KR101901979B1 - Broadcasting control access service system and method thereof - Google Patents

Abstract

The present invention applies a CAS technology for encrypting (scrambling) broadcasting contents to charge a broadcasting service and decoding and decoding (descrambling) only those viewers who have the right to view the contents, A broadcasting reception restriction service system and method for increasing the efficiency of broadcasting service application to which CAS technology is applied by lowering a resource usage rate required for encryption of broadcasting contents and decoding of reception side. In the broadcast receiving restriction service system of the present invention, the reception restriction processing device assigns a packet count corresponding to each data packet constituting broadcast contents to be broadcasted, And performing a predetermined encryption selection operation on the packet count and scrambling at least one specific data packet selected according to the result of performing the encryption selection operation, The broadcast receiving apparatus receiving the broadcast contents descrambles the specific data packet corresponding to each data packet constituting the broadcast contents.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a broadcast receiving restriction service system,

The present invention relates to a broadcasting reception restriction service system, and more particularly, to a broadcasting reception restriction service system and method in which broadcasting contents are encrypted (scrambled) in order to charge a broadcasting service and only a viewer having a proper viewing right decodes (descrambles) In applying the CAS technology, partial encryption is performed based on a specific encryption ratio rather than the entire broadcast content, thereby lowering the resource usage rate required for encryption of the broadcast content and decryption of the reception side, thereby improving the efficiency of the broadcast service implementation using the CAS technology And a method of operating the reception restriction processing apparatus, and a method of operating the broadcast reception apparatus and the broadcast reception apparatus.

Generally, in a broadcasting system, a CAS (Conditional Access System) technology for encrypting (scrambling) broadcast contents to protect broadcasting contents and paying for a broadcasting service and allowing only viewers who have the right viewing authority to decode (descramble) And the like. Accordingly, on the viewer side receiving the broadcast content to which the CAS technology is applied, the viewer can de-scramble and view or listen only when the viewer has the right to view.

Meanwhile, in recent years, not only a large-sized TV apparatus provided in the home, but also a large number of users have been able to receive broadcast contents through various mobile terminals such as a DMB terminal or a mobile phone terminal, I can watch or listen to it.

In addition to the function of supporting the broadcasting service, the mobile terminal has a complex function such as a voice or video phone function, a navigation function, an E-BOOK function, and the like. In addition, The mobile terminal has a high CPU usage rate required to decode (scramble) and reproduce the broadcast content to which the CAS technology is applied, so that there is a fear of affecting service implementation by executing other built-in functions .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a reception restriction processing apparatus, in which a packet count is given in correspondence with each data packet constituting broadcast contents to be broadcast, Performing scrambling of at least one specific data packet selected according to a result of performing the encryption selection operation, performing a predefined encryption selection operation on the corresponding packet count given to each data packet based on the ratio information, The broadcast receiving apparatus receiving the broadcast contents processed by the reception restriction processing apparatus performs a de-scrambling process on the specific data packet corresponding to each data packet constituting the broadcast contents The present invention provides a broadcast receiving restriction service system and method for a CAS The present invention is applied to partially encrypt the broadcast content based on a specific encryption ratio rather than the entire broadcast content, thereby lowering the resource usage rate required for the encryption of the broadcast content and the decryption of the reception side.

It is another object of the present invention to provide a method and apparatus for dividing a sequence of data packets constituting broadcasting contents subject to a broadcasting service into a predetermined size, Counting the number of packet counts, performing a predetermined encryption selection operation on each of the given packet counts based on predetermined encryption ratio information, and dividing the divided part corresponding to at least one packet count for which encryption is selected The present invention provides a method of operating a reception restriction processing device and a reception restriction processing device for scrambling and partially encrypting a broadcast content based on a specific encryption ratio rather than a whole broadcast content in applying CAS technology, To reduce the resource usage rate required for decryption.

Another object to be achieved by the present invention is to provide a method and apparatus for receiving broadcast content and receiving a control key (CW) from an entitlement control message (ECM) corresponding to the broadcast content, And a de-scrambling process of a specific divided part of a sequence of data packets constituting the broadcast content by using the control key, In applying the CAS technology, the corresponding broadcast content is partially decrypted based on a specific encryption ratio rather than the entire broadcast content, thereby lowering the resource usage rate required for the encryption of the broadcast content and the decryption of the receiver.

A reception restriction processing device for scrambling at least one specific data packet selected according to an execution result by performing a predefined encryption selection operation on the packet count; And a broadcast receiving apparatus for de-scrambling the specific data packet corresponding to each data packet constituting the broadcast content processed by the reception restriction processing apparatus.

According to a second aspect of the present invention, there is provided a reception restriction processing apparatus for dividing a sequence of data packets constituting broadcasting contents subject to a broadcasting service into a predetermined size, A packet count processing unit for giving a packet count; An operation performing unit for performing a predetermined encryption selection operation on each packet count given by the packet count processing unit based on predetermined encryption ratio information; And a reception restriction processing unit for scrambling the divided part corresponding to at least one packet count in which encryption is selected according to the result of the operation performing unit.

Preferably, the packet count processing unit divides a sequence of data packets constituting the broadcast content into a predetermined packet size, divides each data packet, and provides a packet count corresponding to each data packet.

Preferably, the operation performing unit stores the encryption ratio information previously set by the operator, and calculates the remaining value by dividing each packet count given by the packet count processing unit by N according to the encryption ratio information, A selection operation can be performed.

