JP4298106B2 - EMM update number setting method, EMM broadcasting method and broadcasting system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an update number setting method for individual information (EMM: Entitlement Management Message) broadcast by digital broadcasting, an EMM broadcast method for broadcasting an EMM with an update number assigned thereto, and a broadcast system for implementing the method. In particular, it enables transmission of EMM with a large amount of information.
[0002]
[Prior art]
In digital broadcasting, program information (ECM) and EMM are multiplexed and broadcast on video / audio data of a program.
[0003]
This EMM includes information for each receiving device such as work key information used for ECM encryption and contract information of each receiving device. For example, a “contract” is sent to each receiving device using the EMM. Thank you for your support, and you can send a message about contract renewal and viewing fee guidance, saying, “Last month's viewing fee has not been paid”.
[0004]
In the EMM, the work key and information for each receiving device are encrypted, and the ID and update number of the receiving device are added before the encrypted data.
[0005]
On the broadcast station side, when an EMM is sent to a receiving device, an EMM having the same contents is repeatedly sent every predetermined time in order to increase reception opportunities at the receiving device and ensure reception. In addition, when updating the information content of the EMM, the EMM update number is incremented by 1 and transmitted.
[0006]
On the other hand, when receiving the EMM with the ID addressed to itself, the receiving device looks at the update number and processes the EMM only if it is larger than the update number of the EMM received last time. By taking such a procedure, it is possible to prevent the receiving apparatus from processing the same EMM many times.
[0007]
FIG. 4 shows a conventional broadcasting system that transmits and receives the EMM.
[0008]
This system is composed of a station equipment 1 that sends out an EMM, a receiver 2 that receives the EMM, and a security module 3 of the receiver that consists of an IC card. The station equipment 1 creates an EMM that creates an EMM. 11, an update number database (DB) 12, an update number assigning unit 13 for assigning an update number to the EMM, and an EMM sending unit 14 for repeatedly sending EMMs having the same contents.
[0009]
The receiver 2 includes a receiving unit 21 that receives an EMM with an ID addressed to the receiver 2 and an interface (IF) 22 with the IC card (security module) 3.
[0010]
In addition, the security module 3 includes an update number determination unit 23 that determines whether or not to process from an EMM update number, and an EMM processing unit 24 that decrypts information on the EMM to be processed.
[0011]
In this system, every time the EMM creation unit 11 of the station equipment 1 creates an updated EMM addressed to each receiver, the update number assignment unit 13 assigns an update number for each receiver ID. As shown in FIG. 5, the update number is displayed as a 16-bit numerical value, for example.
[0012]
The EMM receiving unit 21 of the receiver 2 receives the EMM to which the ID addressed to itself is attached and outputs it to the security module 3 through the IC card IF22. The update number determination unit 23 of the security module 3 stores the EMM update number received last time, and the EMM is processed only when the EMM update number received this time is larger than the stored update number. Output to part 24. When the EMM is input, the EMM processing unit 24 decrypts the encrypted information included in the EMM.
[0013]
In the security module 3, the input EMM is temporarily held in the RAM, and update number determination and decryption processing are performed.
[0014]
[Problems to be solved by the invention]
However, the conventional system has a problem that a large amount of information cannot be included in the EMM.
[0015]
This is because the capacity of the RAM of the IC card constituting the security module is small. If the capacity of this RAM is 100 bytes, the EMM cannot be made larger than 100 bytes.
[0016]
In addition, when the information of the amount of 200 bytes is divided into 100 bytes, for example, and two EMMs with update numbers 50 and 51 are created and transmitted, the EMM with the update number 51 is first sent by the receiver. The EMM with the update number 50 cannot be received. Therefore, in the conventional system, it is impossible to divide information and transmit it by a plurality of EMMs.
[0017]
The present invention solves such a conventional problem, and provides a method for setting an EMM update number that makes it possible to divide information and create a plurality of EMMs. It is an object of the present invention to provide an EMM broadcasting method and a broadcasting system for implementing the method.
