KR100695083B1 - System and Method for Processing Virtual Scrambling Using Scrambling Flag, and Terminal Having Virtual Scrambling Processing Module - Google Patents

Abstract

The present invention relates to a virtual scrambling processing system and method using a scrambling flag.

In the virtual scrambling processing system using the scrambling flag of the present invention, virtual scrambling and message transmission in a digital multimedia broadcasting system providing broadcast program data, a qualification control message (ECM) and a qualification management message (EMM) are impossible. A system for scrambling processing, comprising: a scrambling flag value, a scrambling flag value including a flag value when scrambling of the broadcast program data is impossible and a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible. When the table is stored and the program data scrambling in the digital multimedia broadcasting system is impossible, the scrambling flag field of the unscrambled broadcast program data cannot be scrambling. Set the flag value corresponding to the transmission, and if it is impossible to generate / transmit the qualification control message / credential management message in the digital multimedia broadcasting system, scramble the broadcast program data using the emergency encryption key, and scrambled with the emergency encryption key. There is a technical feature in transmitting by setting a corresponding flag value in broadcast program data.

Description

System and method for processing virtual scrambling using scrambling flag, and terminal having virtual scrambling processing module

1 is a block diagram of a general digital multimedia broadcasting system and a broadcast receiving terminal;

2 is a block diagram of a digital multimedia broadcasting system for explaining a virtual scrambling processing system according to an embodiment of the present invention;

3 is a table for explaining a scrambling flag value according to an embodiment of the present invention;

4 is a block diagram of a broadcast receiving terminal according to an embodiment of the present invention;

5 is a flowchart sequentially showing a virtual scrambling processing method in a virtual scrambling processing system according to an embodiment of the present invention;

6 is a flowchart sequentially illustrating a virtual scrambling processing method in a virtual scrambling processing system according to another embodiment of the present invention;

7 is a flowchart sequentially illustrating a virtual scrambling processing method in a broadcast receiving terminal according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

300: digital multimedia broadcasting system

310: scrambler 320: CW generator

330: subscriber management system 340: ECM generation unit

350: EMM generator 360: virtual scrambling processing system

370: transmitter 400: broadcast receiving terminal

410: receiver 420: virtual scrambling processing module

430: Descrambler 440: Smart Card

450: broadcast playback device

The present invention relates to a virtual scrambling processing system and method using a scrambling flag, and to a broadcast receiving terminal having a virtual scrambling processing module. More specifically, when normal scrambling is impossible, the scrambling process of the scrambling data is performed in the broadcast receiving terminal. The virtual scrambling processing system using the scrambling flag to process the data similarly, and to perform data scrambling using a separate emergency encryption key in the case where normal qualification control / management message generation / transmission is impossible. And a broadcast receiving terminal having a virtual scrambling processing module.

Digital Multimedia Broadcasting (DMB) service is a mobile multimedia broadcasting service that combines broadcasting and communication. It provides CD-quality sound, data, and high-definition video through mobile phones, personal digital assistants (PDAs), and vehicle terminals. It is a digital broadcasting service that provides a service, and is classified into a satellite DMB that receives radio waves through a broadcast satellite and a terrestrial DMB that receives radio waves through a terrestrial transmission station on the top of Namsan or Gwanak Mountain.

At present, the digital multimedia broadcasting to the mobile communication terminal is under trial service, and this broadcasting service will be provided soon. When the digital multimedia broadcasting service is provided, the mobile communication subscribers can watch the drama or listen to the high quality music using the mobile communication terminal even in the subway or bus. You can listen to information, such as news, weather, stock quotes can always receive information while watching the broadcast, and the title or lyrics of the music you are listening to as captions or photos, attracting the attention of mobile subscribers.

On the other hand, most of these digital multimedia broadcasting is to be provided as a paid service, and therefore, the reception receiving system (CAS), which is a download security solution for selectively providing a broadcasting program to subscribers, must be provided in the broadcasting receiving terminal. Should be adopted.

Restriction Control System (CAS) is a system that allows only paid subscribers to watch paid broadcasts, and is a key solution for paid broadcasters such as satellite and cable broadcasts and terrestrial broadcasters that are currently set free but are likely to be paid. .

The configuration of the digital multimedia broadcasting system and the broadcast receiving terminal including the reception restriction system will be described with reference to FIG. 1 as follows.

The digital multimedia broadcasting system 100 includes the scrambler 110, the CW generator 120, the subscriber management system 130, the ECM generator 140, the EMM generator 150, and the transmitter 160. The ECM generator 140 and the EMM generator 150 correspond to a reception restriction system.

The ECM generator 140 receives the control word from the CW generator 120 generating a control word CW for encrypting broadcast program data provided from the program provider PP to the scrambler 110, and receives the received control word. An entitlement control message (ECM) including a word CW and received entitlement information for each channel / program is generated and transmitted to the transmitter 160.