Preferably, the reception restriction processing unit recognizes at least one packet count having a predetermined encryption selection value as a calculation value based on a calculation value corresponding to each packet count according to a result of the operation performed by the operation performing unit, The corresponding divided part corresponding to at least one packet count can be scrambled using a specific control key (CW).

Preferably, the information processing apparatus further comprises: an encryption unit operable to encrypt the broadcast content scrambled by the reception restriction processing unit, the encryption ratio information corresponding to the broadcast content, the operation performing information indicating an encryption selection operation performed by the operation performing unit, (ENC) including at least one of encryption-selection-value information and scrambling-applying information indicating at least one divided part subjected to the scrambling process, and an ECM (Entitlement Control Message) including the control key And a content providing unit.

According to a third aspect of the present invention, there is provided a broadcast receiving apparatus including: a content receiving unit for receiving broadcast content; (CW) from an Entitlement Control Message (ECM) corresponding to the broadcast content, and a control unit (100) for acquiring a control word (De-scrambling) the received signal.

Preferably, when the partial encryption-related information corresponding to the broadcast content is received through the content receiving unit, the reception restriction control unit transmits, among the data packets in the broadcast content, Recognizes a data packet corresponding to at least one divided part scrambled and descrambles at least one corresponding data packet among the data packets in the broadcast content using the control key (CW).

Preferably, when the partial encryption-related information corresponding to the broadcast content is received through the content receiver, the reception restriction controller may further include an encryption ratio information included in the partial encryption-related information, And a control unit for recognizing a data packet corresponding to at least one of the divided parts of the data packets in the broadcast content, which is scrambled during encryption, based on the encryption selection value information indicating the encryption selection value, CW) to descramble at least one corresponding data packet among the data packets in the broadcast content.

According to a fourth aspect of the present invention for achieving the above object, there is provided a broadcast reception restriction service method, wherein a reception restriction processing device assigns a packet count in correspondence with each data packet constituting broadcast contents to be broadcasted, Performing a predetermined encryption selection operation on a corresponding packet count given to each data packet based on ratio information; Scrambling at least one specific data packet selected according to a result of the reception restriction processing device performing the encryption selection operation; And a step of de-scrambling the specific data packet corresponding to each data packet constituting the broadcast content in the broadcast receiving apparatus receiving the broadcast content processed by the reception restriction processing apparatus .

According to a fifth aspect of the present invention, there is provided a method of operating a reception restriction processing apparatus, the method comprising: dividing a sequence of data packets constituting broadcast contents subject to a broadcast service into predetermined sizes, A packet count processing step of giving a packet count; Performing an encryption selection operation predefined for each of the assigned packet counts based on preset encryption ratio information; And a reception restriction processing step of scrambling the divided part corresponding to at least one packet count in which encryption is selected according to a result of the operation performing step.

Preferably, the packet count processing step divides a sequence of data packets constituting the broadcast content into a predetermined packet size, divides each data packet, and provides a packet count corresponding to each data packet.

Preferably, the performing step stores the encryption ratio information previously set by the operator, divides each packet count given by the packet count processing step by N according to the encryption ratio information, and calculates a remaining value The encryption selection operation can be performed.

Preferably, the reception limitation processing step recognizes at least one packet count having a predetermined encryption selection value as a calculation value based on a calculation value corresponding to each packet count in accordance with a result of the execution of the calculation step, The corresponding divided part corresponding to at least one recognized packet count can be scrambled using a specific control key (CW).

Preferably, the scrambled broadcast content, the encryption ratio information corresponding to the broadcast content, the operation execution information indicating the encryption selection operation performed in the operation performing step, the encryption selection value information indicating the encryption selection value, And a content providing step of providing an entitlement control message (ECM) including the partial encryption related information including at least one of scrambling application information indicating at least one divided part that has been scrambled and the control key .

According to a sixth aspect of the present invention, there is provided a method of operating a broadcast receiving apparatus, the method comprising: receiving a broadcast content; (CW) from an Entitlement Control Message (ECM) corresponding to the broadcast content, and a control unit (100) for acquiring a control word And de-scrambling the received signal.

Preferably, the reception restriction control step includes a step of, based on the scrambling application information included in the partial encryption related information received corresponding to the broadcast content, at least one of the divided parts of the data packets scrambled in the broadcast content Recognizes the corresponding data packet and descrambles at least one corresponding data packet among the data packets in the broadcast content using the control key (CW).

Preferably, the reception restriction control step may include: an encryption ratio information included in partial encryption related information received corresponding to the broadcast content; and an operation execution information and an encryption selection value indicating an encryption selection operation performed when the broadcast contents are encrypted The control unit recognizes a data packet corresponding to at least one divided part scrambled during encryption in the data packets in the broadcast content based on the encryption selection value information, And at least one corresponding data packet among the packets can be descrambled.

According to the broadcasting reception restriction service system and method of the present invention, a CAS technology for encrypting (scrambling) broadcasting contents to charge a broadcasting service and decoding only by a viewer having a proper viewing right (descrambling) It is possible to reduce the resource usage rate required for the encryption of the broadcast contents and the decryption of the reception side by partially encrypting the broadcast contents based on a specific encryption ratio rather than the whole of the broadcast contents to increase the efficiency of the broadcast service implementation using the CAS technology.

FIG. 1 is a block diagram illustrating a broadcasting reception restriction service system according to a preferred embodiment of the present invention. Referring to FIG.
2 is a block diagram illustrating a configuration of a reception restriction processing apparatus according to a preferred embodiment of the present invention.
3 is a block diagram illustrating a configuration of a broadcast receiving apparatus according to a preferred embodiment of the present invention.
4 is a flowchart illustrating a control flow of a broadcast reception limiting service method according to a preferred embodiment of the present invention.
5 is a flowchart illustrating an operation method of a reception restriction processing apparatus according to a preferred embodiment of the present invention.
6 is a flowchart illustrating a method of operating a broadcast receiving apparatus according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a broadcasting reception restriction service system according to a preferred embodiment of the present invention.

