KR100256179B1 - Preventing method of double charge using double charge prevention smart card for pay-tv - Google Patents

Abstract

PURPOSE: A method for preventing a double charge using a charged broadcasting double charge prevention smart card is provided to prevent a double charge of a user by enabling a double charge prevention smart card to read an identifier of a relevant program and to compare the identifier with identifiers of programs recorded. CONSTITUTION: A subscriber receives a double charge prevention card(401). A subscriber management center records a receipt requirement and all sorts of keys for a channel selected by the subscriber(402). A broadcasting receiver judges whether the form of the card is prepayment or post payment(403). A fixed amount token is recorded in the smart card(404). A control word is transmitted to the receiver(405). It is judged whether a program identifier in the card corresponded to a program identifier in an entitlement control message exists(406). In case that the identifier exists, a viewing is permitted(407). In case that the identifier doesn't exist, viewing specifications are recorded(408), and a viewing is permitted(409). The subscriber can perform a receiver general command(410). Viewing specifications are changed and recorded from the beginning(411).

Description

Duplicate billing prevention method for pay broadcasting Duplicate billing prevention method using smart card

The present invention relates to a double charge prevention method using a double charge prevention card, in particular, for a pay broadcast that can distinguish between whether the program selected by the user is a pay broadcast or a free broadcast and charge accordingly to prevent a double charge Duplicate charge prevention The present invention relates to a duplicate charge prevention method using a smart card.

Pay Per View is a program that has a fixed fee per program, so you can watch the program only when you pay the fee. In general, a card for receiving direct satellite broadcasts using Mugunghwa satellite is used when watching a pay-per-view pay-per-view program. This method uses a channel identifier instead of a program identifier, which shortens processing time and provides convenience in pay broadcasting operation. However, there is a big disadvantage that the charge is duplicated due to the mistake of the receiving subscriber. In addition, even in the case of a bus card, a single service method using only a service use time difference is applied, which has a problem in that a duplicate charging problem cannot be completely prevented in determining a threshold of time.

Accordingly, the present invention distinguishes between the types of duplicate charge prevention smart cards and stores program identifiers in the duplicate charge prevention smart cards so that when the subscriber selects a program, the identifiers of the pre-listed programs recorded therein are read by reading the identifier of the corresponding program. The purpose of the present invention is to provide a method of preventing duplicated charges using a duplicated billing prevention smart card for pay broadcasting, which can prevent the duplicated billing problem that may occur when watching a pay-per-view program by comparing the same program.

Duplicate billing prevention method according to the present invention for achieving the above object is a step of issuing a duplicate billing prevention smart card for paying broadcasting to the subscriber, and recording the channel reception qualification and various keys in the issued duplicate billing prevention smart card And determining whether the issued duplicate billing prevention smart card is prepaid or postpaid, and if the result of the determination of the card type is prepaid, recording a token of a specified amount in the duplicate billing prevention smart card; Transmitting, to the receiver, a control word from the received entitlement control message of the selected channel; determining whether there is a program identifier in the duplicate charging prevention smart card that matches the program identifier in the received entitlement control message; Judgment result of program identifier existence Authorizing viewing if an asterisk exists; and if a matching identifier does not exist as a result of the determination of the existence of the matching program identifier, the token is decreased and the viewing is allowed after recording a viewing history such as a channel number and a current program identifier. And deleting the recorded viewing history when the amount of recording of the viewing history exceeds a predetermined amount; and receiving a control word that decodes a reception entitlement control message of a channel selected by the subscriber when the card type decision is postpaid. Determining whether there is a program identifier that matches the program identifier of the duplicate charging prevention smart card in the viewing entitlement control message, and wherein a matching program identifier exists as a result of the determination of the existence of the matching program identifier. Steps to authorize viewing And recording a viewing history and permitting viewing when the matching program identifier does not exist as a result of determining whether the matching program identifier exists, uploading and outputting the viewing history, and recording amount of the viewing history. If exceeding a certain amount is characterized in that the step consisting of deleting the recorded viewing history.

1 is a schematic diagram of a pay broadcasting system to which a duplicate charging prevention smart card according to the present invention is applied;

Figure 2 is a block diagram illustrating a hardware structure of a redundant charging prevention smart card according to the present invention.

Figure 3 is a block diagram illustrating the software structure of a redundant charge prevention smart card according to the present invention.

Figure 4 is a flow chart illustrating a duplicate charging prevention method using a duplicate charging prevention smart card according to the present invention.