The EMM generation unit 150 is interworked with the subscriber management system 130 in charge of entitlement management for each subscriber, and includes an entitlement management message (EMM) including an encryption key of the entitlement control message and viewing entitlement information for each subscriber. Generates and transmits it to the transmitter 160.

The scrambler 110 encrypts (scrambles) the broadcast program data using the control word generated from the CW generator 120 and transmits it to the transmitter 160, and the transmitter 160 controls the encrypted broadcast program data and the qualification control. The message and the qualification management message are multiplexed and transmitted to the broadcast receiving terminal 200.

In addition, the receiving unit 210 of the broadcast receiving terminal 200 receives the multiplexed signal and demultiplexes the encrypted broadcast program data, the entitlement control message (ECM) and the entitlement management message (EMM), and the encrypted broadcast program. The data is transmitted to the descrambler 220, and the entitlement control message and the entitlement management message are transmitted to the smart card 230.

The smart card 230 determines whether to allow / restrict the reception using the qualification restriction information in the credential control message or the credential management message. When the reception is permitted, the smart card 230 generates a control word CW to the descrambler 220. To pass.

The descrambler 220 decodes the broadcast program data using the control word transmitted from the smart card 230, and transmits the decoded program data to the broadcast reproducing apparatus 250 so that the subscriber can watch the broadcast.

As described above, the digital multimedia broadcasting system 100 restricts the broadcast reception of the broadcast receiving terminal 200 through the encryption and the entitlement control message and the entitlement management message of the broadcast program data.

However, when the ECM generation unit 140 and the EMM generation unit 150 of the reception restriction system do not normally generate or transmit a message, the broadcast reception terminal 200 does not normally receive the entitlement control message and the entitlement management message. Eligibility restrictions will not be achieved.

In addition, when the scrambler 110 is not able to perform normal scrambling, the broadcast receiving terminal 200 will receive broadcast program data that is not scrambled. In this case, the broadcast reception of the unqualified broadcast receiving terminal 200 is received. And viewing cannot be restricted.

Therefore, even when the data processing for qualification restriction is not normally performed in the digital multimedia broadcasting system 100 as described above, there is a need for a method for allowing the restriction of the broadcast reception qualification of the broadcast reception terminal 200 to be made.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, the digital multimedia broadcasting system does not normally perform the scrambling, or can not normally generate or transmit the qualification control message / credential management message, etc. When an abnormal case affecting the reception qualification restriction occurs, using the field indicating whether the encrypted broadcast program data is scrambling, allowing the reception and restriction of the broadcast reception at the broadcast reception terminal can be normally performed while maintaining the existing qualification information. It is an object of the present invention to provide a virtual scrambling processing system and method using a scrambling flag and a broadcast receiving terminal having a virtual scrambling processing module.

The object of the present invention is broadcast program data, which is encrypted with a control word (CW) and includes a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and the control word and reception qualification information for each channel / program. Virtual scrambling and virtual message transmission in a digital multimedia broadcasting system that provides an entitlement control message (ECM) including an entitlement control message and an entitlement management message (EMM) including an entitlement control message and an encryption key of the entitlement control message. A system for scrambling processing, the scrambling flag value comprising a flag value when scrambling of the broadcast program data is impossible and a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible. Value te Storing the table, and if the program data scrambling in the digital multimedia broadcasting system is impossible, a flag value corresponding to the case in which scrambling is not possible in the scrambling flag field of the unscrambled broadcast program data is set and transmitted, If generation / transmission of the entitlement control message / qualification management message to be transmitted together with specific broadcast program data is impossible in the digital multimedia broadcasting system, the broadcast program data is scrambled using the emergency encryption key, and the broadcast program scrambled with the emergency encryption key. It is achieved by a virtual scrambling processing system using a scrambling flag, characterized in that by setting the corresponding flag value in the data to transmit.

In addition, the above object of the present invention is broadcast program data, control word (CW) encrypted with a control word (CW) from a digital multimedia broadcasting system, and including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program. ) And a credential control message (ECM) including reception credential information for each channel / program and an credential management message (EMM) including an encryption key of the credential control message and viewing credential information for each subscriber, are received. A smart card generating a control word (CW) using a management message; A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; In the broadcast receiving terminal comprising a, the broadcast receiving terminal, the virtual scrambling process when receiving the unscrambled broadcast program data from the digital multimedia broadcasting system, or fails to receive the qualification control message / qualification management message normally And a virtual scrambling processing module, wherein the virtual scrambling processing module includes, as the scrambling flag value, a flag value when scrambling of the broadcast program data is impossible, and generation / transmission of the entitlement control message / entitlement management message. Stores the scrambling flag value table and the emergency encryption key including the flag value in the case where this is not possible, and checks the scrambling flag field of the received broadcast program data, so that the flag value cannot be scrambling. In case of the flag value corresponding to the right, the reception qualification is determined using the entitlement control message / entitlement management message received together with the corresponding broadcast program data, and if the reception is allowed, the broadcast program data is directly transmitted to the broadcast reproducing apparatus without descrambling. If the corresponding flag value is a flag value corresponding to the inability to generate / transmit the entitlement control message / entitlement management message, the existence of the emergency encryption key is determined without the determination of the eligibility, and if the emergency encryption key exists, the emergency encryption key. Is transmitted to the descrambler, and the descrambler is descrambled the corresponding program data using the emergency encryption key received from the virtual scrambling processing module by a broadcast receiving terminal having a virtual scrambling processing module. Is achieved.