As shown in FIG. 1, a broadcast reception restriction service system according to an embodiment of the present invention provides a packet count corresponding to each data packet constituting broadcast contents subject to a broadcast service, A reception restriction processing device (100) for scrambling at least one specific data packet selected according to an execution result by performing a predefined encryption selection operation on a corresponding packet count given to a data packet, And a broadcast receiving apparatus 300 for de-scrambling the specific data packet corresponding to each data packet constituting the broadcast content processed by the apparatus 100.

The reception restriction processing apparatus 100 adds a packet count corresponding to each data packet constituting broadcast contents to be broadcast service target and sets a packet count corresponding to the packet count given to each data packet based on the preset encryption ratio information Performs a defined encryption selection operation, and scrambles at least one specific data packet selected according to the execution result.

That is, the reception restriction processing apparatus 100 is a device that applies CAS technology by processing broadcast contents provided from a broadcast producer that produced broadcast contents for a broadcast service.

For example, when the broadcast content for the broadcast service is provided from the broadcast producer, the reception limit processing device 100 divides each data packet by dividing the sequence of data packets constituting the broadcast content into predetermined sizes, The packet count can be sequentially given in response to the packet.

Then, the reception restriction processing apparatus 100 performs a predetermined encryption selection operation on the corresponding packet count given to each data packet based on the predetermined encryption ratio information.

That is, when the reception restriction processing apparatus 100 stores the encryption ratio information preset by the operator who operates the reception restriction processing apparatus 100, the encryption limit information is applied to each packet count given to each data packet, The calculated value corresponding to each packet count can be obtained.

Then, the reception restriction processing apparatus 100 scrambles at least one specific data packet selected according to the result of performing the encryption selection operation.

That is, the reception restriction processing apparatus 100 recognizes at least one packet count having the predetermined encryption selection value as the calculation value based on the calculation value corresponding to each packet count according to the result of performing the encryption selection calculation , And only the corresponding data packet corresponding to the recognized packet count can be scrambled using a specific control key (CW).

Therefore, in the reception restriction processing apparatus 100, the control key (CW) is not used / scrambled for all the data packets constituting the broadcast content, and the packet counting and encryption ratio information for each data packet and encryption It is possible to perform partial encryption using the CAS technique for broadcast contents by selectively using the scrambling target data packet and using / scrambling the control key (CW) only for the selected specific data packet through the selection operation.

Then, the reception restriction processing apparatus 100 generates an entitlement control message (ECM) including the control key (CW) used for the scrambling process, and transmits the entitlement control message to the viewer side broadcast reception Encrypts the encrypted broadcast content and the encrypted entitlement control message (ECM) using the client encryption key corresponding to the device 300, and provides the encrypted broadcast content and the encrypted entitlement control message (ECM) to the broadcast providing apparatus 200 providing the broadcast service.

At this time, the reception restriction processing apparatus 100 transmits the encryption ratio information corresponding to the broadcast contents, the computation execution information indicating the performed encryption selection computation, the encryption selection value information indicating the encryption selection value, and the at least one scrambled data packet Related information including at least one of the scrambling application information indicating the content to be transmitted and the scrambling application information indicating the content to be transmitted to the broadcast providing apparatus 200.

The broadcast providing apparatus 200 provides a broadcast service by broadcasting broadcast contents through respective broadcast channels according to a broadcast schedule by an external predetermined broadcast scheduler (not shown). The broadcast providing apparatus 200 may transmit the broadcast content through each broadcast channel or transmit the corresponding broadcast content in response to a download request for the specific broadcast content from the predetermined broadcast receiving apparatus 300.

That is, the broadcast providing apparatus 200 TS packets the encrypted broadcast contents, corresponding encrypted qualification control message (ECM) and partial encryption related information from the reception restriction processing apparatus 100, and broadcasts them through the broadcasting network something to do. Here, the broadcast providing apparatus 200 can simultaneously broadcast the encrypted broadcast contents and the corresponding encrypted entitlement control message (ECM) and partial encryption related information, and transmit the encrypted broadcast content and the corresponding encrypted entitlement control Message (ECM) and partial encryption related information, respectively.

The broadcast receiving apparatus 300 de-scrambles a specific data packet corresponding to the broadcast content processed by the reception restriction processing apparatus 100, that is, each data packet constituting the encrypted broadcast content, Thereby providing the viewer with a broadcast according to the broadcast content.

That is, the broadcast receiving apparatus 300 receives the encrypted broadcast content and the encrypted entitlement control message (ECM) and the partial encryption related information transmitted from the broadcast providing apparatus 200, I.e., the scrambled broadcast content, using the control key (CW) in the entitlement control message (ECM) obtained by decoding the encrypted entitlement control message (ECM).

At this time, the broadcast receiving apparatus 300 recognizes at least one data packet scrambled in the reception restriction processing apparatus 100 among the data packets in the encrypted broadcast contents, based on the partial encryption related information, in particular, the scrambling application information, It is possible to descramble only at least one corresponding data packet among the data packets in the encrypted broadcast content using the key CW.

