KR20010047389A - Method of entitlement management and entitlement control for various Pay-Per-View service in Pay-TV system - Google Patents

Abstract

PURPOSE: A method for managing and controlling an entitlement in a chargeable broadcasting system for supporting various pay-view services is provided to classify a series by setting a proper theme ID and an event ID when a qualification managing message is created. CONSTITUTION: A key ID(21) is used for a cryptography of a plurality of information(22, 23, 24, 25, 26). Mask information(22) is a value for deciding an application range of a theme ID(23) and an event ID(24). The mask information(22) is identified with the sum of sizes of two fields. EXTM information(25) indicating an expiration time is used for deleting a qualification record exceeding to the time from a memory by an interior operation of a smart card. DUR information(26) is valid only in the case of a PPP service. The information from the mask information(22) to the DUR information(26) means a watching right of each member. If the corresponding qualification is valid, the information is stored in a card memory. In the case of a PPE(pay-per-event), the total value of the theme ID(TID)(23) and an event ID(EID)(24) becomes a valid program ID. In the case of a PPS(pay-per-series), the DUR information(26) is ignored and a bit calculation logical value of the mask information(22) and the theme ID(TID)(23) become a series. In the case of a PPP(pay-per-period), a user can watch from a starting time of watching of a chargeable program to a time passed for the DUR, and if the smart card receives a qualification managing message, one's expiration time is changed into a time adding the current time to the DUR, and thus the corresponding service is possible.

Description

Qualification management and entitlement control method in paid broadcasting system supporting various payview service {Method of entitlement management and entitlement control for various Pay-Per-View service in Pay-TV system}

The present invention relates to a credential management and credential control method in a digital pay broadcasting system, and more specifically, to a credential management and credential control method in a pay broadcasting system supporting various paper view (PPV) services according to various characteristics of subscribers. It is about.

The pay-per-view (PPV) service in the conventional pay-TV system supported only an event program service (Pay-Per-Event) in which subscribers pay a fixed price per program and watch the program. Therefore, the pay-TV system simply recorded the viewing time or the viewing program accurately, and performed the charging for the viewing time. That is, the smart card on the receiving side simply records the PPV viewing history and provides accurate billing information according to the record to the subscriber management center, and the subscriber management center played all roles for additional services such as series and discount benefits.

In order to provide Pay-Per-Series in the conventional pay broadcasting system, the subscriber management center collects information on series programs scattered in various channels and matches the subscriber's viewing history with the subscriber's discount. Decided to grant benefits. In other words, the settlement process at the subscriber management center becomes very complicated to provide such series program services.

In addition, in order to provide a pay-per-period for a pay-per-view system in a conventional pay broadcasting system, a qualification management message for disqualifying a subscriber after passing a qualification for viewing must be delivered.

As described above, the conventional pay broadcasting system could not provide various PPV services, and could provide only a limited PPE service, and there was a problem in that a control process was complicated to provide another PPV service, PPS service or PPP service.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, it is possible to distinguish the series by setting the appropriate theme identifier (Theme ID) and event identifier (Event ID) when generating the credential management message. In addition, subscribers can watch the series of discounted programs without any inconvenience by delivering a series number previously distinguished from the subscriber management center, and the subscriber management center can skip various complicated settlement processes. It is to provide a credential management and credential control method in a pay broadcasting system supporting a service.

In addition, the present invention by specifying the duration (duration) of the program viewing authority entitlement in the qualification management message to support a variety of pay-per-view services that can be provided simply by disallowing viewing of the PPV program after a specified period It is to provide a qualification management and qualification control method in pay broadcasting system.

1 is a configuration diagram of a general pay broadcasting system;

2 is a view showing a form of qualification management and qualification control message to which the present invention is applied;

3 is an operation flowchart of processing a credential management message according to an embodiment of the present invention;

4 is an operation flowchart of processing an entitlement control message according to an embodiment of the present invention.

