JP2000216771A - Scrambling system and descrambling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain scrambling in diversified forms. SOLUTION: In a scrambling system, newspaper data are inserted to a digital data channel of a satellite and are transmitted. Data on, e.g. a business climate page and a local edition in the newspaper data (e.g. consisting of data on the front page, a summary page, a business state page,..., a regional coverage,..., a radio TV program section) are scrambled (shown as left downward hatched portion in figure) by using a prescribed scrambling key and further scrambled (shown as right downward hatched portion in figure) by using other scrambling key.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrambler for descrambling data such as newspapers, books, magazines, etc., when the data is transmitted via, for example, a satellite.

[0002]

2. Description of the Related Art For example, in pay television broadcasting (or music broadcasting) using a broadcasting satellite, programs are scrambled and distributed in order to prevent interception of programs by non-subscribers. Those who want to watch the program can sign a subscription contract with the program provider,
Scramble key (decryption key) for descrambling
Can be received, so that the authorized subscriber can scramble and view the program.

[0003] At present, scrambling systems put into practical use in pay television broadcasting using broadcast satellites include a so-called COATEC system and a skyport (SKYPOR) system.
T) method.

[0004] Recently, as a data broadcasting system for electronically distributing data (newspaper data) of, for example, newspapers, a system in which newspaper data is inserted into a satellite data channel and transmitted via the satellite is used. Is considered. In this case, for example, a data receiving device in each home (contractor side) that has contracted for distribution of newspaper data receives a signal from a satellite and extracts newspaper data inserted into a data channel. Then, the newspaper data is recorded on a recording medium such as a magnetic disk or a magneto-optical disk, and is read therefrom as necessary. The read data is displayed on a display, for example, or printed out, so that the subscriber can view the newspaper.

[0005]

By the way, the above-mentioned scramble system is for a television broadcast or the like in which a program is watched mainly in real time, and is applied to the above-mentioned data broadcast system. Had the following issues.

That is, according to the above-mentioned scrambling method,
Since it is only possible to select the transmission of the program with scrambling or non-scramble, only a uniform service can be provided to all the subscribers. That is, it is impossible to allow a certain subscriber to view predetermined special newspaper data, and prevent another subscriber from viewing the special newspaper data.

[0007] As a result, the subscriber pays a so-called reception fee regardless of whether or not he / she views the broadcast newspaper data. Therefore, from the viewpoint of the contractor, the reception fee is paid not only to the newspaper data required by the subscriber but also to the unnecessary newspaper data, which causes an unfair feeling. This hinders an increase in the number of subscribers, and further reduces the profit of the information provider.

In the above-described scramble method, a scramble key for descrambling the scramble applied to the program is required when the program is received. The scramble key is transmitted together with the program. For this reason, for example, newspaper data received before contracting (scrambled)
After recording on a recording medium and signing a contract, a scramble key is obtained, and the scramble of the newspaper data recorded on the recording medium cannot be unscrambled for viewing.

[0009] The present invention has been made in view of such a situation, and enables to perform scrambling and descrambling suitable for a data broadcasting system.
As a result, various types of services can be provided.

[0010]

The scrambler of the present invention is a scrambler for scrambling data, and a scrambler for scrambling the entire data (for example, a data scrambler shown in FIG. 3). 14), and block-based scrambling means for selectively scrambling data in predetermined block units (for example, an information unit scramble processing unit 27 shown in FIG. 2).

In this scrambling device, the entire scrambling means can scramble the entire data scrambled in a predetermined block unit by the block unit scrambling means. When the data is data in a predetermined file unit, the block-based scrambling means
Scramble can be applied to each file.

The descrambling device according to the present invention is characterized in that
4. A descrambling device for descrambling data scrambled by the scrambling device according to any one of claims 3 to 3, wherein the whole descrambling means descrambles the scramble applied to the entire data by the whole scrambling means. (For example, a data descrambler 87 shown in FIG. 5) and a block-based descrambler (for example, an information unit shown in FIG. 6) which descrambles scrambled data in predetermined block units by the block-based scrambler. And a scramble processing unit 31).

In this descrambling device, when the storage device further includes storage means (for example, a recording medium 8 shown in FIG. 6) for storing the data descrambled by the whole descrambling means, the data is stored in the block-based descrambling means. The means can descramble the stored data. Further, reading means (for example, an IC shown in FIG. 11) for reading a scramble key from a storage medium storing a scramble key for descrambling scramble applied to data by a predetermined block unit with respect to data. In the case of further including a card interface device 111), it is possible to cause the block-based descrambling means to descramble using the scramble key read by the reading means.