Alternatively, the broadcast receiving apparatus 300 may receive the partial encryption related information, in particular the encryption ratio information, the operation performing information indicating the performed encryption selection operation, and the encryption selection value information indicating the encryption selection value, And the scrambling target data packet selection process according to the result of performing the encryption selection operation is performed in the same manner as described above, so that among the data packets in the encrypted broadcast content, the reception restriction processing apparatus 100 scrambles It recognizes at least one data packet and descrambles at least one corresponding data packet among the data packets in the encrypted broadcast content using the control key (CW).

Hereinafter, a specific configuration of the reception restriction processing apparatus 100 according to the present invention will be described with reference to FIG.

 The reception restriction processing apparatus 100 according to the present invention includes a packet count processing unit 110 for dividing a sequence of data packets constituting broadcasting contents subject to a broadcasting service into predetermined sizes, An operation performing unit 120 for performing a predetermined encryption selection operation on each packet count given by the packet count processing unit 110 based on the predetermined encryption ratio information, And a reception restriction processing unit 130 for scrambling the divided part corresponding to at least one packet count in which encryption is selected according to the result of performing the encryption.

The packet count processing unit 110 divides the sequence of data packets constituting the broadcast content subject to the broadcast service into a predetermined size and sequentially assigns packet counts corresponding to each of the divided data packets.

That is, when the broadcast content for the broadcast service is provided by the broadcast producer, the packet count processing unit 110 divides the sequence of data packets constituting the broadcast content into a predetermined size.

At this time, the packet count processing unit 110 preferably sets a packet setting size (e.g., 188 bytes) for dividing the sequence of data packets into data packet units. In this case, the packet count processing unit 110 divides the sequence of data packets constituting the broadcast content into a packet setting size (e.g., 188 bytes), and each divided part of the packet content corresponds to each data packet.

Then, the packet count processing section 110 can sequentially assign packet counts corresponding to each of the divided parts, that is, each data packet.

For example, the packet count processing unit 110 may perform a packet count 1 to the first data packet, a packet count 2 to the second data packet, and a packet count 3 to the third data packet corresponding to each divided / The packet count can be sequentially given to each data packet.

The operation performing unit 120 performs a predetermined encryption selection operation on each packet count given by the packet count processing unit 110 based on the predetermined encryption ratio information.

That is, the operation performing unit 120 stores the encryption ratio information preset by the operator who operates the reception restriction processing apparatus 100. [

Then, the operation performing unit 120 performs an encryption selection operation for dividing each packet count corresponding to each divided portion given by the packet count processing unit 110 by N according to the encryption ratio information to calculate a remaining value .

In other words, the operation performing unit 120 can calculate the remainder value divided by N corresponding to each packet count, by dividing each packet count by N according to the encryption ratio information.

For example, assuming that the encryption ratio information set by the operator is 10%, N = 10 and 50%, N = 2, the remaining values corresponding to each packet count, ie, the calculated values, will be.

packet
count The calculated value (N = 10) Whether scrambling is processed The calculated value (N = 2) Whether scrambling is processed One One X One X 2 2 X 0 O 3 3 X One X 4 4 X 0 O 5 5 X One X 6 6 X 0 O 7 7 X One X 8 8 X 0 O 9 9 X One X 10 0 O 0 O 11 One X One X

The reception restriction processing unit 130 scrambles the divided part corresponding to at least one packet count in which encryption is selected according to the result of the operation performed by the operation performing unit 120. [

That is, the reception restriction processing unit 130 recognizes at least one packet count having the predetermined encryption selection value as the calculation value based on the calculation value corresponding to each packet count according to the execution result of the calculation performing unit 120 .

In other words, the reception restriction processing unit 130 generates a packet count value having a predetermined encryption selection value, for example, a value 0 as a calculation value based on the calculated value corresponding to each packet count according to the result of the operation performed by the operation performing unit 120 It is possible to select a divided part, i.e., a data packet, corresponding to the recognized packet count as a scrambling object.

Referring to Table 1, when the encryption ratio information is 10% and N = 10, the reception restriction processing unit 130 divides the divided part, i.e., the data packet corresponding to the packet count 10, 20, 30 ..., The reception restriction processing unit 130 may select only 10% of the entire sequence of data packets of the broadcast content as the scrambling target. If the encryption ratio information is 50% and N = 2, That is, a data packet, as a scrambling target, and select only 50% of the entire sequence of data packets of the broadcast content as a scrambling target.

Then, the reception restriction processing unit 130 scrambles the corresponding divided part corresponding to at least one recognized packet count, that is, a data packet selected as a scrambling target, using a specific control key (CW).

Accordingly, in the reception restriction processing apparatus 100 according to the present invention, the control key (CW) is not used / scrambled for all the data packets constituting the broadcast contents, The partial encryption using the CAS technique can be performed on the broadcast content by using / scrambling the control key (CW) only for the selection of the data packet to be scrambled and the specific data packet selected through the rate information and the encryption selection operation.

Furthermore, the reception restriction processing unit 130 generates an entitlement control message (ECM) including the control key (CW) used for the scrambling process, and transmits the entitlement control message to the viewer side broadcast receiving apparatus 300 by using the client encryption key corresponding to the client encryption key.

Meanwhile, the reception restriction processing apparatus 100 according to the present invention further includes a content providing unit 140.

The content providing unit 140 receives the broadcast content scrambled by the reception restriction processing unit 130, the encryption ratio information corresponding to the broadcast content, the operation execution information indicating the encryption selection operation performed by the operation execution unit 120, A partial encryption related information including at least one of encryption selection value information indicating an encryption selection value and scrambling application information indicating at least one divided part scrambled, and an entitlement control message (ECM) including a control key (CW) To the broadcast providing apparatus 200 so that the broadcast providing apparatus 200 can broadcast them to the specific broadcast receiving apparatus 300. [

That is, the content providing unit 140 provides the encrypted content control message (ECM) corresponding to the scrambled and partially encrypted broadcast content and the broadcast content to the broadcast providing apparatus 200 can do.