In addition, the above object of the present invention is broadcast program data, which is encrypted with a control word (CW) and includes a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and control word and channel / program reception. Virtual scrambling in the case where normal scrambling is not possible in a digital multimedia broadcasting system that provides an entitlement control message (ECM) including entitlement information and an encryption key of the entitlement control message and an entitlement management message (EMM) including subscriber-specific viewing entitlement information. A processing method comprising: setting a flag value corresponding to a case in which scrambling flag is not possible in a scrambling flag field of unscrambled broadcast program data when broadcast program data scrambling in the digital multimedia broadcasting system is impossible. Step 1; Transmitting broadcast program data including the scrambling flag value, a qualification control message, and a qualification management message; The scrambling flag, characterized in that the broadcast receiving terminal determines the reception qualification using the credential control message and the credential management message according to the scrambling flag value, but can only omit the descrambling process. It is achieved by the virtual scrambling processing method used.

In addition, the above object of the present invention is broadcast program data, which is encrypted with a control word (CW) and includes a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and control word and channel / program reception. Virtual case of normal message transmission in a digital multimedia broadcasting system that provides an entitlement control message (ECM) including entitlement information and an encryption key of the entitlement control message and an entitlement management message (EMM) including subscriber-specific viewing entitlement information. A scrambling processing method, comprising: a first step of scrambling corresponding broadcast program data using an emergency encryption key when it is impossible to generate / transmit a qualification control message / qualification management message to be transmitted together with specific broadcast program data in the digital multimedia broadcasting system; Wow; Setting a flag value corresponding to a case in which message generation / transmission is impossible in a scrambling flag field of broadcast program data scrambled with the emergency encryption key; Transmitting broadcast program data including the scrambling flag value; The virtual scrambling process using the scrambling flag, characterized in that the broadcast receiving terminal that stores the corresponding emergency encryption key descrambling the broadcast program data using the corresponding emergency encryption key according to the scrambling flag value. Is achieved by the method.

In addition, the above object of the present invention is broadcast program data, control word (CW) encrypted by a control word (CW) from a digital multimedia broadcasting system, and including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program. ) And a credential control message (ECM) including reception credential information for each channel / program and an credential management message (EMM) including an encryption key of the credential control message and viewing credential information for each subscriber, is received. A smart card for generating a control word (CW) using the entitlement management message; A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; A method for virtual scrambling when a broadcast receiving terminal including unscrambled broadcast program data is received from the digital multimedia broadcasting system, the method comprising: checking a scrambling flag field of the received broadcast program data to determine a scrambling flag value; Identifying a first step; If the flag value is a flag value corresponding to a case in which scrambling is impossible, determining a reception qualification by using a qualification control message / qualification management message received together with the corresponding broadcast program data; A third step of transmitting the corresponding broadcast program data to a broadcast reproducing apparatus without a scrambling process when reception is permitted; It is achieved by a virtual scrambling processing method using a scrambling flag, characterized in that comprises a.

In addition, the above object of the present invention is broadcast program data, control word (CW) encrypted with a control word (CW) from a digital multimedia broadcasting system, and including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program. ) And a credential control message (ECM) including reception credential information for each channel / program and an credential management message (EMM) including an encryption key of the credential control message and viewing credential information for each subscriber, are received. A smart card generating a control word (CW) using a management message; A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; A method for virtual scrambling in a case where a broadcast control terminal comprising: does not normally receive a qualification control message / qualification management message from the digital multimedia broadcasting system, the method comprising: checking a scrambling flag field of received broadcast program data; Identifying a scrambling flag value; If the flag value corresponds to a flag value corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible, determining a presence of the emergency encryption key without determining the entitlement; A third step of descrambling the broadcast program data using the emergency encryption key if the emergency encryption key exists, and limiting reproduction of the broadcast program if the emergency encryption key does not exist; It is achieved by a virtual scrambling processing method using a scrambling flag, characterized in that comprises a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, FIG. 2 is a configuration diagram of a digital multimedia broadcasting system for explaining a virtual scrambling processing system according to an embodiment of the present invention, and FIG. 3 is a table for explaining a scrambling flag value according to an embodiment of the present invention. .

