JP3047865B2 - Broadcast receiving device and broadcast receiving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiving apparatus and a broadcast receiving method, and more particularly to a broadcast receiving apparatus and a broadcast receiving method for determining whether to view a program based on key data stored in an IC card.

[0002]

2. Description of the Related Art Conventionally, a broadcast receiving apparatus and a broadcast receiving method, in particular, a pay-for-viewing broadcast receiving apparatus have a built-in function for extracting program information necessary for viewing a program. The function of extracting the program information is generally configured to have confidentiality by key data in order to allow only a specific person to view in the case of pay broadcasting.

In recent years, as digital broadcasting such as CATV and satellite broadcasting has become widespread, an IC card has been increasingly used as a method of distributing key data for decoding encrypted program information. This is a paid service typified by a method of charging for each program called PPV (pay-per-view) and a method of charging for each time called PPT (pay-per-time). In any case, if the encrypted program information is not decrypted,
You cannot watch the program.

[0004] In order to view these broadcasts, a contract with a broadcaster (mainly a company that manages keys) is made.
By receiving personal contract information (hereinafter, also referred to as contract information), receiving the distributed contract information, the program information can be decoded, and the program can be viewed. Key data is essential for receiving the contract information and the like, and it is necessary to mount an IC card including the key data on the broadcast receiving apparatus. This IC card is provided mainly for each broadcast receiving device. As described above, distribution of key data by an IC card is becoming popular due to its ease of management and high secrecy.

[0005]

However, the above conventional example has the following problems. The first problem is that broadcast receivers of the same model (specification) are generally used,
Any broadcast receiving apparatus of the same model (specification) can use one IC card. The second problem is that the key data is transferred from the IC card to the broadcast receiving apparatus and used, so that the key data written on the IC card is transferred to the broadcast receiving apparatus while being encrypted and used. However, as long as the key data is transferred, the key data may be extracted and decrypted. From these first and second problems, there is a problem that confidentiality for specifying a broadcast viewer is low.

The present invention follows the conventional system type,
It is another object of the present invention to provide a broadcast receiving apparatus and a broadcast receiving method with enhanced confidentiality.

[0007]

In order to achieve the above object, a broadcast receiving apparatus according to the present invention comprises: an IC card which stores predetermined key data at least in upper and lower parts; A storage circuit for reading and storing the key data of the portion, and reading means for reading the remaining key data of the remaining portion excluding the partial key data of the predetermined key data, and is composed of the partial key data and the remaining key data. It is characterized in that whether or not to view a program is determined based on the key data.

The IC card has a storage unit for storing a flag for determining whether or not to read any one of the key data. The storage circuit includes:
It is preferable that a storage unit that stores a flag for determining whether the reading of the key data of any one of the portions is performed is configured.

Further, the above-mentioned IC card preferably has an error adding circuit for intentionally inserting an error into the key data, and the broadcast receiving apparatus preferably has an error removing circuit for removing the error.

According to a fifth aspect of the present invention, there is provided a broadcast receiving method for confirming whether or not an IC card is inserted into an IC card slot.
A card insertion confirming step, an IC card key data reading step of reading at least one of the key data stored in the IC card, at least divided into upper and lower parts, and an IC card key A decoder key data writing step of writing the key data of the part read in the data reading step to a predetermined storage circuit, wherein the key data of the part stored in the decoder key data writing step and the remaining key data stored in the IC card are stored. It is characterized in that whether or not the program viewing is permitted is determined as one key data by using the key data of the part.

Further, in the above-mentioned broadcast receiving method, an IC card flag checking step for checking a flag for determining whether or not an IC card key data reading step is performed, and whether or not a decoder key data writing step is performed is determined. And a decoder flag confirming step for confirming a flag for the above.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a broadcast receiving apparatus and a broadcast receiving method according to the present invention; 1 to 4 show a broadcast receiving apparatus and a broadcast receiving method according to an embodiment of the present invention.

<First Embodiment> Referring to FIG. 1, a broadcast receiving apparatus according to a first embodiment includes a broadcast receiving apparatus and a broadcast receiving method (hereinafter, also referred to as a decoder) 1 and an IC card 11. Is done.

The decoder 1 includes a nonvolatile storage circuit (hereinafter also referred to as a memory) 13 and a central processing unit (hereinafter referred to as a CP).
U) 15, an IC card slot 16, and an encryption / decryption circuit 17. The flag 13 and the key data 14 are stored in the memory 13 of the above-described component. Also, CPU
Reference numeral 15 has a storage circuit (not shown) for storing a program therein, and stores a program for controlling the operation of the broadcast receiving apparatus 1. The CPU 15 and each unit are connected by an 8-bit address bus ADDR and a data bus DATA.

In the IC card 11, a storage circuit 111
(Hereinafter, also referred to as a memory).
Stores a flag 112 and key data 113 and 114. The key data 113 and 114 are divided into upper and lower parts, and are composed of key data 113 of upper data (hereinafter also referred to as upper key data) and key data 114 of lower data (hereinafter also referred to as lower key data). Is done.