At this time, the content providing unit 140 transmits the encryption ratio information reflected by the packet count processing unit 110, the operation performing unit 120 and the reception restriction processing unit 130, Related information including at least any one of operation-performing information indicating the operation selection information indicating the encryption selection value, encryption selection value information indicating the encryption selection value, and scrambling application information (e.g., data packet identification information) indicating the corresponding scrambled data packet , And may provide such partial encryption related information to the broadcast providing apparatus 200 in correspondence with the encrypted broadcast contents and the encrypted entitlement control message (ECM).

Hereinafter, the configuration of the broadcast receiving apparatus 300 according to the present invention will be described in detail with reference to FIG.

The broadcast receiving apparatus 300 according to the present invention includes a content receiver 310 for receiving broadcast content and a control word (CW) from an Entitlement Control Message (ECM) corresponding to the broadcast content And a reception restriction controller 320 for de-scrambling a specific divided part of the sequence of data packets constituting the broadcast content using the control key.

The content receiving unit 310 receives broadcast content broadcasted from outside.

That is, the content receiving unit 310 can receive the encrypted broadcast content transmitted by the broadcast providing apparatus 200 in the form of a TS packet, the corresponding encrypted qualification control message (ECM), and partial encryption related information.

The reception limitation control unit 320 acquires a control word (CW) from an Entitlement Control Message (ECM) corresponding to the broadcast content received through the content receiving unit 310.

That is, the reception restriction control unit 320 decodes the entitlement control message (ECM) received through the content receiver 310 using its own client encryption key, and transmits the decrypted entitlement control message (ECM) CW) can be obtained.

The reception restriction control unit 320 descrambles a specific divided part of the sequence of data packets constituting the corresponding broadcast content received through the content receiving unit 310 using the control key CW.

That is, the reception restriction control unit 320 receives the partial encryption related information corresponding to the corresponding broadcast content received through the content reception unit 310, and scrambles It is possible to recognize a data packet corresponding to at least one divided part processed.

Specifically, the partial encryption-related information includes encryption ratio information corresponding to broadcast contents, operation execution information indicating an encryption selection operation performed by the operation performing unit 120, encryption selection value information indicating an encryption selection value, and scrambling processing And at least one of scrambling application information indicating at least one divided part that has been generated.

That is, partial encryption related information is transmitted to the packet count processing unit 110, the arithmetic execution unit 120, and the reception restriction processing unit 130 for partial encryption in the above-described reception restriction processing apparatus 100 At least one of the encryption ratio information reflected, the encryption execution information indicating the performed encryption selection operation, the encryption selection value information indicating the encryption selection value, and the scrambling application information (e.g., data packet identification information) indicating the scrambled corresponding data packet .

Based on the scrambling application information included in the partial encryption related information, the reception restriction control unit 320 recognizes at least one divided part scrambled among the data packets in the corresponding broadcast content, i.e., at least one data packet scrambled , It is possible to descramble only at least one corresponding data packet among the data packets in the broadcast content using the control key CW.

Alternatively, based on the encryption ratio information included in the partial encryption-related information, the operation execution information indicating the encryption selection operation performed at the time of encrypting the broadcast content, and the encryption selection value information indicating the encryption selection value, At least one divided part, i.e., at least one scrambled data packet, which is scrambled at the time of encryption, among the data packets in the content, recognizes at least one data packet of the data packets in the broadcast content using the control key (CW) Only the packet may be descrambled.

In other words, based on the encryption ratio information included in the partial encryption-related information, the operation execution information indicating the encryption selection operation performed in the encryption of the broadcast content, and the encryption selection value information indicating the encryption selection value, By performing the packet counting and the encryption selection operation for the corresponding broadcast contents in the reception restriction processing apparatus 100 and the data packet selection process for the scrambling subject to the execution result in the same manner, The at least one data packet scrambled in the processing device 100 is recognized and the corresponding at least one data packet among the data packets in the broadcast content can be descrambled using the control key CW.

The broadcast receiving apparatus 300 receives the broadcast content, the encrypted entitlement control message (ECM), and the partial encryption related information through the broadcast providing apparatus 200. The broadcast receiving apparatus 300 receives the encrypted broadcast content And a control key (CW) in an entitlement control message (ECM) obtained by receiving an encrypted entitlement control message (ECM) and partial encryption related information and decrypting an encrypted entitlement control message (ECM) I.e., the scrambled broadcast contents, by using the descrambling process.

As described above, the broadcasting reception restriction service system according to the present invention is a CAS technology for encrypting (scrambling) broadcasting contents in order to charge a broadcasting service and decoding (descrambling) only legitimate viewers It is possible to reduce the resource usage rate required for the encryption of the broadcast content and the decryption of the reception side to increase the efficiency of the broadcast service implementation using the CAS technology by partially encrypting the broadcast content based on a specific encryption ratio predetermined by the operator .

Hereinafter, a broadcast reception limiting service method according to a preferred embodiment of the present invention will be described with reference to FIG. 4 to FIG. Here, for convenience of description, the components shown in FIGS. 1 to 3 will be described with reference to corresponding reference numerals.

First, referring to FIG. 4, a broadcast reception limiting service method according to a preferred embodiment of the present invention will be described.