An ID storage means (for example, a memory 83 shown in FIG. 5) for storing a unique ID is further provided. When the storage medium stores a predetermined ID in addition to the scramble key, the storage medium Can be read only when the ID stored in the ID storage means matches the ID stored in the storage medium.

In the scrambler of the present invention, data is selectively scrambled in predetermined block units, and the entire data is scrambled. Therefore, only the data desired by the contractor can be provided to the contractor.

In the descrambling device of the present invention,
The scramble applied to the entire data is descrambled, and the scramble applied to the data in a predetermined block unit is descrambled. Therefore, the contractor can receive only desired data.

[0017]

FIG. 1 shows a configuration example of a data broadcasting system to which the present invention is applied. For example, a newspaper company as an information provider has a large computer 1. The large computer 1 stores a paper space database. This space database includes article information for printing on newspapers, layout information, and the like. The data in this database is transmitted to the workstation 2 as needed, where it is edited.

That is, the data in the database is edited, for example, for each page, into article data in a format that can be easily searched by the receiver (contractor). For example, by this editing, a search screen is created in which the page is reduced as it is so that only the headline is visible while the layout is not changed. In addition, from this headline, the search screen (headline) so that the corresponding article can be displayed
Is linked to an article describing the details.
In this way, the data edited in a form that can be easily searched on the receiver side is transmitted to the broadcasting station 3 via, for example, a ground data line.

The data (newspaper data) transmitted to the broadcasting station 3 is inserted into, for example, a satellite data channel and transmitted via a satellite (broadcast satellite (BS) or communication satellite (CS)) 4 as described later. The data is transmitted to the receiver side (for example, a receiver (contractor) at each home).

FIG. 2 and FIG. 3 show the detailed configuration of the broadcasting station 3. Newspaper data transmitted from a newspaper company as an information provider is temporarily stored in the information storage unit 26 in a predetermined information unit (information 1, 2,..., N) as shown in FIG. That is, the newspaper data is temporarily stored in the information storage unit 26 in units of, for example, one page, a general page, a business condition page, a local page, a radio / TV program column, and the like.

The newspaper data of a predetermined information unit stored in the information storage unit 26 is supplied to an information unit scramble processing unit 27. In the information unit scramble processing unit 27, a predetermined scramble key (this is a scramble key for selectively scrambling newspaper data in a predetermined information unit, and hereinafter, appropriately referred to as an information unit scramble key). The scramble is selectively applied to newspaper data in a predetermined information unit.

That is, the information unit scramble processing unit 27 stores a number of the newspaper data stored in the information storage unit 26 in units of, for example, one page, total page, business page, local page, radio / TV program section, etc. (For example, newspaper data on the business and local aspects) or all of them are selected, and only the selected newspaper data is scrambled using the information unit scramble key (this scramble is described later with reference to FIG. 3). In the same manner as in the data scrambler 14).

Here, the information unit scramble processing unit 27
The newspaper data of a predetermined information unit to be scrambled is set (selected) in advance by an information provider, for example.
Is done. The information unit scramble key is transmitted together with the newspaper data from the information provider. Further, the information unit scramble key may be configured such that all the same data or different data is used for the newspaper data to be scrambled by the information unit scramble processing unit 27. ing.

The newspaper data of a predetermined information unit selectively scrambled as described above is serialized (arranged in a series) and output to the data scrambler 14 in FIG.

In the data scrambler 14, the newspaper data is scrambled in accordance with the pseudo random sequence output from the PN (Pseudo Noise) generator 13 and output to the independent data channel multiplexing circuit 12. PN generator 13
Is set in correspondence with the scramble key input thereto (this is a scramble key for scrambling the entire newspaper data, and is hereinafter appropriately referred to as a transmission channel scramble key). You.

Here, the information provider, a newspaper company,
In addition to the above-described newspaper data and the information unit scramble key, common information including a transmission channel scramble key, a data identifier (for identifying newspaper data), and the like, and individual data reception by the data receiving device 6 (FIG. 1). Unique receiving device I set for each device
D and data such as contract contents are transmitted.

The transmission channel scramble key, common information, receiving device ID, and contract contents are
(The transmission channel scramble key is PN
It is also supplied to the generator 13), where it is encrypted. The encrypted data is supplied to the independent data channel multiplexing circuit 12 as related information.

The independent data channel multiplexing circuit 12
The scrambled newspaper data supplied from the data scrambler 14 and the related information supplied from the encryption circuit 11 are multiplexed and output to the digital channel signal multiplexing circuit 15.

The digital channel signal multiplexing circuit 15 also receives an audio signal transmitted as a digital channel signal (at least a part of which is an audio signal accompanying a video signal described later). The digital channel signal multiplexing circuit 15 multiplexes the input audio signal (digital audio signal) with the data supplied from the independent data channel multiplexing circuit 12 and supplies the multiplexed signal to the 4-phase DPSK modulator 16.

The four-phase DPSK modulator 16 performs four-phase DPSK modulation on the input data and outputs the data to a video signal / digital channel signal multiplexing circuit 17. This video signal /
The digital channel signal multiplexing circuit 17 also has
A video signal broadcast at the broadcasting station 3 is input. While the audio signal input to the digital channel signal multiplexing circuit 15 is a digital signal, the video signal input to the video signal / digital channel signal multiplexing circuit 17 is an analog signal.

The video signal / digital channel signal multiplexing circuit 17 frequency-multiplexes the input video signal and the signal supplied from the four-phase DPSK modulator 16 to generate an FM signal.
Output to the modulator 18. The FM modulator 18 FM-modulates a predetermined carrier with the input signal and outputs the result to the up-converter 19. The up-converter 19 frequency-converts the input FM signal into a signal in a frequency band on the order of gigahertz (for example, a Ku band or a Ka band). The FM signal output from the up converter 19 is
After the power has been amplified by the power amplifier 20, the power is supplied to the transmission antenna 21 and transmitted therefrom to the satellite 4 (FIG. 1).

FIG. 4 shows a format (A-mode format) of digital channel data modulated by four-phase DPSK. As shown in the figure, data of one frame is constituted by data of a total of 2048 bits of 64 bits in width and 32 bits in height. A frame synchronization signal, a control signal, and a range bit signal are arranged (recorded) in the range of the first 2 bits × 32 bits.

Since one frame of data is transmitted in a time of 1 ms, the transmission rate is 2.048 Mbps.

The frame synchronization signal is a signal for synchronizing each frame. The control signal indicates whether the mode is the A mode or the B mode, whether the television audio signal (audio signal accompanying the video signal) (located in audio 1 and audio 2) is a stereo signal, Information indicating whether the signal is a channel signal or a monaural two-channel signal is included. Further, the control signal is whether the additional signal (located in audios 3 and 4) other than the television audio is a stereo audio signal, a monaural one-channel audio signal, or a monaural two-channel audio signal. Or information indicating whether the data is other than voice.

As shown in FIG. 4, in the next 10 × 32-bit range after the first 2 × 32-bit range, and in the subsequent three ranges of 10 × 32, audio data of audio 1 to audio 4 are respectively stored. Is recorded (arranged) (however, data other than audio may be arranged in audios 3 and 4 as described above). In each range of 10 × 32 bits, audio data is arranged for 32 samples. That is, the number of bits per sample is 10 bits.

In the A mode, one channel of audio data is arranged in this 10 × 32 bit range. In the B mode, however, 20 × 3 bits are arranged.
The audio data for one channel is arranged in a 2-bit range. That is, in the B mode, higher-quality audio data can be transmitted.

Following the data of voice 4, data of an independent data channel is arranged in a range of 15 × 32 bits, and a horizontal error correction code is arranged in a range of last 7 × 32 bits. ing.

The data of the independent data channel shown in FIG. 4 is transmitted in a predetermined packet unit. For example, 1
The packet is composed of 288 bits. The first 16 bits are a header, the subsequent 190 bits are arranged with substantial data, and the last 82 bits are arranged with a packet error correction code. The header includes at least a service identification code and its error correction code (check bit).
And the service identification code includes, for example, a code for identifying the above-described related information and newspaper data.

Associated information output by the encryption circuit 11 shown in FIG. 3 and newspaper data output by the data scrambler 14 are allocated to the independent data channel in packet units, and the data to which the packet is allocated is assigned. A service identification code is set corresponding to (whether the data is related information or newspaper data).

On the receiver side, the transmission channel scramble key of the information provider can be detected by monitoring the packet of the related information (transmission channel scramble key, common information, receiver ID, contract details, etc.). If the data receiving device having the receiving device ID included in the transmitted related information matches the contract contents, it is possible to download information (newspaper data) provided by a predetermined information provider. Become.

The above data is transmitted from the broadcasting station 3 in FIG. 1 to the satellite 4 and further transmitted from the satellite 4 to, for example, a receiver (contractor) in each home. In each home, a signal transmitted from a satellite 4 is received by a receiving antenna (parabolic antenna) 5 and further converted into a predetermined intermediate frequency signal (IF signal). This I
The F signal is input to the data receiving device 6. The IF signal input to the data receiving device 6 is demodulated there and recorded on the recording medium 8 by the recording device 7.

After recording the newspaper data on the recording medium 8,
By operating the user terminal 9, the contractor reads out the newspaper data via the recording device 7 and the receiving device 6, and displays the newspaper data on the monitor 10a.
0b can be printed out. If the recording medium 8 is removable, the recording medium 8
Can be directly attached to the user terminal 9 and the newspaper data recorded there can be displayed on the monitor 10a or printed out on the printer 10b.

