JP3420667B2 - IC card for decoder and scramble system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decoder IC card and a scramble system used for pay broadcasting such as satellite broadcasting, communication satellite broadcasting and CATV.

[0002]

2. Description of the Related Art In conventional pay satellite broadcasting, signals are transmitted by a scramble system in order to limit the reception of the broadcast to only authorized subscribers. The receiver side is provided with a scrambled broadcast decoder device (hereinafter referred to as a decoder device) for returning the received signal to the state before scrambled.

In this decoder device, a type in which an IC card having a processor and a memory built therein is mounted in the decoder device main body and used for control is used in Europe and America. In such a type of decoder device, a different receiver identification code (hereinafter, abbreviated as ID) is stored in each IC card, and the broadcasting station manages the ID and controls whether or not viewing is possible. ing.

In this case, one encryption / decryption key (Km) linked with the ID is assigned to one ID, the control information for the decoder device is encrypted with this encryption / decryption key Km, and then the ID of each decoder device is set. It is given and transmitted, and each decoder device decrypts the control information with the encryption / decryption key Km.
This prevents falsification and unauthorized viewing of information that controls the decoder device on the way.

Conventionally, after the viewing contract, the ID stored is I
Since the C card is lent to the receiving contractor, the ID and the encryption / decryption key Km are managed and operated as a pair as described above.

[0006] Then, as pay broadcasting further develops in the future, and the number of new broadcasters' entry opportunities increases, ICs will already be available.
For users who have a card type decoder device,
It is possible to distribute an IC card to promote the acquisition of new contracts.

This new contract acquisition promotion IC card is a trial viewing IC card whose validity is limited to a certain period or a certain time (hereinafter referred to as a trial viewing IC card). Later, a system is conceivable in which only those who wish to view the pay broadcast in earnest will make a formal contract.

[0008]

However, the number of users who have a regular contract is estimated to be smaller than the number of distributed trial viewing IC cards, but as described above, the ID and the encryption / decryption key Km are internally provided. If the trial viewing IC cards that are allocated and stored as a pair are distributed, a situation may occur in which the number of IDs is insufficient. This situation will be described in detail below.

At present, in the pay broadcasting system in Japan that does not use the IC card as described above (the system used in the current JSB broadcasting), the ID is 32 bits. This presupposes a system in which only a person who has made a formal contract receives the decoder device having the ID built therein. Therefore, even if the number of IDs is not as large as 2 ³² = 4.3 billion, it can be said that it is a sufficient number to cover the increased number of regular contracts.

However, if a service system is adopted in which the IC card having the ID and the encryption / decryption key Km as a pair manages the decoder device and distributes the IC card for trial viewing as described above, 43 100 million ICs
Cards may not be enough.

As a means for coping with such a situation, for example, simply increasing the number of bits of the ID is a bit of the ID data which also serves as a destination (header) when the decoder device is controlled by a signal multiplexed on the broadcast wave. Since the length is increased, there is a problem in that the ID area of the transmission path becomes large and the amount of data to be transmitted increases.

In view of the above problems, an object of the present invention is to provide a decoder IC card and a scramble system which do not increase the number of bits of the ID even if a large number of trial viewing IC cards are distributed. is there.

[0013]

To achieve the above object, the present invention has the following constitution. That is, the invention according to claim 1 is a decoder IC card which can be attached to and detached from the scramble broadcast decoder device main body and which controls descrambling, comprising a non-volatile storage means for storing in advance a first recipient identification code and a decoding key. Decoding means for decoding the encrypted and multiplexed second receiver identification code using the decoding key, and the decoded second receiver identification code stored in the non-volatile storage means. The gist of the present invention is to include a control means.

According to a second aspect of the present invention, in a decoder IC card which is attachable to and detachable from a scramble broadcast decoder main body and which controls descrambling, a first receiver identification code, a decryption key and the validity of the IC card are provided. Non-volatile storage means for storing in advance validity information for limiting the above, decryption means for decrypting the encrypted second receiver identification code by using the decryption key, and the validity information. Validity determining means for determining the validity of the IC card based on the above, and the decoded second recipient identification code can be stored in the non-volatile storage means, Control means for controlling so that the descrambled signal is not output from the scrambled broadcast decoder main body when the IC card is not determined to be valid. And summarized in that with a.