The reception restriction processing apparatus 100 assigns a packet count corresponding to each data packet constituting the broadcast content to be broadcast service target (S10), and transmits the corresponding packet given to each data packet based on the preset encryption ratio information (S20), and scrambling at least one specific data packet selected according to the result of the execution (S30).

That is, the reception restriction processing apparatus 100 is a device that applies CAS technology by processing broadcast contents provided from a broadcast producer that produced broadcast contents for a broadcast service.

For example, when the broadcast content for the broadcast service is provided from the broadcast producer, the reception limit processing device 100 divides each data packet by dividing the sequence of data packets constituting the broadcast content into predetermined sizes, The packet count can be sequentially given in response to the packet.

Then, the reception restriction processing apparatus 100 performs a predetermined encryption selection operation on the corresponding packet count given to each data packet based on the predetermined encryption ratio information.

That is, when the reception restriction processing apparatus 100 stores the encryption ratio information preset by the operator who operates the reception restriction processing apparatus 100, the encryption limit information is applied to each packet count given to each data packet, The calculated value corresponding to each packet count can be obtained.

Then, the reception restriction processing apparatus 100 scrambles at least one specific data packet selected according to the result of performing the encryption selection operation.

That is, the reception restriction processing apparatus 100 recognizes at least one packet count having the predetermined encryption selection value as the calculation value based on the calculation value corresponding to each packet count according to the result of performing the encryption selection calculation , And only the corresponding data packet corresponding to the recognized packet count can be scrambled using a specific control key (CW).

Therefore, in the reception restriction processing apparatus 100, the control key (CW) is not used / scrambled for all the data packets constituting the broadcast content, and the packet counting and encryption ratio information for each data packet and encryption It is possible to perform partial encryption using the CAS technique for broadcast contents by selectively using the scrambling target data packet and using / scrambling the control key (CW) only for the selected specific data packet through the selection operation.

Then, the reception restriction processing apparatus 100 generates an entitlement control message (ECM) including the control key (CW) used for the scrambling process, and transmits the entitlement control message to the viewer side broadcast reception And provides the encrypted broadcast content and the encrypted entitlement control message (ECM) to the broadcast providing apparatus 200 providing the broadcast service (S40).

At this time, the reception restriction processing apparatus 100 transmits the encryption ratio information corresponding to the broadcast contents, the computation execution information indicating the performed encryption selection computation, the encryption selection value information indicating the encryption selection value, and the at least one scrambled data packet Related information including at least one of the scrambling application information indicating the content to be transmitted and the scrambling application information indicating the content to be transmitted to the broadcast providing apparatus 200.

The broadcast providing apparatus 200 TS packets the encrypted broadcast contents, corresponding encrypted qualification control message (ECM) and partial encryption related information from the reception restriction processing apparatus 100, and broadcasts them through the broadcasting network (S50).

The broadcast receiving apparatus 300 receives the encrypted broadcast content and the encrypted entitlement control message (ECM) and the partial encryption related information transmitted from the broadcast providing apparatus 200, The scrambled broadcast content can be descrambled using the control key (CW) in the entitlement control message (ECM) obtained by decoding the entitlement control message (ECM) (S60).

At this time, the broadcast receiving apparatus 300 recognizes at least one data packet scrambled in the reception restriction processing apparatus 100 among the data packets in the encrypted broadcast contents, based on the partial encryption related information, in particular, the scrambling application information, It is possible to descramble only at least one corresponding data packet among the data packets in the encrypted broadcast content using the key CW.

Alternatively, the broadcast receiving apparatus 300 may receive the partial encryption related information, in particular the encryption ratio information, the operation performing information indicating the performed encryption selection operation, and the encryption selection value information indicating the encryption selection value, And the scrambling target data packet selection process according to the result of performing the encryption selection operation is performed in the same manner as described above, so that among the data packets in the encrypted broadcast content, the reception restriction processing apparatus 100 scrambles It recognizes at least one data packet and descrambles at least one corresponding data packet among the data packets in the encrypted broadcast content using the control key (CW).

The broadcast receiving apparatus 300 reproduces the descrambled broadcast content to output the broadcast to the viewer (S70).

Hereinafter, an operation method of the reception limiting apparatus according to the present invention will be described in more detail with reference to FIG.

The operation of the reception limiting apparatus 100 according to the present invention stores the encryption ratio information previously set by the operator who operates the reception limiting processing apparatus 100 (S100).

A method of operating the reception limiting apparatus 100 according to the present invention divides a sequence of data packets constituting broadcasting contents to be broadcast service into a predetermined size (S110), sequentially counts packet counts (S120).

That is, when the broadcast content for the broadcast service is provided from the broadcast producer, the operation of the reception limiting apparatus 100 according to the present invention divides the sequence of data packets constituting the broadcast content into a predetermined size.

At this time, it is preferable that the operation of the reception limiting apparatus 100 according to the present invention sets a packet setting size (e.g., 188 bytes) for dividing a sequence of data packets into data packets. In this case, the operation of the reception limiting apparatus 100 according to the present invention divides a sequence of data packets constituting broadcast contents into a packet setting size (e.g., 188 bytes) Data packet.

In the method of operating the reception limiting apparatus 100 according to the present invention, packet counts may be sequentially given in correspondence with each of the divided parts, that is, each data packet.

For example, a method of operation of the reception limiting apparatus 100 according to the present invention includes: counting packet counts 1, 2, 3, The packet count can be sequentially given to each data packet in a manner of giving the count 3.