※ Explanation of code about main part of drawing ※

11: Pay TV Transmission Equipment 12: Subscriber Management Center

13: broadcast receiver 14: smart card

In order to achieve the above object, the present invention, the subscriber management center for managing the subscriber's entitlement and billing information, and receives the entitlement management message and entitlement control message to determine the viewing authority and extract the control word for descramble the program In the entitlement management and entitlement control method for supporting a variety of Paper View (PPV) services in a pay broadcasting system including a smart card, the subscriber management center includes a entitlement management message including a theme identifier, an event identifier expiration time, and period information. Generate a credential control message including a theme identifier, an event identifier, a current time and control information, and the smart card deletes / modifies / adds a received credential for a program using the credential management message; You can use the entitlement control message to And control information for identifying and descrambling the program.

Hereinafter, with reference to the accompanying drawings will be described in more detail "qualification management and qualification control method in a pay-broadcast system supporting a variety of paper view services" according to an embodiment of the present invention.

The pay broadcasting system scrambles using the control word (CW) for each program to allow the paying viewers to watch the pay broadcasting only for a limited subscriber, and only if the descrambler in the receiver is eligible to receive the pay broadcasting. This control word (CW) is input from the smart card and descrambled with the original program.

In addition, the subscriber management center generates an entitlement management message (EMM) and an entitlement control message (ECM) and delivers these messages to the smart card through the receiver of each household using the broadcasting transmission equipment. . In the credential management message, the subscriber is authorized to view the content (Pay-Per-Series (PPS), Pay-Per-Event (PPE), Pay-Per-Period (PPP) list, etc.) The entitlement control message contains a set of paid program information including control words that can be scrambled. These messages go through several levels of encryption to ensure that only limited or authorized subscribers receive the service, and the smart card that receives the encrypted messages decrypts these messages by an internal decryption algorithm and an internal processor. The qualification corresponding to the subscriber is stored in the memory of the card to determine the subscriber's viewing eligibility and to decode the original signal of the program.

The present invention enables various PPV services in such a pay broadcasting system.

1 is a diagram illustrating a configuration of a general pay broadcasting system. The pay broadcasting system includes a central pay broadcasting transmission device 11, a subscriber management center 12 that manages subscribers' qualifications and billing information, receives a broadcast signal, sends a qualification control message to a smart card, and receives viewing authority therefrom. If there is, the broadcast receiver 13, which receives the control word, decrypts the entitlement control message and the entitlement management message, determines whether there is a viewing authority from the viewing authority, and stores the viewing authority in the memory in the card and finally outputs the control word to the receiver. It consists of a smart card (14). The broadcast receiver 13 and the smart card 14 may exist in plural as subscriber's premises equipment.

2 is a diagram illustrating a form of a credential management message and a credential control message for enabling various PPV services (PPS, PPE, PPP) according to the present invention.

That is, the credential management message includes a key identifier 21 used to encrypt various pieces of information 22, 23, 24, 25, and 26. The mask information (MASK) 22 is a value for determining the coverage of the theme identifier (TID) 23 and the event identifier (EID) 24, and coincides with the sum of these two field sizes. The EXTM information 25 indicating the expiration time is a value used to delete an entitlement record beyond this time by a smart card internal operation from memory. The DUR information 26 representing the duration is valid information in case of PPP service and is ignored in other cases.

The information from the mask information 22, which is the credential information in the credential management message, to the DUR information 26 means the viewing authority of each subscriber, and if the corresponding credential is valid according to the flow of FIG. 3 and FIG. Store as a record in memory.

In the case of pay-per-event service, the total value of the theme identifier (TID) 23 and the event identifier (EID) 24 becomes the paid program identifier, and the pay-per-series (PPS) In this case, the DUR information 26 indicating the period is ignored and the bitwise AND product of the mask information 22 and the theme identifier (TID) 23 is the series number of the paid program. Regardless of the value of the event identifier (EID) 24, the paid program can be viewed. In the case of Pay-Per-Period (PPP), users can watch only from the start of the paid program until the time period (DUR) .Internally, when the smart card receives this credential management message, the expiration time Enable the service by changing (EXTM) to the current time (CTM) + duration (DUR).

The entitlement control message is a CTM 30 that displays an encryption key identifier (Key ID) 27, a theme identifier (TID) 28 of the corresponding paid program, an event identifier (EID) 29, and a current time. And cipher words (CWs) 31 to be used for descramble. In this case, the theme identifier (TID) 28 and the event identifier (EID) 29 are entitlements stored in the smart card (that is, the theme identifier 28, the event identifier 29, and the mask information 22). The current time CTM 30 is used for the comparison to delete the entitlement past the expiration time (EXTM) 25.