<Description of Signs of Major Parts of Drawings>

11: broadcast center 12: subscriber management center

13: communication path 14-1 to 14-n: broadcast receiver

15-1 to 15-n: duplicate charging prevention smart card

16: public switched data network

21: RAM 22: EEPROM

23: central processing unit 24: input and output device

25: ROM

31: main block 32: common function block

33: I / O processing block 34: Encryption processing block

35: EPIROM erase / write block 36: Issue command processing block

37: secure command processing block 38: receiver command processing block

39: ECM instruction processing block 40: EMM instruction processing block

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a schematic diagram of a pay broadcasting system to which a duplicate charging prevention smart card according to the present invention is applied.

The broadcast center 11 broadcasts a program and program information for each channel, an entitlement control massage (hereinafter referred to as an ECM), a usage history record / erase message, and the like for each channel using the limited reception system. The subscriber management center 12 manages subscribers and is responsible for charging according to the viewing record of paying broadcasting, and the communication path 13 broadcasts broadcasting of each program and various messages in all broadcasting systems to which the limited reception function is applied. . This communication path 13 is constructed using any one of satellite, terrestrial wave, optical cable and coaxial cable. The broadcast receivers 14-1 to 14-n are separate receivers for receiving respective broadcasts, and are redundant charge preventing smart cards 15-1 to 15- through the Public Switched Data Network (PSDN) 16. n) data can be exchanged with each other, and duplicated charge prevention smart card 15-1 to 15-n readers are built in. In addition, the redundant charge prevention smart card 15-1 to 15-n provides a limited reception function that allows reception according to the reception authority of the subscriber.

The operation of the pay broadcasting system configured as described above is as follows.

A subscriber who wants to watch a broadcast to which a pay broadcasting system is applied, purchases or rents a broadcast receiver, visits the subscriber management center 12, determines a channel to watch and subscribes, and receives a duplicate charge prevention smart card. The new subscriber who is issued the duplicate charge prevention smart card installs the duplicate charge prevention smart card in his broadcast receivers 14-1 to 14-n. After that, when the subscriber selects a specific channel, the duplicate charge prevention smart card determines whether the selected channel is a paid channel, a free channel, a subscribed channel, or an unsubscribed channel, and notifies the broadcast receivers 14-1 to 14-n. . If the program of the channel selected by the subscriber is a free channel, the broadcast receivers 14-1 to 14-n transmit the channel as it is to TV for viewing. If the program of the selected channel is a subscribed channel, the duplicate charging prevention smart card decodes the ECM periodically transmitted by the broadcast receivers 14-1 to 14-n, generates a control word, and transmits it to the broadcast receiver. 14-1 to 14-n transmit the corresponding channel to the TV to watch by using the control word. In addition, if the program of the currently selected channel is a billing program, the fee is set per program and the subscriber is required to enter a password to check the billing. If the password entered by the subscriber matches the password stored in the duplicate charge prevention smart card, the duplicate charge prevention smart card starts to prepare for viewing the channel. Thereafter, the receiver receives the ECM transmitted from the corresponding channel and compares the program identifier in the ECM with the program identifier recorded in the viewing history recording place inside the duplicate charging prevention smart card. If there is a matching program identifier as a result of the comparison, the control word is output to be regarded as continuous viewing of the same program, and if there is no matching program identifier, the viewing history is recorded in a new area. This viewing history plays a role of recording the channel number and the current program identifier, and outputting the control word for viewing.

If the subscriber chooses postpay, if the number of viewing records for the billing program exceeds a certain number or receives a periodic uploading of the viewing history, the duplicate charging prevention smart card requests the broadcast receivers 14-1 to 14-n to establish a telephone line. The usage record stored in the card is transmitted to the subscriber management center 12 through. When the transmission of the viewing history record is completed, it is transmitted from the subscriber management center 12 and waits for a usage record erasing message to come, and when the message arrives, the subscriber management center 12 checks whether or not authentication is performed. As a result of confirming whether the subscriber management center 12 is authenticated, in case of normality, all transmission history record is erased, and in case of abnormality, it waits until a normal authentication message arrives. In the case of interruption due to a communication channel problem during transmission of the viewing history record, transmission of the usage record is periodically retried.

If the subscriber adopts the prepaid method, the user loads a certain amount of tokens in advance and deducts the token corresponding to the corresponding program fee from the anti-duplicate smart card when watching the billing program. If the token of the subscriber is less than the corresponding billing program fee, the subscriber cannot watch the program and the subscriber can add the token by visiting the subscriber management center 12 or by telephone.