Note that the receiving device 6 and the user terminal 9 can be integrally configured.

Next, FIG. 5 and FIG. 6 show a detailed configuration of the data receiving device 6. IF from receiving antenna 5
The signal is input to an FM demodulator 71 constituting a BS tuner. Further, a BS tuner control signal is input to the FM demodulator 71 from a channel button (not shown).
The FM demodulator 71 demodulates the IF signal of the channel corresponding to the BS tuner control signal into a baseband signal, and outputs a video signal / digital channel signal separation circuit 72
Output to The video signal / digital channel signal separation circuit 72 separates the video signal and the digital channel signal from the input signal, and outputs the video signal to the monitor 10a via the user terminal 9 (FIG. 1) for display. Let it.

On the other hand, the digital channel signal separated by the video signal / digital channel signal separation circuit 72 is input to a 4-phase DPSK demodulator 73 and demodulated. The signal output from the four-phase DPSK demodulator 73 is input to a digital channel signal separation circuit 74, where it is converted into an audio signal (signals arranged in audios 1 to 4 shown in FIG. 4) and an independent data channel signal. Separated. If the audio signal corresponds to the above-described video signal, it is output to a speaker (not shown).

The digital channel signal separating circuit 74 outputs the separated independent data channel signal to the newspaper data / related information separating circuit 81 constituting the decoder. The newspaper data / related information separation circuit 81 separates newspaper data and related information from the input signal, and outputs the newspaper data to the data descrambler 87.
The related information is output to the decoding circuit 82.

On the other hand, the memory 83 stores the data receiving device 6
Is stored in advance. When the contract content of the receiving device ID that matches the receiving device ID stored in the memory 83 is inputted as the related information, the decoding circuit 82 supplies the contract content to the contract condition comparing circuit 84, and the built-in memory 84A. Further, the decoding circuit 82 decodes the transmission channel scramble key transmitted as the related information, and outputs it to the on / off switching circuit 85.

Then, when the data identifier included in the common information described above is decoded from the input related information, the data identifier is supplied from the decoding circuit 82 to the contract condition comparison circuit 84. The contract condition comparison circuit 84
The input data identifier is compared with the contract contents already stored in the memory 84A. The contract content includes the data identifier of the newspaper data contracted in advance. The contract condition comparison circuit 84 determines the data identifier stored in the memory 84A and the decryption circuit 8 unless the contract fee is not paid and other prohibited conditions are not included in the contract contents.
When the data identifier supplied from 2 matches, a control signal for switching the on / off switching circuit 85 to the on state is output. Thus, the transmission channel scramble key output from the decoding circuit 82 is supplied to the PN generator 86 via the on / off switching circuit 85.

The PN generator 86 generates a pseudo random sequence corresponding to the input transmission channel scramble key. The data descrambler 87 descrambles the newspaper data supplied from the newspaper data / related information separation circuit 81 using the pseudo random sequence supplied from the PN generator 86 and outputs the descrambled newspaper data.

That is, in the data descrambler 87, the data scrambler 14 shown in FIG. 3 descrambles the scramble applied to the entire newspaper data.

The newspaper data output from the data descrambler 87 (which is selectively scrambled in predetermined information units) is supplied to the recording device 7 and recorded (stored) on the recording medium 8. ) Is done.

Thereafter, when the user terminal 9 is operated so as to read the newspaper data from the recording medium 8, the newspaper data recorded on the recording medium is read by the recording device 7 as shown in FIG. Are supplied to the information unit descramble processing unit 31 constituting the decoder of the receiving device 6.

In the information unit descramble processing section 31,
The newspaper data is descrambled using the information unit scramble key (this descrambling is performed in the same manner as in the data descrambler 87 in FIG. 5 described above). That is, the information unit descrambling processing unit 3
1, the information unit scramble processing unit 27 shown in FIG.
Thus, the scramble selectively applied to the newspaper data in a predetermined information unit is descrambled.

The information unit scramble key is transmitted together with, for example, the above-described transmission channel scramble key, decoded by the decoding circuit 82 (FIG. 5), and supplied to the information unit descramble processing unit 31. .

The newspaper data descrambled by the information unit descramble processing unit 31 is stored in the user terminal 9 (FIG. 1).
Is output to the monitor 10a or the printer 10b, and is displayed or printed out, respectively.

Next, FIG. 7 shows how newspaper data is scrambled and descrambled in the above data broadcasting system. In FIG. 7 (the same applies to FIGS. 8 and 9 to be described later), a downward-sloping diagonal line indicates a portion scrambled by the information unit scramble processing unit 27 (FIG. 2), and a downward-sloping diagonal line indicates data scramble. The part scrambled by the bra 14
Each is shown.