As illustrated, the digital multimedia broadcasting system 300 includes a scrambler 310, a CW generator 320, a subscriber management system 330, an ECM generator 340, an EMM generator 350, a transmitter 370, and the like. It comprises a virtual scrambling processing system 360 of the present invention.

The virtual scrambling processing system 360 is a system for virtual scrambling processing when an error occurs, such as when normal scrambling and message transmission are impossible in the digital multimedia broadcasting system 300, and when scrambling of broadcast program data is impossible, the virtual scrambling processing system 360 does not scramble. Set and send a flag value corresponding to the case where scrambling is not possible in the scrambling flag field of broadcast program data which is not performed, and if the generation / transmission of the qualification control message / entitlement management message is impossible, the emergency encryption key is used. It scrambles the broadcast program data, and sets a corresponding flag value to the broadcast program data scrambled with the emergency encryption key and transmits it.

Therefore, the virtual scrambling processing system 360 includes a flag value when the scrambling flag value is impossible, and a flag value when the generation / transmission of the qualification control message / entitlement management message is impossible. The scrambling flag value table is stored, and an embodiment of the scrambling flag value is shown in FIG. 3.

In the case of a transport stream (TS) for broadcasting and transmission, which is one of the actual MPEG-2 system layers, there is a 'transport scrambling control' field in the packet field information. Determine whether or not scrambling using.

3 is an embodiment based on a parameter value that is actually applied to the transport scrambling control field of the MPEG-2 TS, and if the parameter value is '00', it is not scrambled, '10' and '11' Represents a case of normally scrambled, and the parameter value proposed in the present invention is '01', which represents a case in which scrambled is not normally scrambled but should be treated as if scrambled.

Meanwhile, since the embodiment of FIG. 3 is based on a parameter value applied to a packet field of an MPEG-2 transport stream, only '00' to '11' are currently used. Only one of two cases of abnormal processing (when scrambling is not possible, generation / transmission of entitlement control message / entitlement management message is not possible) is included.

That is, the scrambling flag value in the case of including both cases of the present invention uses '-1' when it is not scrambled but should be treated as if it is scrambled, and uses '-2' when scrambled with an emergency encryption key. The flag value may be appropriately set by the operator and is not limited to a specific value in the present invention.

In this case, when scrambling is not normally performed, the virtual scrambling processing system 360 sets '-1' as a scrambling flag value, transmits broadcast program data in a state that is not scrambling, and transmits the qualification control / management message. If creation or transmission is impossible, '-2' is set and the program data is scrambled with the corresponding emergency encryption key to be transmitted.

Here, since the emergency encryption key is a key for scrambling broadcast program data when an error regarding the qualification control / management message occurs, the virtual scrambling processing system 360 may use a plurality of encryption keys according to the qualification conditions. The key may be transmitted to the broadcast receiving terminal in advance, or may be immediately transmitted using a key sharing method.

Therefore, when a plurality of emergency encryption keys exist and are scrambled with the emergency encryption key, the scrambling flag value should contain identification information of the emergency encryption key, and the broadcast receiving terminal corresponds to the corresponding scrambling flag value among the plurality of emergency encryption keys. Eligibility may be determined by determining the existence of a corresponding emergency encryption key capable of descrambling data.

As described above, the virtual scrambling processing system 360 is included in the digital multimedia broadcasting system 300 to be linked with the scrambler 310, the ECM generator 340, and the EMM generator 350. A role of the scrambler 310, the ECM generator 340, and the EMM generator 350 for scrambling will be described below.

The scrambler 310 encrypts (scrambles) the broadcast program data using the control word generated from the CW generator 320 and transmits it to the transmitter 370. If scrambling is impossible, the scrambler 310 is not encrypted with the corresponding error information. The data is passed to the virtual scrambling processing system 360.

When the virtual scrambling processing system 360 receives the error information from the scrambler 310, the virtual scrambling processing system 360 sets a scrambling flag value (eg, 01) in the scrambling flag field of the corresponding broadcast program data, and thus, broadcast program data in the unscrambled state is set. Transfer to the transmitter 370.

The transmitter 370 may transmit the entitlement control message and the entitlement management message received from the ECM generator 340 and the EMM generator 350 to the broadcast program data in the unscrambled state received from the virtual scrambling processing system 360. Together with the broadcast receiving terminal.

The ECM generator 340 receives a control word from the CW generator 320 generating a control word CW for encrypting broadcast program data provided from the program provider PP to the scrambler 310, and receives the received control word. Generate entitlement control message (ECM) including word (CW) and received entitlement information for each channel / program, transmit it to the transmitter 370, and if it is impossible to generate and transmit a normal entitlement control message Error information is transmitted to the virtual scrambling processing system 360.