According to a third aspect of the present invention, in the decoder IC card according to the second aspect, the validity information is
The validity period data is the validity period data indicating the validity period of the IC card, and the validity determining means compares the date information indicating the date when the decoder device is operated with the validity period data for determination. To do.

The date information indicating the date when the decoder device is operated is the date information from the calendar clock built in the decoder device body or the date information multiplexed and transmitted in the broadcast and separated. Can be used.

According to a fourth aspect of the invention, in the decoder IC card according to the second aspect, the validity information is
It is time limit data for limiting the time during which scrambled broadcast can be viewed using the IC card, and the validity determination means compares the accumulated time data for viewing the scrambled broadcast with the time limit data for determination. Is the gist.

According to a fifth aspect of the invention, when the first receiver among a plurality of receivers having the same temporary receiver identification code makes a regular reception contract, the temporary receiver identification code is used as the temporary receiver identification code. When the regular receiver identification number of the first receiver is used and another receiver having the temporary receiver identification code makes a regular reception contract, the regular receiver identification code encrypted and multiplexed in the broadcast is decoded. It is a scramble system that is obtained by decrypting with a key.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Here, prior to the description of the embodiments of the present invention, the basic concept of the present invention will be described. In general, the encryption / decryption key Km, which is built in the scramble broadcast decoder device and does not need to be transmitted, is set to be larger than the number of bits of the ID in order to enhance security.
For example, when the ID is 32 bits, the encryption / decryption key Km
Is 50 to 60 bits or more.

In the present invention, this "number of bits of ID << K
The above problem is solved by focusing on the actual situation of "the number of bits of m". The means is to use the same temporary ID for all IC cards (trial IC cards) distributed for trial viewing purposes.
(Temporary receiver identification code) is added, and an encryption / decryption key Km (for example, Km1, Km2, ..., Km different for each IC card is given.
i, ..., Kmn). The viewer uses the trial viewing card to preview the broadcast.

When a viewer having a decoder device equipped with an IC card to which such a temporary ID is attached wants to make a regular contract thereafter, the broadcaster uses the I used by the viewer.
I at the time of regular contract using the encryption / decryption key Kmi in the C card
The D (primary ID) is encrypted, and the temporary ID header is attached and sent. Then, the decoder device using the IC card to which the temporary ID is assigned sets the temporary ID in the individual information filter,
The data is received and decrypted with Km.

However, since the corresponding encryption / decryption key Kmi is unique, the encrypted primary ID can be correctly decrypted by the encryption / decryption key Kmi in a large number of IC cards having the same temporary ID. Only the IC card of the contractor. In this way, the broadcast apparatus is provided with the primary ID by broadcasting, and the received decoder apparatus stores this primary ID in the non-volatile memory in the IC card. After receiving the primary ID, this will be used as a header to receive data in the future, and it will operate.

The temporary ID used here is the same for all the trial viewing cards, but a plurality of temporary IDs are prepared according to the purpose, for example, the temporary ID of the IC card issued monthly (yearly) is changed. May be.

Next, a first embodiment of a scrambled broadcast decoder device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of a scramble broadcast decoder device according to the present embodiment.

As shown in FIG. 1, a scramble broadcast decoder device 1 is required for descrambler 2 having a function of restoring scrambled video and audio signals to an original state and descramble for decryption or reception only. An individual information filter 3 for extracting individual information of the contractor, a program information filter 4, and an IC card 11 described next are provided.

The IC card 11 stores an interface section 23 that interfaces with the above-mentioned individual information filter 3, program information filter 4, descrambler 2, etc., a CPU 25 that controls the entire decoder device, and a program of the CPU 25. The ROM 27, the RAM 29 which is the work area of the CPU 25, the Km memory 31 storing the encryption / decryption key Km for each contractor, and the temporary recipient identification code (temporary I
D) or a temporary I that stores the correct recipient identification code (correct ID)
A D memory, a primary ID memory 33, and a bus 21 interconnecting these components are provided.