[0018]
[Means for Solving the Problems]
Therefore, in the EMM update number setting method of the present invention, the EMM update number is divided into a number part and a flag part, and the EMMs that are continuously sent out have the same numerical value in the number part and the flag position in the flag part. Different update numbers are assigned.
[0019]
Further, in the EMM broadcasting method of the present invention, the transmission side gives an update number divided into a number part and a flag part as an update number to the EMM, and the reception side has the numerical value of the number part of the received update number of the EMM, If it is larger than the maximum value of the number part of the EMM update number already processed, or the number part of the update number of the received EMM is the same as the maximum value of the number part of the update number of the already processed EMM If the flag position of the flag part of the update number of the received EMM is different from the flag position of the flag part of the update number of the EMM having the largest numerical value in the number part, the received EMM is processed. Yes.
[0020]
Further, in the EMM broadcasting system of the present invention, an EMM creating means for creating an EMM, an EMM dividing means for dividing an EMM whose information amount is larger than a predetermined amount, an update number database, and an update number flag Management means, and an update number assigning means for assigning an update number divided into a number part and a flag part to the EMM, and the security module on the receiving side is provided with the number in the number part of the update number of the EMM. Update number determination means for determining whether or not EMM processing is necessary and EMM flag management means for determining whether or not EMM processing is necessary based on an EMM update number flag are provided.
[0021]
Therefore, when the amount of information of EMM is large, it can be divided and transmitted to a plurality of EMMs, and the receiving side checks the numerical value of the number part of the update number and the position of the flag, respectively. The EMM can be processed without omission and there is no possibility of duplicate processing.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
An EMM update number setting method in the embodiment of the present invention will be described.
[0023]
As shown in FIG. 2, the update number includes an update number numerical value part and a reception flag part. For example, when the use frame of the update number is 16 bits, as shown below, the upper 13 bits are assigned to the update number numerical value part to display the numerical value of the update number, and the lower 3 bits are assigned to the reception flag part for reception. Display flags.
000000000000110 100
[0024]
When there is a large amount of information in the EMM, the information is divided to create a plurality of EMMs, and each EMM has the same numerical value in the update number numerical value part, and is given an update number that is different only in the reception flag position. Continuously send EMMs.
[0025]
For example, if the capacity of the RAM of the IC card constituting the security module of the receiver is 100 bytes and the amount of information to be transmitted by the EMM is 270 bytes, the amount of individual information becomes 100 bytes or less. In this way, it is divided into three to create three EMMs, and the update number of the first EMM is
000000000000110 100
And set the second EMM update number to
000000000000110 010
And set the third EMM update number to
000000000000110 001
Set to.
[0026]
The security module of the receiver can identify each EMM as an EMM that conveys the divided information from the update number. And even if the numerical value of the update number numerical part is the same, all the EMMs having different reception flag positions are decrypted, and the newly received EMM is the same as the already processed EMM and the update number numerical part. If not only the numerical value but also the flag position is the same, the EMM is discarded. By doing so, it is possible to process all of the divided EMM information while eliminating EMM duplication processing.
[0027]
As a result of such processing, if 3 bits are allocated to the reception flag, it is possible to transmit the information amount of (IC card RAM capacity × 3) using the divided EMMs.
[0028]
FIG. 1 shows a broadcasting system that implements this EMM update number setting method.
[0029]
The station equipment 1 includes an EMM creating unit 11 that creates an EMM, an EMM dividing unit 15 that divides the EMM, an update number database (DB) 12, a flag management unit 16 that manages an update number reception flag, an EMM, An update number assigning unit 13 for assigning an update number to the EMM, and an EMM sending unit 14 for sending an EMM.
[0030]
The receiver 2 includes an EMM receiver 21 and an IC card IF 22 as in the conventional system.
[0031]
In addition, the security module 3 includes an update number determination unit 23 that determines the update number numerical part of the update number of the EMM, an EMM flag management unit 25 that manages the reception flag of the update number of the EMM, and information on the EMM to be processed. And an EMM processing unit 24 for decoding.