The EMM generating unit 350 is interworked with the subscriber management system 330 in charge of entitlement management for each subscriber, and includes an entitlement management message (EMM) including an encryption key of the entitlement control message and viewing entitlement information for each subscriber. And generates it, transmits it to the transmitter 370, and if generation and transmission of a normal qualification management message is impossible, the corresponding error information is transmitted to the virtual scrambling processing system 360.

When the virtual scrambling processing system 360 receives the error information from the ECM generator 340 or the EMM generator 350, the scrambling flag value (eg, 10 or 11) is set in the scrambling flag field of the broadcast program data. To the transmitter 370.

In this case, the broadcast program data should be scrambled using a separate emergency encryption key, and scrambling may be performed by the virtual scrambling processing system 360, and the virtual scrambling processing system 360 corresponds to the scrambler 310. The emergency encryption key may be delivered, the scrambler 310 may scramble using the emergency encryption key, and the broadcast program data may be transmitted to the transmitter 370.

In addition, the emergency encryption key used at this time is for limiting the subscriber's reception qualification, so the virtual scrambling processing system 360 is from the ECM generation unit 340, the EMM generation unit 350, or the subscriber management system 330. Receive further information on the reception qualification of the corresponding broadcast data from the data scrambling and the setting of the corresponding scrambling flag value using the emergency encryption key according to the received information, or first scrambling using any emergency encryption key After that, the emergency encryption key should be transmitted only to the subscriber who is qualified.

In this case, the former corresponds to a case where the broadcast receiving terminal has an emergency encryption key according to the qualification information in advance, and the latter broadcasts the data scrambled with the emergency encryption key, and transmits the emergency encryption key to a qualified broadcast receiving terminal. This would be the case.

Next, the transmitter 370 transmits the broadcast program data scrambled with the emergency encryption key received from the scrambler 310 or the virtual scrambling processing system 360 to the broadcast receiving terminal without the entitlement control message and the entitlement management message.

Meanwhile, in the above description, the virtual scrambling processing system 360 scrambles the data using the emergency encryption key, or transfers the emergency encryption key to the scrambler 310, but the scrambler 310 uses the emergency encryption key to scrambling. In this case, the scrambler 310 stores a plurality of emergency encryption keys, and the virtual scrambling processing system 360 may simply transmit identification information of the encryption key to the scrambler 310.

4 is a block diagram of a broadcast receiving terminal according to an embodiment of the present invention.

As shown, the broadcast receiving terminal 400 receives the broadcast program data, the entitlement control message, the entitlement management message from the digital multimedia broadcasting system 300 and demultiplexes the receiver 410, the virtual scrambling processed data The virtual scrambling processing module 420 for processing, the descrambler 430 for descrambling broadcast program data, the entitlement control message and the entitlement management message are used to generate a control word which is an encryption key of the broadcast program data, and the descrambler And a smart card 440 for transmitting to 430 and a broadcast reproducing apparatus 450 for broadcast reproducing.

The receiver 410 receives the multiplexed signal and demultiplexes the encrypted broadcast program data, the entitlement control message (ECM) and the entitlement management message (EMM), and in general, the descrambler 430 In this case, the entitlement control message and the entitlement management message are transmitted to the smart card 440. However, in the present invention, the broadcast program data is transmitted to the virtual scrambling processing module 420 for the operation when the virtual scrambling process is performed.

The virtual scrambling processing module 420 is a module for virtual scrambling processing in the case of receiving unscrambled broadcast program data from the digital multimedia broadcasting system 300 or not receiving a qualification control message / entitlement management message normally. The scrambling flag field included in the program data is checked to operate according to the scrambling flag value.

To this end, the virtual scrambling processing module 420 is a scrambling flag value, and includes a flag value when scrambling of broadcast program data is impossible and a flag value when generation / transmission of the qualification control message / entitlement management message is impossible. The scrambling flag value table and the emergency encryption key should be stored, and the emergency encryption key may be stored in the smart card 440.

When the checked flag value is a flag value corresponding to when scrambling is not possible, the virtual scrambling processing module 420 determines a reception entitlement using the entitlement control message / entitlement message received together with the corresponding broadcast program data. If allowed, the broadcast program data is directly transmitted to the broadcast reproducing apparatus 450 without descrambling.

In the above description, the virtual scrambling processing module 420 performs the general processing for convenience of description, but the descrambler 430 directly checks the scrambling flag value and uses the entitlement control / management message to receive the broadcast. When the control word is received from the smart card 440 determined as determined, the descrambler 430 may transmit the corresponding broadcast program data to the broadcast reproducing apparatus 450 without a separate scrambling process.

In addition, when the checked flag value is a flag value corresponding to the generation / transmission of the entitlement control message / entitlement management message, the virtual scrambling processing module 420 determines whether there is an emergency encryption key without determining the receiving entitlement, If the encryption key exists, the emergency encryption key is transmitted to the descrambler 430 together with the broadcast program data scrambled with the emergency encryption key.