The Km memory 31 and the temporary ID memory
The primary ID memory 33 is a non-volatile memory such as an EEPROM, and is a separate component for logically clarifying the stored contents, but it can also be integrated as a single physical memory having different storage areas. .

Next, the operation of this embodiment will be described. First, a viewer who is interested in pay broadcasting is a trial viewing IC in which individual information including a temporary ID is stored in advance in the IC card.
The card is attached to the main body of the decoder device for viewing (trial viewing). Here, in general pay broadcasting, information about individual contractors (hereinafter, abbreviated as individual information) such as whether or not a contract is continued and viewing fee payment status, and information related to programs (hereinafter abbreviated as program information) It is determined whether or not the program can be viewed by comparing and comparing with, and the viewing control such as descrambling is performed.

If the viewer has a regular contract according to the result of the trial viewing, the viewer uses the communication means such as a telephone or a postcard to the broadcasting company, and in the case of satellite broadcasting or one-way CATV, the viewer himself or herself. Informs the information of the IC card used by (which can specify the temporary ID used by the viewer and the encryption / decryption key Kmi).

The broadcaster uses the IC used by this viewer.
The normal identification code (primary ID) is encrypted by using the encryption / decryption key Kmi inside the card, and the encrypted primary ID is included in the individual information with the header of the temporary ID, and the viewer is broadcast. To receive. Hereinafter, the primary ID receiving operation of the scramble broadcast decoder device 1 (see FIG. 1) will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. First, in the scramble broadcast decoder device 1, the C in the IC card 11 is
The PU 25 reads the temporary ID stored in the temporary ID memory 33, and sets the temporary ID in the individual information filter 3 of the decoder device body via the interface unit 23 (step S10).

Next, the individual information broadcasted by the individual information filter 3 to which the temporary ID is given is filtered, only the individual information having the header equal to the temporary ID is selected, and the data is transmitted via the interface unit 23. Since the IC card 11 is given to the IC card 11, the IC cards of all the decoder devices having the temporary ID will receive the individual information including the primary ID (step S20).

Next, the received data is decrypted with the decryption key Km (step S30), and it is determined whether the decryption result is correct (step S40). The only IC card whose decryption result is OK is the IC card (decryption key Kmi) of the viewer who requested the contract, and I card having the same other temporary ID.
Since the C card has a different decryption key Km, it cannot be decrypted correctly. I got the individual information that was OK
The C card extracts the primary ID (step S50), and E
Temporary ID memory that is non-volatile memory such as EPROM
The primary ID is stored in the primary ID memory 33 (step S
60). The area to be stored may be the area in which the temporary ID has been stored until now, or may be stored in another area.

The primary ID is a temporary ID memory / primary ID memory 33.
After being stored in the individual information filter, the primary ID is set in the individual information filter, and the individual information with the primary ID header added is taken in to control the decoder device. Is encrypted with the encryption / decryption key Km, and the header of the primary ID is added and transmitted, whereby the viewing control of the decoder device is performed.

In this way, a specific IC card having a unique decryption key Kmi is selected from a large number of IC cards having the same temporary ID, and the temporary ID of the decoder device equipped with the IC card is switched to the regular ID.

Next, a second embodiment of the decoder IC card according to the present invention will be described.

FIG. 3 is a block diagram showing the configuration of a scrambled broadcast decoder device using the decoder IC card of this embodiment. The difference between the present embodiment and the first embodiment is that this embodiment stores valid period information for limiting its validity in the decoder IC card as compared with the first embodiment. However, it is a point that viewing is not possible outside this valid period.

The present embodiment is basically the same as the first embodiment, but in order to determine whether or not it is within the valid period based on the stored valid period information. The decoder device main body is provided with a calendar clock 5 for counting and updating date and time information, and the decoder IC card 12 has a nonvolatile effective period memory 3 in which an effective period is stored in advance.
5 is different from the first embodiment.