Next, an operation example of the broadcast receiving apparatus and the broadcast receiving method according to the first embodiment of the present invention will be described. FIG.
5 is a flowchart showing an operation example of the broadcast receiving device 1 and the IC card 11 having the above configuration. Hereinafter, an operation example of a program stored in the CPU 15 will be described with reference to FIG. FIG. 2 shows an operation example of transferring the key data of the IC card 11 to the decoder 1.

First, in step S1, it is confirmed that the IC card 11 is inserted into the IC card slot 16 of the broadcast receiving device.

If the insertion is confirmed (S1
/ YES), it is confirmed that the flag 112 of the IC card 11 is high "H" (S2). Also, it is confirmed that the flag 12 of the decoder 1 is high “H” (S
3).

If there is no problem up to this point, the key data (higher-order key data in this embodiment) divided from the IC card 11 1
13 (S4), and the read upper key data 1
13 is written to the memory 14 of the storage circuit 13 of the decoder 1 (S5). That is, it is registered.

Next, the respective flags 12, 112 of the IC card 11 and the decoder 1 are set to low "L" (S6,
S7). Thus, the key data is divided into the decoder 1 and the IC card 11.

FIG. 3 shows the operation until the key data 113 and 114 stored in the IC card 11 and the key data 14 transferred to the decoder 1 are set for use inside the decoder.

As described above, first, it is confirmed that the IC card 11 is inserted into the IC card slot 16 (S
11). If it is confirmed that it is inserted (S11 /
YES), the flag 112 of the IC card 11 is low “L”
(S12), and whether the flag 12 of the decoder 1 is low (L) (S13). If there is no problem up to this point (S11 to S13 / YES), IC card 1
The remaining key data (lower-order key data 114 in this embodiment) divided from 1 is read out to the decoder 1 (S14), and the key data (upper-order key data 1 in this embodiment) stored in the decoder 1 is read out (S14). S15) These key data are set together in the encryption / decryption circuit (S16).

In FIG. 1, the CPU 15 in the decoder 1
Of the upper key data 113 and the lower key data 114 in the IC card 11 (either one is acceptable, but in the present embodiment, the upper key data is transferred). Key data 1
4 is stored. After that, the flag 12 in the decoder 1 and the flag 112 in the IC card 11 indicate the transfer.
Is set to high "H". These flags 12 and 11
By changing from low “L” to high “H” in No. 2, it is determined that the key data 113 has already been transferred to the decoder 1 and has been used.

In the above operation procedure, the key data IC
The relationship with the card will be described in more detail as follows. Assume now that the contract with the broadcaster has already been completed for ease of explanation. It is also assumed that the flag 12 and the flag 112 are active low “L”, and the initial state is high “H”. It is assumed that both the upper key data 113 and the lower key data 114 are stored as data in the IC card 11 and that each of them is assumed to be 8 bits. Address bus ADD
It is assumed that both R and data bus DATA are 8-bit buses.

Referring to FIG. 1, first, the IC card 11
Into the IC card slot 16 of the decoder 1. When the CPU 15 in the decoder 1 detects that the flag 112 in the IC card 11 is high “H”,
The CPU 15 transfers either the upper key data 113 or the lower key data 114 in the IC card 11. In this example, it is assumed that the upper key data 113 is read into the decoder 1 and used. The upper key data 113 by the CPU 15
Is set as key data 14 at a location defined in the memory 13 via the IC card slot 16 and the data bus DATA.

Next, the CPU 15 sets the flag 112 in the IC card 11 and the flag 12 in the decoder 1 to low "L". Then, the CPU 15 deletes the upper key data 113 in the IC card 11. Thereby, the IC card 11
The transfer process ends with the upper-level key data 113 in the key 13 as the key data 14 in the location defined in the memory 13. The encryption / decryption circuit 17 differs for each system provider, and has a function of decrypting the contract information or the program information by using the key data 14 in the memory 13 and the key data 114 in the IC card 11. The program can be viewed based on the received data.

<Second Embodiment> Next, a second embodiment will be described. In the description of the second embodiment, with reference to FIG. 4, mainly the points different from the first embodiment compared with FIG. 1 will be described.

Referring to FIG. 4, a decoder 2 and an IC card 21 are provided. Memory (storage circuit) in decoder 2
13, an IC card slot 16, an encryption / decryption circuit 17, and an error removal circuit 23. The flag 13 and the key data 14 are stored in the memory 13.
The error removing circuit 23 is a circuit unit that changes key data input via the IC card slot 16 in a predetermined procedure.