Then, the descrambler 430 descrambles the corresponding program data by using the emergency encryption key received from the virtual scrambling processing module 420.

In this case, the emergency encryption key may be stored in the virtual scrambling processing module 420 or may be stored in the smart card 440. When the emergency encryption key is stored in the smart card 440, the smart card 440 may be an entitlement control message. And instead of determining the broadcast reception eligibility using the entitlement management message, it is determined whether the emergency encryption key in which the broadcast program data is encrypted exists to determine whether to allow / restrict the reception. The scrambler 430 will have to be delivered.

The operations of the virtual scrambling processing system 360 and the broadcast receiving terminal 400 according to the present invention described with reference to FIGS. 2 to 4 will be described sequentially through FIGS. 5 to 7 as follows.

First, FIG. 5 is a flowchart sequentially illustrating a virtual scrambling processing method in a virtual scrambling processing system according to an embodiment of the present invention, and FIG. 6 is a virtual scrambling processing in a virtual scrambling processing system according to another embodiment of the present invention. A flow chart showing the method sequentially.

As shown in FIG. 5, when the program data scrambling in the digital multimedia broadcasting system 300 is impossible, when the virtual scrambling processing system 360 receives the scrambling disable information (S101), the virtual scrambling processing system 360 Sets a flag value corresponding to the case where scrambling is not possible in the scrambling flag field of unscrambled broadcast program data (S102).

The virtual scrambling processing system 360 transmits the broadcast program data including the scrambling flag value, the entitlement control message and the entitlement management message to the broadcast receiving terminal 400 (S103), and the broadcast receiving terminal 400 transmits the According to the scrambling flag value, the reception qualification is determined using the credential control message and the credential management message, but only the descrambling process can be omitted.

6, when the digital multimedia broadcasting system 300 cannot generate / transmit the qualification control message / qualification management message to be transmitted together with the specific broadcast program data, the virtual scrambling processing system 360 Upon reception of the disabling information (S201), the broadcast program data is scrambled using the emergency encryption key (S202), and a message generation / transmission is performed in the scrambling flag field of the broadcast program data scrambled with the emergency encryption key. If it is impossible, the corresponding flag value is set (S203).

If a plurality of emergency encryption keys exist, a flag value corresponding to when the message generation / transmission is impossible is possible, and a flag value included in the scrambling flag field is a flag for a corresponding emergency encryption key among a plurality of flag values. It must be a value.

Thereafter, the virtual scrambling processing system 360 transmits the broadcast program data including the scrambling flag value to the broadcast receiving terminal 400 (S204), and accordingly, the broadcast receiving terminal 400 storing the corresponding emergency encryption key. May descramble the broadcast program data using the corresponding emergency encryption key according to the scrambling flag value.

Next, FIG. 7 is a flowchart sequentially illustrating a virtual scrambling processing method in a broadcast receiving terminal according to an embodiment of the present invention.

As shown, the broadcast receiving terminal 400 identifies the scrambling flag field of the received broadcast program data and identifies the scrambling flag value (S301).

When the identified flag value is a flag value corresponding to when scrambling is impossible (S302), the reception qualification is determined using the entitlement control message / entitlement management message received together with the corresponding broadcast program data (S303). If it is allowed (S304), the broadcast program data is transmitted to the broadcast reproducing apparatus 450 without the scrambling process (S305).

On the other hand, as a result of identifying the scrambling flag field of the received broadcast program data and identifying the scrambling flag value (S301), if the flag value corresponds to a flag value corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible. If the broadcast receiving terminal 400 does not receive the entitlement control message or the entitlement management message (S306), the broadcast receiving terminal 400 determines whether an emergency encryption key is present according to a corresponding flag value without determining the entitlement. (307).

In this case, when a flag value includes identification information for any one of a plurality of emergency encryption keys, the terminal 400 must determine whether a corresponding emergency encryption key exists according to the flag value. That is, the terminal 400 may have a plurality of emergency encryption keys. In this case, the terminal 400 determines whether there is a corresponding emergency encryption key according to the scrambling flag value among the plurality of emergency encryption keys that it has, and thus, the qualification determination. To do.

When the corresponding emergency encryption key exists, the broadcast receiving terminal 400 descrambles the broadcast program data using the corresponding emergency encryption key (S308), and transmits it to the broadcast reproducing apparatus 450 (S305). If the emergency encryption key does not exist, the playback of the broadcast program is restricted.

In addition, when the identification result of the scrambling flag value, the flag value is normally a scrambling process, and when the qualification control message and the qualification management message is a value corresponding to normally received, the broadcast receiving terminal 400 uses the smart card 440. Determination of the qualification and descrambling to the control word using the descrambler 430 are performed to normalize the corresponding data (S309).