The operation of the reception limiting apparatus 100 according to the present invention performs a predetermined encryption selection operation on each packet count given in operation S120 (S130).

That is, the method of operation of the reception limiting apparatus 100 according to the present invention includes the steps of: dividing each packet count corresponding to each divided part given in step S120 by N according to the encryption ratio information, Can be performed. In other words, the operation of the reception limiting apparatus 100 according to the present invention can calculate the remainder value divided by N corresponding to each packet count, by dividing each packet count by N according to the encryption ratio information.

For example, assuming that N = 10 when the encryption ratio information set by the operator is 10%, and N = 2 when it is 50%, the remaining values corresponding to each packet count, that is, the calculated values, Will be the same.

The method of operation of the reception limiting apparatus 100 according to the present invention scrambles the divided part corresponding to at least one packet count in which encryption is selected according to the execution result.

That is, the method of operation of the reception limiting apparatus 100 according to the present invention includes the steps of: generating at least one packet count having a predetermined encryption selection value as a calculation value based on a calculation value corresponding to each packet count according to the result of the step S130; (S140).

In other words, the method of operation of the reception limiting apparatus 100 according to the present invention recognizes a packet count having a predetermined encryption selection value, for example, a value of 0 as a calculation value based on a calculation value corresponding to each packet count, That is, the data packet corresponding to the recognized packet count can be selected as a scrambling object.

Referring to Table 1 above, when the encryption ratio information is 10% and N = 10, the method of operation of the reception limiting apparatus 100 according to the present invention is divided into a division corresponding to the packet count 10, 20, 30, If the encryption ratio information is 50% and N = 2, the reception restriction device 100 according to the present invention selects only a part of the sequence of data packets of the broadcast content as a scrambling target, Only the 50% of the entire sequence of the data packets of the broadcast content is selected as the scrambling target by selecting the divided part corresponding to the packet counts 2, 4, 6, 8,.

The operation of the reception limiting apparatus 100 according to the present invention scrambles a corresponding divided part corresponding to at least one recognized packet count, that is, a data packet selected as a scrambling target, using a specific control key (CW) (S150).

Meanwhile, a method of operating the reception limiting apparatus 100 according to the present invention is a method of operating the reception limiting apparatus 100 according to an embodiment of the present invention, in which the recognition result encryption selection value in step S140, for example, a corresponding division part corresponding to a packet count The data packet will not be scrambled.

Accordingly, the operation of the reception limiting apparatus 100 according to the present invention is not limited to using / scrambling the control key (CW) for all the data packets constituting the broadcast contents, And partial encryption using the CAS technology for broadcast content can be performed by using / scrambling the control key (CW) only for the selected data packet and for the selected specific data packet through the encryption ratio information and the encryption selection operation.

The method of operation of the reception restriction apparatus 100 according to the present invention can provide the broadcast providing apparatus 200 with the scrambled or partially encrypted broadcast content and the encrypted entitlement control message (ECM) corresponding to the broadcast content (S160).

That is, the method of operation of the reception restriction apparatus 100 according to the present invention generates an Entitlement Control Message (ECM) including a control key (CW) used for scrambling processing, Side broadcast receiving apparatus 300 having the client-side encryption key.

The method of operation of the reception limiting apparatus 100 according to the present invention further comprises the step of transmitting the content encrypted and scrambled by the broadcasting providing apparatus 100 200 so that the broadcast providing apparatus 200 can broadcast them to the specific broadcast receiving apparatus 300. [

The method of operation of the reception limiting apparatus 100 according to the present invention may include the steps of performing the partial encryption on the corresponding broadcast contents by using the encryption ratio information reflected in steps S110 to S150, Related information including at least one of encryption selection value information indicating a value and scrambling application information (e.g., data packet identification information) indicating a corresponding data packet scrambled, and further encrypting the partial encryption- (ECM) to the broadcast providing apparatus 200 in response to the received broadcast content and the encrypted entitlement control message (ECM).

Hereinafter, an operation method of the broadcast receiving apparatus according to the present invention will be described in more detail with reference to FIG.

The operation method of the broadcast receiving apparatus 300 according to the present invention receives broadcasting contents broadcasted from the outside (S200).

That is, the operation method of the broadcast receiving apparatus 300 according to the present invention is a method of operating the broadcast receiving apparatus 300 according to an embodiment of the present invention, in which encrypted broadcast contents transmitted by the broadcast providing apparatus 200 in the form of TS packets and encrypted corresponding entitlement control messages (ECM) Lt; / RTI >

The operation method of the broadcast receiving apparatus 300 according to the present invention acquires a control word (CW) from an Entitlement Control Message (ECM) corresponding to the received broadcast content (S210). That is, the operation method of the broadcast receiving apparatus 300 according to the present invention decrypts the received entitlement control message (ECM) using its own client cryptographic key, and transmits the decrypted entitlement control message (ECM) Can be obtained.

The operation method of the broadcast receiving apparatus 300 according to the present invention descrambles a specific divided part of a sequence of data packets constituting the broadcast content received this time using the control key CW.

That is, the operation method of the broadcast receiving apparatus 300 according to the present invention is a method in which the reception restriction processing apparatus 100 performs scrambling processing among the data packets in the encrypted broadcast content based on the partial encryption related information corresponding to the received broadcast contents The data packet corresponding to at least one divided part may be recognized (S220).

Specifically, the partial encryption-related information includes encryption-ratio information corresponding to the broadcast content, encryption-operation-value information indicating the encryption-selection value indicating the performed encryption-selection operation, and at least one scrambling- And the scream blinding application information indicating the scream blinding application.

That is, partial encryption related information is transmitted to the packet count processing unit 110, the arithmetic execution unit 120, and the reception restriction processing unit 130 for partial encryption in the above-described reception restriction processing apparatus 100 At least one of the encryption ratio information reflected, the encryption execution information indicating the performed encryption selection operation, the encryption selection value information indicating the encryption selection value, and the scrambling application information (e.g., data packet identification information) indicating the scrambled corresponding data packet .

The method of operating the broadcast receiving apparatus 300 according to the present invention is a method of operating at least one divided part of data packets in a corresponding broadcast content, that is, at least one scrambled part, which is scrambled, based on scrambling- A corresponding data packet recognized as having been scrambled is descrambled (S230) by using the control key CW, and a descrambling process is performed on the unscrambled data packet It may not be performed.

Accordingly, a method of operating the broadcast receiving apparatus 300 according to the present invention is a method of descrambling only the corresponding data packets scrambled during encryption and partially decrypting (descrambling) And outputs broadcast contents (S240).

Alternatively, the operation method of the broadcast receiving apparatus 300 according to the present invention may include: an encryption ratio information included in the partial encryption-related information; an operation performing information indicating an encryption selection operation performed when the broadcast contents are encrypted; (At step S220) at least one divided part of the data packets in the corresponding broadcast content, which has been scrambled in the encryption process, i.e., at least one scrambled data packet, based on the value information, The descrambling process may be performed using the control key CW (S230), and the descrambling process may not be performed on the data packet not subjected to the scrambling process.

That is, an operation method of the broadcast receiving apparatus 300 according to the present invention is a method of operating the broadcast receiving apparatus 300 according to the first embodiment of the present invention. The operation of the broadcast receiving apparatus 300 includes the encryption ratio information included in the partial encryption- Based on the value information, performs the packet counting and the encryption selection operation on the corresponding broadcast content in the above-mentioned reception restriction processing apparatus 100, and the data packet selection process of the scrambling object in accordance with the execution result, The mobile station recognizes at least one data packet scrambled in the reception restriction processing apparatus 100 among the data packets and descrambles at least one corresponding data packet among the data packets in the broadcast content using the control key CW Can be processed.

Accordingly, a method of operating the broadcast receiving apparatus 300 according to the present invention is a method of descrambling only the corresponding data packets scrambled during encryption and partially decrypting (descrambling) And outputs broadcast contents (S240).

The operation method of the broadcast receiving apparatus 300 according to the present invention, which receives the broadcast content, the encrypted qualification control message (ECM) and the partial encryption related information through the broadcast providing apparatus 200, (ECM), which is obtained by receiving an encrypted broadcast content and an encrypted entitlement control message (ECM) and partial encipherment related information broadcasted from a broadcast station and decrypting an encrypted entitlement control message The scrambled broadcast content can be descrambled by using the control key CW in the sub-scrambled broadcast content.

As described above, the broadcasting reception restriction service method according to the present invention is a broadcasting reception restriction service method in which broadcast contents are encrypted (scrambled) in order to charge a broadcasting service, and only a viewer having a proper viewing right decodes (descrambles) Technology is partially applied based on a specific encryption ratio predetermined by the operator rather than the entire broadcast content, thereby lowering the resource usage rate required for encryption of the broadcast content and decryption of the receiver, thereby improving the efficiency of the broadcast service implementation using the CAS technology Can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

Receiving a file including encryption related information corresponding to broadcast content and the broadcast content;
Obtaining an Entitlement Control Message (ECM) of a specific part of a sequence of data packets constituting the broadcast content; And
And de-scrambling the specific portion based on the entitlement control message,
Each of the data packets is given a packet count,
Wherein the specific portion to be descrambled is determined based on the encryption related information and the packet count included in the file. 2. The method of claim 1, wherein the step of descrambling comprises:
A control unit for recognizing a type of a scrambling operation for at least one portion of the data packets in the broadcast content that has been scrambled and receiving a control key (CW) included in the entitlement control message, when receiving the scrambling application information corresponding to the broadcast content; And descrambling the data packets corresponding to the at least one portion of the data packets in the broadcast content. 2. The method of claim 1, wherein the step of descrambling comprises:
Related information corresponding to the broadcast content, encryption-ratio information included in the partial-encryption-related information, operation-performing information indicating an encryption-selection operation performed when the broadcast content is encrypted, Information on at least one portion of the data packets in the broadcast content that has been scrambled in the encryption, and transmits the data in the broadcast content (CW) using the control key (CW) included in the entitlement control message And descrambling the recognized data packet among the packets. Providing a packet count corresponding to each of data packets constituting broadcast contents to be broadcast service;
Performing a predefined encryption selection operation on the assigned packet count based on preset encryption ratio information; And
And scrambling a portion corresponding to at least one packet count for which encryption is selected according to the result of the encryption selection operation. 5. The method of claim 4, wherein the step of providing the packet count comprises:
Dividing a sequence of data packets constituting the broadcast content into a predetermined packet setting size, dividing each data packet, and providing a packet count corresponding to each data packet. 6. The method of claim 5,
Storing the predetermined encryption ratio information, and performing an encryption selection operation for calculating a remaining value by dividing each given packet count by N according to the encryption ratio information. 5. The method of claim 4, wherein the step of scrambling comprises:
Recognizing at least one packet count having a predetermined encryption selection value as a calculation value based on a calculation value corresponding to each packet count in accordance with a result of the encryption selection calculation and determining at least one packet count corresponding to the recognized at least one packet count (CW) by using a specific control key (CW).

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