First, in the broadcasting station 3, as shown in FIG. 7A, newspaper data is stored in the information storage unit 26 of FIG. 2 in a predetermined information unit. The newspaper data of the predetermined information unit is processed by the information unit scramble processing unit 27 (FIG. 2).
The data is selectively scrambled, serialized, and output (FIG. 7B).

Here, FIG. 7B shows that, for example, information 2 is selected from newspaper data (information 1, 2,..., N) in a predetermined information unit, and scrambling is performed only on the information 2. It shows the appearance of being hung.

The newspaper data selectively scrambled is scrambled by the data scrambler 14 shown in FIG. 3 as shown in FIG. 7C and transmitted to the receiver via the satellite 4. Transmitted.

On the receiver side, as shown in FIG.
Data descrambler 87 of data receiving device 6 (FIG. 5)
, Newspaper data in the same state as the state shown in FIG. In the data descrambler 87, the scramble applied to the entire newspaper data is descrambled, whereby newspaper data in which only the information 2 is scrambled as shown in FIG. 7E is output.

The newspaper data (FIG. 7E) is supplied to the recording medium 8 via the recording device 7 and stored in a predetermined information unit as shown in FIG. 7F. .

When the newspaper data stored in the recording medium 8 is read therefrom as described above and supplied to the information unit descramble processing unit 31 (FIG. 6) via the recording device 7, the newspaper data is there. Is an information unit scramble processing unit 2
7 (FIG. 2) is descrambled. That is, in this case, information 2 of the newspaper data (information 1, 2,..., N) in a predetermined information unit is descrambled.

As a result, as shown in FIG. 7G, the original newspaper data of the predetermined information unit (newspaper data shown in FIG. 7A) is obtained.

Therefore, a recipient who cannot receive both the transmission channel scramble key and the information unit scramble key cannot see the newspaper data at all, and a recipient who can receive only the transmission channel scramble key ( Contractor) can view the newspaper data other than the information 2. Also, a receiver (subscriber) who can receive both the transmission channel scramble key and the information unit scramble key can view all the newspaper data.

As described above, a recipient who does not want to receive information 2 of the newspaper data in a predetermined information unit does not sign a contract for receiving information 2 when making a contract for receiving newspaper data. Then, the information provider enables only the transmission channel scramble key to be received for the subscribers who have not concluded the reception contract of the information 2 (hereinafter, appropriately referred to as partial subscribers). , So that the information unit scramble key cannot be received.
In addition, for a recipient who wishes to receive all newspaper data (hereinafter, referred to as a general contractor as appropriate), both the transmission channel scramble key and the information unit scramble key can be received.

Then, the reception fee for the partial contractor is set lower than the reception fee for the entire contractor.

By doing so, the subscriber pays the reception fee only for the newspaper data that he or she needs, thereby preventing the subscriber from feeling unfair. Can be.

Also, from the information provider's side, services can be provided in various forms according to the request of the contractor, that is, information (newspaper data) that can be received for each contractor
Can be set, and as a result, the number of subscribers can be increased, and further, the profit can be improved.

FIG. 8 shows a specific example of the newspaper data scrambled as described above. In FIG. 8, one piece of newspaper data (in FIG. 8, it is composed of data of one page, comprehensive page, business condition page,..., Local page,. For example, scrambling using an information unit scrambling key (hereinafter, appropriately referred to as partial scrambling) is applied to a business situation side and a local side, and further, the entirety thereof is scrambled using a transmission channel scrambling key (hereinafter, referred to as appropriate). The whole scramble).

In this case, the receiver can make a contract to receive the entire newspaper data or the newspaper data excluding the business situation and the local aspect.

Further, it is possible to make a contract to receive newspaper data excluding only the business situation or newspaper data excluding the local aspect. This means that the information unit scramble key used for partial scrambling applied to commercial data or local newspaper data is different as described above, and for those who have contracted to receive newspaper data excluding only commercial data, The transmission channel scramble key and the information unit scramble key for descrambling the local area can be received.If you have contracted to receive newspaper data excluding the local area only, the transmission channel scramble key and the commercial area scramble can be used. An information unit scramble key for decryption may be made receivable (in this case, a person who has contracted to receive the entire newspaper data is required to decrypt the transmission channel scramble key and the partial scramble on the commercial and local aspects. Should be able to receive the information unit scramble key ).

By setting the reception fee to, for example, a monthly fee, the same billing as in the case of collecting a subscription fee for a newspaper delivered by a newspaper delivery person can be performed.