When the subscriber management center 12 receives a change of various keys or an entitlement management message (hereinafter referred to as an EMM) for a channel, it confirms the authentication and changes and stores the contents in the duplicate charging prevention smart card. do.

FIG. 2 is a block diagram illustrating a hardware configuration of a redundant billing prevention smart card according to the present invention. FIG. 2 is a configuration and connection relationship of hardware configured in one chip that performs a function of a redundant billing prevention smart card. Is shown.

When a command from the outside is transferred to the duplicate charging prevention smart card, a random access memory (hereinafter referred to as RAM) 21 temporarily stores the values and the processing result. EEPROM (Electrically Erasable Programmable Read Only Memory) is a record of the subscriber's personal information, history of usage of billing programs with tokens added to prepaid subscribers, and various key and channel eligibility for change. Or erased. The central processing unit (23) manages all other hardware and drives programs stored in the ROM (Read Only Memory; hereinafter referred to as ROM) 25 according to commands to calculate using the RAM 21, and then EEPROM ( 22) record or erase and control the exchange of messages with the outside. The input / output device 24 contacts the outside to perform a power supply, a reset signal, a clock, and a data input / output function. The ROM 25 records various programs for operating the redundant charge preventing smart card and performs the function of the redundant charge preventing smart card through the central processing unit 23.

All messages input from the outside are transmitted to the central processing unit 23 through the input / output unit 24 and the result processed by the RAM 21 in the program on the ROM 25 driven by the central processing unit 23 is returned. The data is recorded or erased in the EEPROM 22 or transmitted to the outside through the input / output device 24 again.

FIG. 3 is a block diagram illustrating a software configuration of a redundant charging prevention smart card according to the present invention. The software configuration is recorded in a ROM (25 of FIG. 2) and stored in the ROM (23 of FIG. 2) when necessary. ) And perform its function. In addition, all processing blocks set up a function program and a common function so that they can be jointly used in each function program. The common function block 32 includes an input / output processing block 33, an encryption processing block 34, and an Epyrom erase / write block 35.

The main block 31 recognizes a message input from the central processing unit (23 of FIG. 2) as a command and performs a corresponding function in the case of a normal command. If it is not a normal command, or if there is an illegal record retrieval or deletion attempt, the countermeasure function is performed. The input / output processing block 33 of the common function block 32 performs a function of recognizing and transmitting a message among input signals or loading a message to be output on an input / output transmission path and transmitting it to the outside. The encryption processing block 34 encrypts the message in the case of a message requiring security among the messages to be encrypted or decrypted and obtained. The EPROM erase / record block 35 performs the function of recording or erasing subscriber information, usage record, various key and channel receiving entitlements, and the like. The issuance command processing block 36 records each subscriber information and a key generation matrix for generating a key when issuing a duplicate charge prevention smart card and sets each command in the step of setting the subscriber to a state that the subscriber can use. Process. The security command processing block 37 maintains security, such as charging related information in a duplicate charging prevention smart card that has been issued and provided to a subscriber, inputting a new password, releasing the function of the card, and discarding the card at the end of its life. Has the function to process the necessary commands and can only be performed at the subscriber management center. The receiver command processing block 38 performs the function of the subscriber inserting his or her duplicate anti-charge smart card into the broadcast receiver (14-1 to 14-n of FIG. 1) to watch the broadcast or change the password. The ECM command processing block 39 performs a function of processing the ECM transmitted from the broadcast receiver (14-1 to 14-n in FIG. 1) to receive the corresponding channel when the subscriber channel or the paid channel is selected by the subscriber. Perform. The EMM command processing block 40 interprets the corresponding message among the messages transmitted to the broadcast receiver (14-1 to 14-n in FIG. 1), and in the case of the authenticated message, changes the key or the channel receiving qualification according to the message content. And the token setting function.

4 is a flowchart illustrating a method for preventing duplicate charging of a duplicate charging prevention smart card using a program identifier according to the present invention.

First, a subscriber who wants to watch a broadcast to which a pay broadcasting system is applied receives a duplicate charge prevention smart card from the subscriber management center (401). The subscriber management center records 402 the reception entitlement, various keys, etc. for the channel selected by the subscriber. It then determines whether the card is prepaid or postpaid. When the subscriber management center records the type of the card in the duplicate charge prevention smart card at the request of the subscriber, the duplicate charge prevention smart card only executes the commands that can be performed in the form recorded on the card. Thereafter, when the subscriber installs a duplicate charging prevention smart card in his receiver and selects a program, the broadcast receiver determines whether the card is prepaid or postpaid (403). As a result of determining the card type, if the card type is prepaid, the following broadcast service process is performed for the prepaid card.