Meanwhile, in the detailed description of the present invention, a separate virtual scrambling processing system and a virtual scrambling processing module have been shown and described, but this is merely for convenience of description, and the virtual scrambling processing system is partially or wholly of the digital multimedia broadcasting system. It may be included in an existing component, and the virtual scrambling processing module may also be included in an existing component of the broadcast reception terminal without being separately configured.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Accordingly, according to the broadcast receiving terminal including the virtual scrambling processing system and method and the virtual scrambling processing module using the scrambling flag of the present invention, the digital multimedia broadcasting system does not perform scrambling normally or performs a qualification control message / qualification management message. If an abnormality occurs that affects the reception qualification restriction, such as when the transmission is not normally generated or transmitted, the broadcast reception terminal may allow the broadcast reception terminal to receive the broadcast while maintaining the existing qualification information through a field indicating whether the encrypted broadcast program data is scrambling or not. Restrictions can be made normally.

Claims (10)

Entitlement control message encrypted with a control word (CW) and including broadcast program data including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and a control word and reception qualification information for each channel / program. A system for virtual scrambling and a scrambling process in a case where normal message scrambling and message transmission are impossible in a digital multimedia broadcasting system that provides an ECM and an entitlement management message (EMM) including an encryption key of an entitlement control message and viewing entitlement information for each subscriber. , A scrambling flag value table including a flag value when scrambling of the broadcast program data is impossible and a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible as the scrambling flag value, When the scrambling of the broadcast program data in the digital multimedia broadcasting system is impossible, a flag value corresponding to the case where scrambling is not possible in the scrambling flag field of the unscrambled broadcast program data is set and transmitted. If the digital multimedia broadcasting system cannot generate / transmit the qualification control message / qualification management message to be transmitted together with the specific broadcast program data, the broadcast program data is scrambled using the emergency encryption key, and the broadcast scrambled with the emergency encryption key. A virtual scrambling processing system using a scrambling flag, characterized in that for transmitting the program setting the corresponding flag value. The method of claim 1, The scrambling flag value table is a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible, and includes a plurality of flag values according to an emergency encryption key for scrambling broadcast program data. At least one encryption key is already stored. The virtual scrambling processing system, If generation / transmission of a qualification control message / qualification management message to be transmitted together with specific broadcast program data is impossible in the digital multimedia broadcasting system, scramble the corresponding broadcast program data using an emergency encryption key, and a qualification control message / qualification management message. An emergency encryption key in which the broadcast receiving terminal scrambles the data according to the scrambling flag value by setting a flag value for the corresponding emergency encryption key among the plurality of flag values when generation / transmission of the data is impossible. And identifying an existence of an encryption key capable of descrambling corresponding data among the previously stored encryption keys. Broadcast program data encrypted with a control word (CW) from a digital multimedia broadcasting system and including a scrambling flag field indicating information on whether a broadcast program is scrambling, control word (CW) and channel / program reception. When the credential control message (ECM) including the credential information and the credential management message (EMM) including the encryption key of the credential control message and the viewing credential information for each subscriber are received, a control word using the credential control message and the credential management message is received. A smart card for generating (CW); A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; In the broadcast receiving terminal comprising a, The broadcast receiving terminal, And a virtual scrambling processing module for virtual scrambling processing when receiving unscrambled broadcast program data from the digital multimedia broadcasting system or failing to normally receive a qualification control message / entitlement management message. The virtual scrambling processing module, As the scrambling flag value, a scrambling flag value table and an emergency encryption key including a flag value when scrambling of the broadcast program data is impossible and a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible. Save it, Check the scrambling flag field of the received broadcast program data, and if the flag value is a flag value corresponding to when scrambling is impossible, the reception qualification is determined using the entitlement control message / entitlement message received together with the corresponding broadcast program data. If reception is allowed, the broadcast program data is directly transmitted to the broadcast reproducing apparatus without descrambling. If the corresponding flag value is a flag value corresponding to the inability to generate / transmit the entitlement control message / entitlement management message, it is determined whether the emergency encryption key exists without the determination of the receiving qualification, and if the emergency encryption key exists, the emergency encryption key is recalled. Pass it to the descrambler, The descrambler is a broadcast receiving terminal having a virtual scrambling processing module, characterized in that the descrambling the program data using the emergency encryption key received from the virtual scrambling processing module. The method of claim 3, The scrambling flag value table is a flag value when generation / transmission of the entitlement control message / entitlement management message is impossible, and includes a plurality of flag values according to an emergency encryption key for scrambling broadcast program data. The virtual scrambling processing module, If the flag value is a flag value corresponding to the generation / transmission of the entitlement control message / entitlement management message, the emergency encryption key scrambled the data according to the scrambling flag value is identified to determine whether the emergency encryption key exists. Broadcast receiving terminal having a virtual