The IC card 21 comprises a memory (storage circuit) 211 and an error adding circuit 212.
The flag 213 and the upper key data 21 are stored in the memory 211.
4 and lower key data 215 are stored. The error adding circuit 212 is a circuit unit that changes the key data, the upper key data 214 and / or the lower key data 215 output from the IC card 21 in a predetermined procedure. That is, the key data stored in the memory 211 is stored in an IC
When outputting from the card 21, the data is not processed as it is, but is processed and changed according to a predetermined procedure before being output.

In the operation of the broadcast receiving apparatus 2 and the IC card 21 having the above configuration, when the key data is exchanged between the broadcast receiving apparatus 2 and the IC card 21, the key data is not exchanged in a straightforward manner. For example, processing is performed according to a predetermined procedure, and the broadcast reception apparatus 2 and the IC card 21 output the contents as contents different from the contents of the key data stored and held in each of them. The receiving side decrypts the key data in the reverse procedure changed on the transmitting side, and stores the decrypted key data in the memory. Other operations may be the same as in the first embodiment.

The above embodiment is an example of a preferred embodiment of the present invention. However, it is not limited to this.
Various modifications can be made without departing from the spirit of the present invention.

[0032]

As is clear from the above description, claim 1
The broadcast receiving apparatus according to any one of (1) to (3), reads and stores any one of the stored key data from an IC card that stores predetermined key data at least into upper and lower parts and stores the key data. The remaining key data in the remaining portion of the key data excluding the partial key data is read, and whether to permit or not view the program is determined based on the key data composed of the partial key data and the remaining key data. Therefore, confidentiality can be easily improved by dividing and managing the key data in the IC card into the IC card and the broadcast receiving device.

[0033] According to a fourth aspect of the present invention, there is provided a broadcast receiving apparatus comprising:
Further, the IC card is provided with an error adding circuit for intentionally inserting an error into the key data, and the broadcast receiving apparatus is provided with an error removing circuit for removing the error. Therefore, confidentiality can be further improved by intentionally misleading the key data when transferring the key data from the IC card to the broadcast receiving device.

In the broadcast receiving method according to the fifth and sixth aspects of the present invention, the presence or absence of insertion of an IC card into an IC card slot is checked, and at least the upper / lower two parts stored in the IC card are stored. Read the stored key data of any one part, write the read key data to a predetermined storage circuit, and store the key data of the stored part;
Based on the key data of the remaining portion stored in the IC card, whether or not the program viewing is permitted is determined as one key data. Therefore, confidentiality can be easily improved by dividing and managing the key data in the IC card into the IC card and the broadcast receiving device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a broadcast receiving apparatus according to the present invention.

FIG. 2 is a flowchart 1 showing an embodiment of a broadcast receiving method of the present invention.

FIG. 3 is a flowchart 2 showing an embodiment of the broadcast receiving method of the present invention.

FIG. 4 is a block diagram showing a second embodiment.

[Explanation of symbols]

 1, 2 Broadcast receiving device (decoder) 11, 21 IC card 12, 112, 213 Flag 13, 211 Storage circuit (memory) 14 Key data 15 Central processing unit (CPU) 16 IC card slot 17 Encryption / decryption circuit 111 Storage circuit ( Memory) 112 flag 113, 114 key data 212 error adding circuit 214 upper key data 215 lower key data

Continued on the front page (51) Int.Cl. ⁷ Identification code FI H04L 9/16 H04L 9/00 621A H04N 7/16 643

Claims (6)

(57) [Claims] 1. A storage circuit for reading and storing any one of the stored key data from an IC card which stores predetermined key data at least in upper / lower half, and said predetermined key data Reading means for reading the remaining key data of the remaining portion excluding the partial key data, and determining whether or not to view the program based on the key data composed of the partial key data and the remaining key data. Broadcast receiving device. 2. The IC card according to claim 1, wherein the IC card includes a storage unit for storing a flag for determining whether or not the key data of any one of the portions has been read. The broadcast receiving device according to the above. 3. The storage circuit according to claim 1, wherein the storage circuit is configured to store a flag for determining whether the key data of any one of the portions has been read. Or the broadcast receiving device according to 2. 4. The IC card according to claim 1, further comprising an error adding circuit for intentionally inserting an error into the key data, and wherein the broadcast receiving apparatus further comprises an error removing circuit for removing the error. The broadcast receiving device according to claim 1. 5. An IC card insertion confirmation step of confirming whether or not an IC card has been inserted into an IC card slot;
An IC card key data reading step for reading any one of the key data stored in the lower two parts, and a decoder for writing the key data of the part read in the IC card key data reading step to a predetermined storage circuit A key data writing step, wherein the key data of the part stored in the decoder key data writing step and the key data of the remaining part stored in the IC card are used as one key data for program viewing and listening. A broadcast receiving method characterized by determining whether to permit or not. 6. The broadcast receiving method further comprises:
An IC card flag checking step for checking a flag for determining whether or not the card key data reading step is performed; and a decoder flag checking step for checking a flag for determining whether the decoder key data writing step is performed. The broadcast receiving method according to claim 5, further comprising: