmitting the control word to a receiver; DMB program configuration to apply the reception restrictions generated by the receiver management server and the DMB program actually broadcast, and the DMB program management unit configured to set whether or not to apply the reception restrictions through the UI to the administrator Restriction system. The method of claim 1, The receiver management server may include: a receiver manager configured to manage viewing qualification information and a period of expiration of the receiver;  A viewing entitlement management unit that creates and manages viewing entitlements in a DMB program; An SMS interface for receiving DMB program viewing qualification information corresponding to the viewing qualification requested from the viewing entitlement management unit when the receiver receives the viewing entitlement request via SMS, reconstructing it into an SMS, and delivering the received entitlement to the receiver; DMB reception restriction system, characterized in that it comprises a web service interface for transmitting the DMB program viewing qualification information corresponding to the viewing qualification requested from the viewing qualification management unit to the receiver through the web server when the viewing qualification request is received through the web service. . Transmitting, by the receiver management server, the viewing credential information to the SMS capable receiver when the viewing capability information is requested by the SMS-capable receiver; A second step of, when a dedicated receiver which does not support an SMS function requests viewing entitlement information through a web service, the receiver management server transmitting the viewing entitlement information to the dedicated receiver through a web service; And  And a third step of updating, at the SMS-capable receiver or the dedicated receiver, the changed program information and the viewing credential information from the receiver management server according to the viewing credential information received at the receiver management server. How to build your system. The method of claim 4, wherein The first step may include: generating an SMS message requesting the DMB program viewing qualification from the SMS capable receiver and transmitting the SMS message to the receiver management server; The receiver management server converts the viewing entitlement information into an SMS message format according to the received SMS message, and transmits it to the SMS capable receiver;  After the SMS-capable receiver receives the viewing credential information SMS message, transmits a confirmation SMS message to the receiver management server, extracts the program viewing credential information from the message by analyzing the SMS, and then modifies the viewing credential information of the receiver. Steps, And receiving, by the receiver management server, a confirmation that the receiver is entitled to view by receiving the confirmation SMS message, and modifying the receiver information. The method of claim 4, wherein The second step may include connecting a dedicated receiver to the user's computer to request the DMB viewing entitlement using the web service; Receiving, by the receiver management server, a viewing qualification request from the user computer through the web service, and transmitting viewing qualification information to the user computer through a web service; After the user computer receives the viewing qualification information, transmitting a confirmation message to the receiver management server through a web service, extracting the viewing qualification information, and modifying viewing qualification information of the connected dedicated receiver; And receiving, by the receiver management server, confirming that the dedicated receiver has received the viewing entitlement, and modifying the dedicated receiver information. The method of claim 4, wherein In the third step, the SMS-capable receiver periodically receives an EMM message through a DMB broadcasting channel to extract DMB program information included in the EMM; Comparing, by the SMS-capable receiver, version information of viewable program version information stored therein with program information delivered to the EMM; When the program version information stored in the receiver is a lower version, generating an SMS message requesting the renewal of viewing entitlement and transmitting it to the receiver management server; Transmitting, by the receiver management server, an SMS message including the latest viewing credential information to the receiver; And receiving, by the SMS-capable receiver, the latest viewing credential information from the receiver management server and modifying the viewing credential information of the receiver.
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