scrambling processing module, characterized in that. Entitlement control message encrypted with a control word (CW) and including broadcast program data including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and a control word and channel / program reception entitlement information. A virtual scrambling processing method in a case where normal scrambling is not possible in a digital multimedia broadcasting system that provides an ECM and an entitlement management message (EMM) including an encryption key of an entitlement control message and viewing entitlement information for each subscriber. Setting a flag value corresponding to a case where scrambling is not possible in the scrambling flag field of the unscrambled broadcast program data when broadcast program data scrambling is impossible in the digital multimedia broadcasting system; Transmitting broadcast program data including the scrambling flag value, a qualification control message, and a qualification management message; The scrambling flag, characterized in that the broadcast receiving terminal determines the reception qualification using the credential control message and the credential management message according to the scrambling flag value, but can only omit the descrambling process. Virtual scrambling processing method using. Entitlement control message encrypted with a control word (CW) and including broadcast program data including a scrambling flag field indicating information on the presence or absence of scrambling of a broadcast program, and a control word and reception qualification information for each channel / program. A virtual scrambling processing method in a case where normal message transmission is impossible in a digital multimedia broadcasting system that provides an ECM and an entitlement management message (EMM) including an encryption key of an entitlement control message and subscriber entitlement viewing information. A step of scrambling the broadcast program data using an emergency encryption key if it is impossible to generate / transmit a qualification control message / qualification management message to be transmitted together with specific broadcast program data in the digital multimedia broadcasting system; Setting a flag value corresponding to a case in which message generation / transmission is impossible in a scrambling flag field of broadcast program data scrambled with the emergency encryption key; Transmitting broadcast program data including the scrambling flag value; The virtual scrambling process using the scrambling flag, characterized in that the broadcast receiving terminal that stores the corresponding emergency encryption key descrambling the broadcast program data using the corresponding emergency encryption key according to the scrambling flag value. Way. The method of claim 6, There are a plurality of flag values corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible, according to the emergency encryption key. The second step, Setting a flag value for a corresponding emergency encryption key used for scrambling among a plurality of flag values corresponding to when a message cannot be generated / transmitted in a scrambling flag field of broadcast program data scrambled with the emergency encryption key Virtual scrambling processing method using a scrambling flag, characterized in that. Broadcast program data encrypted with a control word (CW) from the digital multimedia broadcasting system and including a scrambling flag field indicating information on whether a broadcast program is scrambling, control word (CW) and channel / program reception qualification When a credential control message (ECM) including information and an credential management message (EMM) including an encryption key of the credential control message and viewing credential information for each subscriber are received, the control word (ECM) using the credential control message and the credential management message is received. A smart card for generating CW); A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; In the broadcast receiving terminal comprising a, for the virtual scrambling process when receiving the unscrambled broadcast program data from the digital multimedia broadcasting system, Identifying a scrambling flag field of the received broadcast program data and identifying a scrambling flag value; If the flag value is a flag value corresponding to a case in which scrambling is impossible, determining a reception qualification by using a qualification control message / qualification management message received together with the corresponding broadcast program data; A third step of transmitting the corresponding broadcast program data to a broadcast reproducing apparatus without a scrambling process when reception is permitted; Virtual scrambling processing method using a scrambling flag, characterized in that comprises a. Broadcast program data encrypted with a control word (CW) from the digital multimedia broadcasting system and including a scrambling flag field indicating information on whether a broadcast program is scrambling, control word (CW) and channel / program reception qualification When a credential control message (ECM) including information and an credential management message (EMM) including an encryption key of the credential control message and viewing credential information for each subscriber are received, the control word (ECM) using the credential control message and the credential management message is received. A smart card for generating CW); A descrambler for decoding the encrypted broadcast program data into a control word (CW) received from the smart card and transmitting the decrypted broadcast program data to a broadcast reproducing apparatus; In the broadcast receiving terminal comprising a, for the virtual scrambling processing when the qualification control message / qualification management message from the digital multimedia broadcasting system does not normally receive, Identifying a scrambling flag field of the received broadcast program data and identifying a scrambling flag value; If the flag value corresponds to a flag value corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible, determining a presence of the emergency encryption key without determining the entitlement; A third step of descrambling the broadcast program data using the emergency encryption key if the emergency encryption key exists, and limiting reproduction of the broadcast program if the emergency encryption key does not exist; Virtual scrambling processing method using a scrambling flag, characterized in that comprises a. The method of claim 9, There are a plurality of flag values corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible, according to the emergency encryption key. The second step, If the flag value is a flag value corresponding to the case where generation / transmission of the entitlement control message / entitlement management message is impossible, it is determined whether to receive the broadcast by determining the existence of the corresponding emergency encryption key used for scrambling according to the flag value. Virtual scrambling processing method using a scrambling flag, characterized in that the step.

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