Next, FIG. 9 shows a specific example of data scrambled as described above, similarly to FIG. FIG. 9 shows a case where data of a certain magazine, for example, is transmitted instead of newspaper data.

In the figure, one magazine data (FIG. 9)
For example, in the CM (commercial (advertisement)) and the main part of the magazine, for example, only the main part is scrambled partially and the whole part is not scrambled, so the receiver Can see only the commercials of the magazine, regardless of whether they are contractors or not.
In addition, the contractor can view not only the CM of the magazine but also the main part.

Therefore, in this case, the information provider of the magazine data (for example, a publisher) can show the CM of the magazine to an unspecified number of recipients (both subscribers and non-subscribers), As a result, an increase in the number of contractors or an increase in the number of purchasers of the magazine are expected to view the main part of the magazine. Therefore, sales of magazines can be improved.

As described with reference to FIG. 7, the partial contractor cannot view the information 2 of the newspaper data recorded on the recording medium 8, but thereafter desires to view the information 2. It is thought that it becomes. However, as described above, when newspaper data (programs) is received,
Since a scramble key (information unit scramble key) for descrambling the scramble (partial scramble) applied to the newspaper data is required, as described above, when the information unit scramble key is transmitted via the satellite 4, Before the contract, the information unit scramble key cannot be received, and therefore, the information 2 received before the contract and recorded on the recording medium 8 cannot be descrambled after the contract is concluded.

Therefore, as shown by a dotted line in FIG. 1, an information unit scramble key for descrambling a partial scramble is
For example, the data can be transmitted to the data receiving device 6 via a ground line such as a telephone line.

In this case, the information unit descrambling processing unit 31 (FIG. 6) of the data receiving device 6 performs the information unit scrambling for descrambling the partial scrambling applied to the information 2 received before the contract and recorded on the recording medium 8. When the key is received via the telephone line, the information 2 is descrambled using the key.

Therefore, in this case, it is possible to acquire the information unit scramble key later and view the information 2 for which no contract was made at the time of reception.

The received information unit scramble key can be recorded on the recording medium 8, so that the information 2 can be viewed at any time after the contract.

In addition to transmitting the information unit scramble key as described above, for example, as shown in FIG.
Storage media (recording media) such as C card 101 (others,
For example, it is also possible to store the information in an optical card or a memory card, and deliver it to the contractor. In this case, the contractor sets a storage medium such as the IC card 101 in which the information unit scramble key is stored in the data receiving device, reads out the information unit scramble key therefrom, and reads the information unit descramble processing unit 31 ( 6).

Next, as described above, if the information unit scramble key is transmitted via a satellite line or a telephone line, the non-contractor illegally obtains the information unit scramble key by eavesdropping or the like. It is possible to do. An IC storing an information unit scramble key
When the storage medium such as the card 101 is delivered, it is conceivable that a non-contractor obtains the IC card 101 from the contractor and thereby illegally obtains the information unit scramble key.

In order to prevent such unauthorized acquisition of the information unit scramble key, the IC card 101
In addition to the information unit scramble key, the receiving device ID is stored, and the reading of the information unit scramble key is read from the receiving device ID stored in the memory 83 of the data receiving device 6 (FIG. 5). Permission can be made only when the receiving device ID stored in the IC card 101 matches.

In this case, the data receiving device 6 is configured by providing an IC card interface device 111 on the device shown in FIG. 6, for example, as shown in FIG. The IC card interface device 111 is used for the IC card 101.
This is an interface for accessing the IC card 101, such as reading out the information unit scramble key stored therein.

Here, the IC card 101 includes a CPU 102, a ROM 103, and a RAM 1 as shown in FIG.
04. The ROM 103 stores, in addition to the system program and the application program, the receiving device ID of the data receiving device of the contractor to which the IC card 101 is delivered (in this case, the receiving device ID of the data receiving device 6 (in the memory 83 of FIG. 5) What is remembered))
And an information unit scramble key corresponding to the contract (an information unit scramble key for descrambling a partial scramble of the newspaper data for which the reception contract is concluded). CPU10
2 is configured to perform processing as described below according to a system program and an application program stored in the ROM 103. RAM1
Reference numeral 04 stores data necessary for the operation of the CPU 102.

The ROM 103 stores information unit scramble keys (information unit scramble keys (similarly, transmission channel scramble keys) necessary for a predetermined period (for example, one month) for illegal reception of newspaper data (programs). In order to prevent this, the IC card 10 is changed periodically or irregularly.
1 is delivered (for example, mailed) before newspaper data, which is partially scrambled using the information unit scramble key stored in the ROM 103, is transmitted. Also, if the contractor wishes to receive newspaper data outside the contract, the information unit scramble key for descrambling the partial scramble of the newspaper data is stored by contacting the information provider to that effect. , A new IC card,
Delivered from the information provider.