The theme identifier (TID) and the event identifier (EID) in the entitlement management and entitlement control message differ by mapping with the paid program identifier according to each series and event in the subscriber management center 12. The operation in the smart card that received these messages is shown in FIGS. 3 to 4.

Upon receipt of an Entitlement Management Message (EMM) (S31), it is decoded with the corresponding encryption key (S32) and the subscriber's qualification, i.e. theme identifier (TID), event identifier (EID), mask information (MASK), and expiration time information. (EXTM) and period information (DUR). First, the expiration time information (EXTM) included in the credential management message is compared with the current time (CTM) stored as a result of decryption of the credential control message (ECM) inside the card (S33), and the current time (CTM) is further increased. If greater, the qualification is no longer valid and the corresponding qualification in the card is deleted (S35).

On the other hand, if the expiration time is greater than the current time, then you have a valid credential, in which case the theme identifier (TID) and the incident identifier (EID) and the EID and The mask information MASK is compared with the theme identifier TID of the smart card and the event identifier EID (S34). If all are the same, since the corresponding qualification is changed, change the corresponding qualification record to a new qualification (that is, the contents of the current decrypted credential management message) (S36), and if not the same, add the qualification record (S37).

When receiving an entitlement control message (ECM) (S41), the entitlement control message is decrypted with an encryption key (S42), and the theme identifier (TID) and the event identifier (EID), which are identifiers of the paid program, are stored in the smart card. It is compared whether the theme identifier (TID) and the event identifier (EID) which are the qualifications are the same (S43). If both identifiers are the same, it means that the corresponding qualification exists in the card, and thus, the current time (CTM) of the credential control message (ECM) is compared with the expiration time (EXTM) in the smart card (S44). In this case, if the current time (CTM) is large, this means that the qualification has expired (S46). If the expiration time (EXTM) is large, the qualification is valid, so the process proceeds to step S45 to detect the service type.

That is, to confirm whether the type of service is a series service (PPS) or a period service (PPP), it is checked whether the period (DUR) information in the card is 0 (S45). If the duration (DUR) information is non-zero, it is a PPP service, so that the expiration time (EXTM) in the internal entitlement record is newly changed (S47) and the duration (DURsc) stored in the smart card is also zeroed (S49), and the next entitlement control message is displayed. Allow normal operation upon reception. In addition, the control word (CW) is output to allow viewing (S52). If the duration DUR is not 0, the control word CW is output to allow viewing because it is a PPS service (S52).

After the corresponding eligibility is deleted (S46), the receiver is notified that there is no reservation eligibility (S48) and the subscriber is checked whether or not to continue watching (S50) to determine whether to continue the PPE service. When the subscriber requests the continuous PPE service, the viewing history is recorded on the smart card for later settlement (S51), and the control word is output for viewing permission (S52). However, if the subscriber refuses to view the notification that the paid program is impossible (S53). After completing all these steps, the smart card changes its current time to the latest one (ie, CTM (CTMecm) in the current entitlement control message) and finishes all the steps.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

As described above, according to the present invention, in realizing the PPV service of the paid program, by including additional information in the credential management message and the credential control message, it is possible to view the series in a more convenient manner, to watch the period and to watch the event, etc. By broadening the choice of the service provider, the service provider has the effect of simplifying the settlement process by easily reflecting the subscriber's choice at the time of billing settlement.

Claims (1)

The subscriber management center that manages the subscriber's entitlement and billing information, and a smart card that receives the entitlement management message and entitlement control message to determine the viewing authority and extract the control word for descrambling the program. In the credential management and credential control method that supports the Paper View (PPV) service, The subscriber management center generates a credential management message including a theme identifier, an event identifier expiration time and period information, and generates a credential control message including a theme identifier, an event identifier, a current time and control information, The smart card deletes / modifies / adds a reception entitlement for a program using the entitlement management message, determines whether to allow viewing of the program using the entitlement control message, and provides control information for descrambling the program. A credential management and credential control method in a pay broadcasting system supporting various paper view services, characterized in that the.