[0032]
In this system, the EMM creation unit 11 of the station equipment 1 creates an EMM addressed to each receiver. When the information amount of the created EMM exceeds the capacity of the RAM of the IC card 3, the EMM dividing unit 15 divides the EMM into a plurality of pieces so that the information amount of each EMM is equal to or less than the RAM capacity.
[0033]
The update number assigning unit 13 assigns the numerical value of the update number numerical value unit for each receiver ID and the reception flag managed by the update number flag management unit 16 to each EMM.
[0034]
When the flag managed by the update number flag management unit 16 is, for example, 3 bits, the update number assignment unit 13 sets “111” as the update number numerical value for each receiver ID for the EMM not divided by the EMM division unit 15. Is added. Further, for the EMM divided into two by the EMM dividing unit 15, a flag of “110” is added to one and “001” is added to the other. In addition, flags of “100”, “010”, and “001” are added to the EMM divided into three by the EMM dividing unit 15, respectively.
[0035]
The EMM sending unit 14 of the station equipment 1 sends the EMM with the update number. At this time, a plurality of divided EMMs having the same update number numerical value and different only in the flag position are sent out continuously (simultaneously).
[0036]
The EMM receiving unit 21 of the receiver 2 receives the EMM to which the ID addressed to itself is attached and outputs it to the security module 3 through the IC card IF22.
[0037]
The update number determination unit 23 of the security module 3 compares the numerical value of the update number numerical value part of the update number of the EMM with the stored update number numerical value, and it is clear that the processing is unnecessary in view of the update number numerical value. And other EMMs are sent to the EMM flag management unit 25.
[0038]
The EMM flag management unit 25 manages the flag position of the maximum update number input so far. For example,
000000000000110 100
Following the update number,
000000000000110 010
If you enter an update number for
000000000000110 110
Manage the flag in the form of
000000000000110 001
If you enter
000000000000110 111
The flag is managed in the form of. When a new EMM update number is input from the update number determination unit 23, if the update number value is incremented, the update number up to that point is discarded, the input update number is retained, and the update number is updated. If the numerical value is the same, paying attention to whether or not the flag position is already 1, it is determined whether or not the EMM processing is unnecessary, and the EMM that does not require processing is excluded. The EMM information that has not been excluded is decoded by the EMM processing unit 24.
[0039]
FIG. 3 shows a processing flow in the security module 3.
[0040]
Step 1: When EMM is received,
Step 2: Check the update number numerical value part and if it is smaller than the numerical value stored in the IC card,
Step 3: The EMM is not processed and discarded.
[0041]
In step 2, if the numerical value in the update number numerical value part is larger than the numerical value stored in the IC card,
Step 4: Process the EMM,
Step 5: Overwrite the update number with the value.
[0042]
In step 2, if the numerical value in the update number numerical value part is the same as the numerical value stored in the IC card,
Step 6: Check the flag part of the update number, and if the bit that is “1” in the sent flag part is already “1”,
Step 7: The EMM is not processed and discarded.
[0043]
In Step 6, when the bit that is “1” in the sent flag part is “0”,
Step 8: Process the EMM,
Step 9: The corresponding bit is set to “1”.
[0044]
By performing such processing by the security module, it becomes possible to divide and send the EMM.
[0045]
Although the case where the number of bits of the reception flag portion of the update number is 3 has been described here, the number of bits may be 2 or 4 or more. In this case, the total amount of information that can be transmitted by dividing the EMM is (RAM capacity of the IC card × number of bits of the reception flag).
[0046]
In this system, there is no change regarding the receiver, and the conventional receiver can be used as it is.
[0047]
For EMM information to be processed reliably, the update number assigning unit 13 of the station equipment 1 has a specific update number for the EMM, for example,
0000000000000 000
And the security module 3 unconditionally processes the EMM of this update number, so that it is possible to convey information that requires reliable processing without error.
[0048]
【The invention's effect】
As is clear from the above description, according to the present invention, a lot of information can be transmitted by a plurality of EMMs. On the receiving side, the plurality of EMMs can be processed without omission and there is no possibility of overlapping processing.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an EMM broadcasting system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a data structure of an EMM update number in the embodiment of the present invention;
FIG. 3 is a flowchart showing a processing procedure on the receiving side of the EMM broadcasting system in the embodiment of the present invention;
FIG. 4 is a block diagram showing a configuration of a conventional EMM broadcasting system;
FIG. 5 is a diagram showing a data structure of an update number assigned to a conventional EMM.
[Explanation of symbols]
1 Station equipment 2 Receiver 3 Security module
11 EMM creation department
12 Update number database
13 Update number assignment section
14 EMM sending part
15 EMM division
16 Flag Management Department
21 EMM receiver
22 IC card IF
23 Update number judgment part
24 EMM processing section
25 EMM Flag Management Department

Claims (5)

In the update number setting method for assigning an update number to an EMM, when the information amount of the EMM to be sent is larger than a predetermined amount, the EMM is divided into a plurality of pieces so as to be equal to or less than the predetermined amount, and continuously sent. for each EMM after the division, a renewal number which is divided into number portion and a flag portion, that numerical value of the number portion is the same, and the flag position of said flag portion is given different update number An EMM update number setting method as a feature. In the EMM broadcasting method in which an EMM transmission side apparatus transmits an EMM with an update number and the EMM reception side apparatus determines whether to process the EMM based on the received EMM update number.
When the information amount of the EMM to be sent exceeds a predetermined value, the transmitting side device divides the EMM so that it falls within the predetermined value,
Each of the divided EMMs is provided with an update number that is divided into a number part and a flag part, wherein the numerical value of the number part is the same and the flag position of the flag part is different ,
The receiving side device compares the numerical value of the number part of the received EMM update number with the numerical value of the number part of the already processed EMM update number,
Numerical number of newly received EMM update number, if already greater than the number value of the number of treated EMM update number,
Or
Numerical number of newly received EMM update number is the same as already number value of number of treated EMM update number, and the flag position of the flag of the newly received the EMM update number Is different from the flag position of the flag part of the update number of the EMM already processed ,
An EMM broadcasting method characterized by processing a newly received EMM. The transmission side device continuously transmits a plurality of EMMs assigned with update numbers having the same numerical value in the number part of the update number and different flag positions in the flag part of the update number. The EMM broadcasting method as described. The transmission side device gives an update number consisting only of a specific numerical value to the EMM for which a reliable process is requested,
3. The EMM broadcasting method according to claim 2, wherein the receiving side apparatus unconditionally processes the EMM when the received EMM update number is composed of only the specific numerical value. In an EMM broadcasting system in which an EMM transmitting device transmits an EMM with an update number, and an EMM receiving device determines whether to process the EMM based on the received EMM update number,
The sending device is
EMM creation means for creating an EMM;
An EMM dividing unit that divides the EMM so that the information amount of the created EMM exceeds a predetermined value ;
An update number database;
Flag management means for managing the flag of the update number;
An update number divided into a number part and a flag part is assigned to the EMM ,
Each of the EMMs divided by the EMM dividing means comprises update number assigning means for assigning update numbers having the same numerical value in the number part and different flag positions in the flag part ,
The security module of the receiving device is
Update number storage means for storing the number part and flag part of the update number of the already processed EMM;
The numerical value of the number part of the update number of the already processed EMM is compared with the numerical value of the number part of the newly received EMM update number, and the numerical value of the number part of the newly received EMM update number is already processed. An update number determination means for determining that EMM processing is unnecessary when the number is smaller than the numerical value of the number part of the update number of the EMM, and for determining that EMM processing is necessary when larger than the numerical value of the number part of the already processed EMM update number ;
The update number determination means compares the update number flag portion with the update number of the already processed EMM for the EMM determined to have the same numerical value in the update number number portion. An EMM broadcasting system comprising: an EMM flag management unit that determines that EMM processing is not required when the flag positions are the same and determines that EMM processing is required when the flag positions are different .

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