Next, the operation will be described with reference to the flowchart of FIG. IC card 101
When the newspaper data which is attached to the IC card interface device 111 and the partially scrambled newspaper data is input to the information unit descramble processing unit 31, first, in step S1, the information unit descramble processing unit 31 The CPU 102 is requested to output the information unit scramble key (information unit scramble key output request).

At this time, the descrambling unit 3
1 simultaneously outputs to the CPU 102 the information ID attached to the input newspaper data in a predetermined information unit.

Here, the newspaper data provided by the newspaper company, which is the information provider, is provided with an information ID for identifying each predetermined information unit in advance. On the other hand, in the ROM 103 of the IC card 101, an information unit scramble key is stored in association with an information ID attached to newspaper data of a predetermined information unit which can be used to partially scramble the information. Then, in step S5 described later, the information unit scramble key associated with the information ID output from the descrambling processing unit 31 in step S1 is read from the ROM 103 by the CPU 102.

When the CPU 102 receives the information ID together with the information unit scramble key output request from the descramble processing unit 31, the CPU 102 sends the information unit descramble processing unit 31 the receiving device ID in step S2.
Is output (reception device ID output request).

The information unit descramble processing unit 31
When receiving the receiving device ID output request from the PU 102,
The receiving device ID is read from the memory 83 shown in FIG.
Then, in step S3, the receiving device ID is
The information unit descramble processing unit 31 transmits the information to the CPU 102, and proceeds to step S4.

In step S4, the CPU 102 determines whether or not the receiving device ID stored in the ROM 103 matches the receiving device ID transmitted from the information unit descrambling unit 31. Step S
4, the receiving device I stored in the ROM 103
If it is determined that D does not match the receiving device ID transmitted from the information unit descrambling processing unit 31,
Step S5 is skipped and the process ends.

Therefore, for example, the non-contractor is more
If the user obtains the C card 101 and sets it in his / her own data receiving device, the receiving device ID and RO
Since the receiving device ID stored in M103 does not match, descrambling of partially scrambled newspaper data is not performed.

On the other hand, in step S4, the ROM 10
3 and the receiving device ID transmitted from the information unit descrambling processing unit 31, when it is determined that the receiving device ID matches the receiving device ID, the process proceeds to step S5. The information unit scramble key associated with the information ID output by the descramble processing unit 31 is read from the ROM 103, and
The information is output from the PU 102 to the information unit descrambling processing unit 31, and the processing ends.

Therefore, in this case, the information unit descramble processing section 31 descrambles the partial scramble applied to the input newspaper data of the predetermined information unit as described above.

As described above, when the receiver ID is stored in the IC card 101 together with the information unit scramble key, unauthorized acquisition of the information unit scramble key by eavesdropping can be prevented. However, it is possible to prevent the information unit scramble key from being provided unfairly to a non-subscriber.

When one household has a plurality of data receiving apparatuses, for example, an IC card storing the receiving apparatus ID of each of the plurality of data receiving apparatuses can be delivered to the household. . In this case, the IC
Even if the card is used for any of a plurality of data receiving devices,
Partial scramble descrambling becomes possible.

Although the present invention has been described for the case where the present invention is applied to a data broadcasting system for transmitting newspaper data, magazine data, and the like via a satellite line, the present invention is not limited to newspaper data and magazine data, and may be, for example, a book. Is applicable to a system for transmitting data of publications or multimedia data obtained by combining text data, image data, and audio data. Further, the present invention is applicable to a system (for example, CATV) for transmitting data via a transmission path such as a cable network, in addition to a satellite line.

In the present embodiment, the newspaper data whose entire scramble has been descrambled is once recorded in the recording medium 8 by the data receiving device 6, and then the partial scramble is descrambled. It is also possible to record the partially scrambled newspaper data on the recording medium 8.

Furthermore, in this embodiment, the broadcast station 3 applies partial scrambling to the newspaper data and then applies the entire scrambling. In addition, the broadcast station 3 applies the entire scrambling and then applies the partial scrambling. It is also possible to However, in this case, it is necessary for the data receiving device 6 to release the partial scramble and then release the entire scramble.

In this embodiment, the newspaper data of a predetermined information unit is selectively partially scrambled. In addition, when the newspaper data is divided into predetermined blocks, Partial scrambling can be selectively applied on a block basis. That is, for example, when the newspaper data is divided into file units, the newspaper data can be selectively partially scrambled in file units.

Further, in the present embodiment, the entire scrambling and the partial scrambling are applied only once to the newspaper data. In addition, the entire scrambling and the partial scrambling are applied to the newspaper data, for example, the double scrambling is performed. And it is also possible to make it multiply.