First, in the broadcast service process, the token of the designated amount is recorded 404 on the duplicate charge prevention smart card, and then the control word, which decodes the reception qualification control message of the channel selected by the subscriber, is transmitted to the receiver 405. Thereafter, it is determined whether there is a program identifier in the duplicate charging prevention smart card that matches the program identifier in the receiving entitlement control message (406), and if the matching identifier exists, the viewing is allowed (407). If there is no matching identifier, the token is decremented, and the viewing history such as the channel number and the current program identifier is recorded (408) and the viewing is allowed (409). The subscriber may perform a receiver general command 410 to check the usage records recorded in the duplicate charging prevention smart card and the remaining amount of the token, if necessary. In the case of prepaid, a recurring recording structure is required to maintain the viewing history in order to prevent duplicate charging. To this end, if the recording amount of the viewing history reaches the recording limit, the viewing history is cyclically changed and recorded from the beginning without deleting the latest recording.

If the form of the card is deferred from the step 403 of determining whether the form of the card is prepaid or postpaid, a broadcast service process for the postpaid card is performed. First, after transmitting a control word deciphering the reception entitlement control message of the channel selected by the subscriber to the receiver, it is determined whether there is a program identifier coinciding with the program identifier of the duplicate charging prevention smart card in the viewing entitlement control message. As a result of determining whether there is a matching program identifier, viewing is permitted (413) when there is a matching program identifier. If the matching program identifier does not exist, the viewing history is recorded (414) and the viewing is allowed (415). Thereafter, the viewing history is uploaded (416) and the security message is added and output (417). If the amount of recorded viewing history exceeds a certain amount, the recorded viewing history is deleted (418).

In this way, when the subscriber selects a program, the anti-duplicate charge smart card reads the identifier of the program and compares it with the recorded in-situ program identifier. You can solve the problem of duplication of billing by allowing the viewer to watch after leaving the viewing record.

As described above, according to the present invention, it is possible to ensure distinction between programs by a program identifier in a duplicate charging prevention smart card, thereby providing a more secure and reliable service when a subscriber wants to provide a high value-added service in the field of communication broadcasting. By using the method of comparing program identifiers, it is possible to give accurate billing when watching a paid channel and to prevent duplicate recording of usage history, thereby reducing the burden of uploading usage history.

Claims (3)

Issuing duplicate charge prevention smart card for pay broadcasting according to the type of card desired by the subscriber; Recording channel reception entitlements and various keys in an IPIROM of the issued duplicate charging prevention smart card; Determining whether the type of duplicate charge prevention smart card issued is prepaid or postpaid; Performing a broadcast service process for a prepaid card when the card type is determined as a prepaid; If the deferred payment results in the form of the card, the duplicated billing prevention method using a duplicated billing prevention smart card, characterized in that the step of performing a broadcast service process for the postpaid card. The method of claim 1, wherein the broadcast service process for the prepaid card comprises the steps of: recording a token of a specified amount in a duplicate charge prevention smart card; Transmitting, to the receiver, a control word obtained by decrypting a reception entitlement control message of a channel selected by the subscriber; Determining whether a program identifier in the duplicate charging prevention smart card that matches the program identifier in the receipt entitlement control message exists; Permitting viewing when there is a matching identifier as a result of determining whether the matching program identifier exists; If the matching identifier does not exist as a result of determining whether there is a matching program identifier, reducing the token, recording viewing history such as a channel number and a current program identifier, and allowing viewing; When the recording amount of the viewing history reaches the recording limit, the duplicate charging prevention method using a duplicate charging prevention smart card, characterized in that the step of cyclically changing and recording from the beginning without deleting the latest recording. The method of claim 1, wherein the broadcast service process for the postpaid card comprises: transmitting a control word deciphering a reception entitlement control message of a channel selected by a subscriber to a receiver; Determining whether there is a program identifier in the viewing entitlement control message that matches the program identifier of the duplicate charging prevention smart card; Permitting viewing when there is a matching program identifier as a result of determining whether the matching program identifier exists; Recording a viewing history and permitting viewing when there is no matching program identifier as a result of determining whether the matching program identifier exists; Uploading the viewing history; Outputting the uploaded viewing history in a cryptographic manner; And deleting the recorded viewing history using an encryption method when the recording amount of the viewing history exceeds a predetermined amount.

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