Then, the program of the CPU 25 compares the current date held by the calendar clock 5 with the valid period stored in the valid period memory 35, and if the current date is within the valid period, the descrambler. 2 is provided with a descrambling key so that the descramble key can be viewed, and a function of not allowing the descrambler 2 to be viewed unless the current date is within the valid period is added. This realizes the expiration date of the viewing IC card. The comparison between the date and the valid period can be realized by providing a comparator and controlling the descrambler 2 by the output signal thereof, not by the program of the CPU 25.

When the regular contract is made within the expiration date, the primary ID multiplexed in the broadcast is stored in the temporary ID memory / primary ID using the non-volatile memory by the same procedure as in the first embodiment. It is stored in the memory 33, and thereafter controlled by the primary ID.

Next, a third embodiment of the decoder IC card according to the present invention will be described. FIG. 4 is a block diagram showing the configuration of a scrambled broadcast decoder device using the decoder IC card of this embodiment. The difference between the present embodiment and the first embodiment is that this embodiment stores time limit information for limiting its validity in the decoder IC card as compared with the first embodiment. However, it is a point that viewing is impossible except for this time limit.

This embodiment is basically the same as the first embodiment, but in order to determine whether it is within the time limit, the decoder IC card 13 is provided with A non-volatile time limit memory 37 in which the trial viewing time limit is stored in advance and a non-volatile cumulative viewing time memory 39 in which the cumulative viewing time is stored are provided.

This cumulative viewing time is used when the viewer is performing trial viewing, and the cumulative viewing time memory 39 stores the cumulative time when the viewer actually viewed the broadcast, and the cumulative viewing time. And the time limit for trial viewing are compared, and when the cumulative viewing time exceeds the time limit for trial viewing,
It is used to make subsequent viewing impossible.

The program of the CPU 25 includes a cumulative viewing time counting function for updating the contents stored in the cumulative viewing time memory 39 each time a predetermined viewing time (for example, 1 second, 1 minute) elapses, and the cumulative viewing time. The content stored in the memory 39 is compared with the content stored in the time limit memory 37. If the content of the cumulative viewing time memory 39 exceeds the content of the time limit memory 37, a viewing time restriction function for making subsequent viewing impossible. And have been added.

The predetermined viewing time may be notified by using a timer function provided inside the CPU 25, or by separately providing a hardware timer and interrupting the CPU 25 every predetermined time.

Of course, when the regular contract is made when the cumulative viewing time is less than the time limit, the primary ID is fetched by the same procedure as in the first embodiment, and the primary ID is stored in the non-volatile memory. After storing, the update of the cumulative viewing time or the comparison between the cumulative viewing time and the time limit is stopped.

As a modification of the present embodiment, the cumulative viewing time memory 39 is not provided and only the time limit memory 37 is used to sequentially subtract the viewing time from the contents of the time limit memory 37. It is also possible to control so that subsequent viewing is impossible when the content of 37 becomes zero.

Next, a fourth embodiment of the decoder IC card according to the present invention will be described. FIG. 5 is a block diagram showing the configuration of a scramble broadcast decoder device using the decoder IC card of this embodiment. The difference between this embodiment and the second embodiment is that this embodiment does not provide a calendar clock inside the decoder device as compared with the second embodiment, and It is to determine whether the IC card is within the valid period by using the included date information.

In this case, the program of the CPU 25 extracts date information from the data extracted through the program information filter 4, and extracts the extracted date information and the effective period information data stored in the effective period memory 35. In comparison, if the value indicated by the date information is out of the valid period, the pay broadcast is controlled to be unviewable.

As in the case of the second embodiment, when a regular contract is made within the valid period, the same procedure is followed for the primary ID.
Is stored in the non-volatile memory 33 in the IC card.

In addition, when the above-mentioned regular contract is made, the temporary ID of the IC card used by the viewer who first makes a contract in the order of acceptance of the regular contract at the broadcasting station side is the ID at the time of the regular contract. For the second and subsequent contractors, as in the above case, the encrypted primary ID is taken in by the temporary ID, the encrypted primary ID is decrypted by the individual Kmn, and if the determination of the decryption result is correct, the IC card By storing the temporary ID in the non-volatile memory, it is possible to effectively use the limited ID without making the temporary ID disposable.

[0051]

As described above, according to the present invention, there is a limited number of IDs, which reduces the risk of ID shortage that may occur when the IDs used in the IC card for trial viewing are thrown away.
It becomes possible to effectively use the IC card itself, and by adding a function that allows a regular contract for a disposable IC card for the purpose of trial viewing, it is possible to effectively use the IC card itself. Also, provisional I
Since the number of types of D itself is small, the amount of data used for control information on the broadcast station side can be small.

Further, by providing the IC card for the purpose of trial viewing with the information that further limits the validity, it becomes possible to give a wide range of operation on the broadcast station side.

[Brief description of drawings]

FIG. 1 is an IC for a scrambled broadcast decoder according to the present invention.
It is a block diagram which shows 1st Embodiment of the decoder apparatus which used the card.

FIG. 2 is a flow chart illustrating the operation of the first embodiment.

FIG. 3 is an IC for a scramble broadcast decoder according to the present invention.
It is a block diagram which shows the 2nd Embodiment of the decoder apparatus which used the card.

FIG. 4 is an IC for a scramble broadcast decoder according to the present invention.
It is a block diagram which shows the 3rd Embodiment of the decoder apparatus which used the card.

FIG. 5 is an IC for a scramble broadcast decoder according to the present invention.
It is a block diagram which shows the 4th Embodiment of the decoder apparatus which used the card.

[Explanation of symbols]

1 ... Scrambled broadcast decoder device 2 ... Descrambler 3 ... Individual information filter 4 ... Program information filter 11 ... IC card 21 ... Bus 23 ... Interface section 25 ... CPU 27 ... ROM 2
9 ... RAM 31 ... Km memory 33 ... Temporary ID memory / regular ID memory

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04N 7/167 H04N 7/167 Z (72) Inventor Yasushi Otagiri 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Multimedia Technology Co., Ltd. (56) References JP-A-7-202884 (JP, A) JP-A-8-8853 (JP, A) JP-A-9-46682 (JP, A) JP-A-9-139930 (JP, A) ) JP 62-177693 (JP, A) JP 4-205093 (JP, A) JP 1-217587 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06K 17/00 G06K 19/00-19/07 G09C 1/00 H04H 1/00 H04L 9/10 H04N 7/167

Claims (5)

(57) [Claims] 1. A decoder IC that is attachable to and detachable from a scramble broadcast decoder device body and controls descrambling.
In the card, a non-volatile storage means in which a first receiver identification code and a decoding key are stored in advance, and a decoding for decoding the second receiver identification code encrypted and multiplexed in the broadcast by using the decoding key. An IC card for a decoder, comprising: a means; and a control means for storing the decoded second recipient identification code in the nonvolatile storage means. 2. A decoder IC which is attachable to and detachable from a scramble broadcast decoder main body and controls descramble.
In the card, a non-volatile storage means in which a first receiver identification code, a decryption key, and validity information for limiting the validity of the IC card are stored in advance, and a second reception encrypted and multiplexed in a broadcast. A decryption unit that decrypts a person identification code using the decryption key; a validity determination unit that determines the validity of the IC card based on the validity information; and a decrypted second recipient identification code. Control which can be stored in the non-volatile storage means and which controls so that a descrambled signal is not output from the scrambled broadcast decoder body when the IC card is not judged to be valid by the validity judging means. An IC card for a decoder, comprising: 3. The validity information is validity period data indicating a validity period of the IC card, and the validity determining means includes date information indicating a date when the decoder device is operated and the validity period data. 3. The decoder IC card according to claim 2, wherein the determination is made by comparing with. 4. The validity information is time limit data for limiting a time during which the scrambled broadcast can be viewed using the IC card, and the validity determination means and the accumulated time data for viewing the scrambled broadcast and the 3. The decoder IC card according to claim 2, wherein the determination is made by comparing with the time limit data. 5. When the first recipient of a plurality of recipients having the same provisional recipient identification code makes a regular reception contract,
When the temporary receiver identification code is the regular receiver identification number of the first receiver, and when another receiver having the temporary receiver identification code makes a regular reception contract, it is encrypted and multiplexed into the broadcast. A scramble system characterized in that the authorized receiver identification code is decrypted and obtained using a decryption key.