[0103]

As described above, according to the scramble device of the present invention, it is possible to provide only desired data to a contractor.

Further, according to the descrambling device of the present invention, the contractor can receive only desired data.

Further, a scramble key is read out from a storage medium storing a scramble key for descrambling scramble applied to the data in a predetermined block unit with respect to the data by the block unit scramble means. According to the case where descrambling is performed using the scramble key, even data received before the contract can be descrambled.

Further, the storage medium stores a predetermined ID in addition to the scramble key, and reading of the scramble key from the storage medium is performed by reading the ID stored in the ID storage means and the storage medium. According to the case of permitting only when the ID matches, the unauthorized use of the scramble key can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a data broadcasting system to which the present invention has been applied.

FIG. 2 is a block diagram showing a detailed configuration of a broadcasting station 3 in FIG.

FIG. 3 is a block diagram showing a detailed configuration of a broadcasting station 3 in FIG. 1;

4 is a digital channel signal multiplexing circuit 1 shown in FIG.
FIG. 5 is a diagram illustrating a format of digital channel data in FIG.

FIG. 5 is a block diagram showing a detailed configuration of a data receiving device 6 of FIG.

FIG. 6 is a block diagram showing a detailed configuration of the data receiving device 6 of FIG.

FIG. 7 is a diagram illustrating scrambling and descrambling performed in the data broadcasting system of FIG. 1;

FIG. 8 is a diagram illustrating newspaper data scrambled by a broadcasting station 3;

FIG. 9 is a diagram illustrating magazine data scrambled by a broadcasting station 3;

10 is a diagram illustrating a data broadcasting system in which descrambling is performed using an IC card 101. FIG.

FIG. 11 is a block diagram showing a configuration of a data receiving device 6 in which descrambling is performed using an IC card 101.

FIG. 12 is a flowchart illustrating an operation of the data receiving device 6 when descrambling is performed using the IC card 101.

[Explanation of symbols]

Reference Signs List 1 large computer, 2 workstation, 3 broadcasting station, 4 satellite, 5 receiving antenna, 6 data receiving device, 7 recording device, 8 recording medium, 9 user terminal, 10a monitor, 10b printer, 11
Encryption circuit, 12 independent data channel multiplexing circuit, 13 PN generator, 14 data scrambler,
15 digital channel signal multiplexing circuit, 16
4 phase DPSK modulator, 17 video signal / digital channel signal multiplexing circuit, 18 FM modulator, 19
Upconverter, 20 power amplifier, 21 transmission antenna, 26 information storage unit, 27 information unit scramble processing unit, 31 information unit descramble processing unit, 71 FM demodulator, 72 video / digital channel signal separation circuit, 73 4-phase DPSK Demodulator, 74 digital channel signal separation circuit,
81 Newspaper data / related information separation circuit, 82 Decoding circuit, 83 Memory, 84 Contract condition comparison circuit, 8
4A memory, 85 on / off switching circuit, 86 P
N generator, 87 Data descrambler, 101
IC card, 102 CPU, 103 ROM,
104 RAM, 111 IC card interface device

Claims (7)

[Claims] 1. A scrambling device for scrambling data, comprising: an overall scrambling means for scrambling the entire data; and a block for selectively scrambling the data in predetermined block units. A scrambling device comprising: a unit scrambling unit. 2. The scrambler according to claim 1, wherein said overall scrambling means scrambles the entire data scrambled in predetermined block units by said block unit scrambling means. 3. The data processing apparatus according to claim 1, wherein the data is data in a predetermined file unit, and the block-based scrambling unit scrambles the data in the file unit. Scramble device. 4. A descrambling device for descrambling data scrambled by the scrambling device according to claim 1, wherein the entire data is scrambled by the entire scrambling means. A descrambling unit for descrambling the scrambled data, and a block-based descrambling unit for descrambling scramble applied to the data by the block-based scrambling unit in a predetermined block unit. apparatus. 5. A storage device for storing data descrambled by the whole descrambling device, wherein the block unit descrambling device descrambles the data stored in the storage device. The descrambling device according to claim 4, wherein 6. A reading means for reading the scramble key from a storage medium storing a scramble key for descrambling scramble applied to the data in a predetermined block unit by the block unit scramble means. The descrambling device according to claim 4, wherein the descrambling unit performs descrambling using the scramble key read by the reading unit. 7. An apparatus according to claim 1, further comprising ID storage means for storing a unique ID, wherein said storage medium includes a predetermined ID in addition to said scramble key.
D, and reading of the scramble key from the storage medium is permitted only when the ID stored in the ID storage means matches the ID stored in the storage medium. The descrambling device according to any one of claims 4 to 6, wherein: