JP2003274385A - Apparatus and method for receiving scrambled broadcast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a user views after a contract update period, a guidance showing that the user can not view because the user does not contract is given to the user although the reason is that the audition period expires and the user can not know the real cause of the failure in viewing. <P>SOLUTION: A work key identification (KwID) before contract update is stored in a past work key identification memory 158. A control circuit 107 refers to the work key identification key (KwID) in the past work key identification memory 158 and then correctly decides that when a program before the contract update is reproduced from a storage device 103, the program can not be viewed because of non-contract, but because of the expiration of the audition period, thereby giving a guidance to the user by video, audio, etc. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiving device, and more particularly to a scramble broadcast receiving device and a scramble broadcast receiving method for descramble a scrambled broadcast signal.

[0002]

2. Description of the Related Art In recent years, television broadcasting services using artificial satellites have become widespread, and recently, digital broadcasting services using communication satellites and broadcasting satellites have been operating. Generally, satellite broadcasting systems operate pay broadcasting services by various methods such as channel units, program units, and time units.

EMM (Entitlement Management Messag
In the system for renewing the contract by e), the expiration date, the work key identification (KwID), and the work key (Kw) are updated by transmitting the EMM.

When a program sent by digital broadcasting is stored in a storage device in the form of a scrambled digital signal and played back, a program stored in the storage device before the contract renewal is to be reproduced after the contract renewal. , For example IC
Work key identification (KwID) stored in the card and work key identification (KwID) in ECM sent by broadcasting
Will be disagreement, and it will be judged as "non-contract" in which there is no contract.

For example, when a program stored in the storage device when there is a contract is reproduced and viewed beyond the contract renewal time, the work key identification (KwID ), The user was informed that he / she could not view because of the non-contract, because it was judged as "non-contract".

[0006]

As described above, in the conventional scrambled broadcast receiving apparatus, when the program accumulated in the accumulating apparatus when there is a contract is reproduced and viewed beyond the contract renewal time, the true viewing cannot be performed. Despite the fact that the viewing period has expired, the work key identification (KwID) does not match, so it is determined to be "non-contract", and the user is informed that viewing is not possible due to the non-contract.

Therefore, there is a problem that the user cannot know the correct cause of the unviewable. Therefore, the present invention stores the work key identification (KwID) before the contract renewal or the contract renewal date and time, and by referring to these, when the program before the contract renewal is played back from the storage device, it is not a cause of non-contract and is viewed. It is an object of the present invention to provide a scramble broadcast receiving apparatus and a scramble broadcast receiving method for correctly determining that a time limit has expired and guiding the user of this.

[0008]

In order to achieve the above object, in the present invention, scrambled program information in which a program is scrambled on the broadcast station side, and an encrypted data including a descramble key for descrambling the scrambled program information are encrypted. An input terminal for inputting encryption information, reference key identification information for identifying a decryption key for decrypting the encryption information, individual information for updating and setting the decryption key and the key identification information, and the input Key identification information storage means for storing the decryption key and the key identification information input from the end, and a pre-update key identification that stores the key identification information before the update when the individual information is input from the input end A key identification information comparison means for comparing the information storage means, the reference key identification information input from the input end, and the key identification information read from the pre-update key identification information storage means. When the comparison result by the key identification information comparing means indicates a match, the judging means judges that the program has expired, and the program has expired in accordance with the result of the judging means. There is provided a scramble broadcast receiving device, characterized in that the scramble broadcast receiving device comprises:

Further, in order to achieve the above object, in the present invention, an encrypted code including scrambled program information in which a program is scrambled on the broadcast station side at the input end, and a descramble key for descrambling the scrambled program. Encryption information, reference key identification information for identifying a decryption key for decrypting the encryption information, individual information for updating and setting the decryption key and key identification information, and key identification information storage Storing the decryption key and the key identification information input from the input end by means, and the pre-update key identification information storage means when the individual information is input from the input end, Storing the key identification information, and reading the reference key identification information input from the input end by the key identification information comparison means and the pre-update key identification information storage means. And comparing the key identification information with each other, the determining means determines that the program has expired when the comparison result by the key identification information comparing means indicates a match, and the guiding means There is provided a scrambled broadcast receiving method, characterized in that it comprises a step of informing that the program has expired in accordance with the result of the judging means.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Before describing the scramble broadcast receiving apparatus of the present invention, the configuration of a general broadcast system using satellites will be described below with reference to FIG. The center 1001 is generally a broadcasting station. In satellite broadcasting, broadcast signals are transmitted via broadcasting satellites. The receiving device 1002 of each home receives the broadcast signal by this satellite broadcast,
After demodulating the signal and decoding the data, the signal is output to the television receiver 1003 so that the user can receive the broadcasting service. The receiving device 1002 may be incorporated in the television receiver 1003. Receiver 10
02 may be equipped with a module for managing and controlling contract information of pay broadcasting. An IC card is generally used as this module.

There are various charging methods for pay broadcasting services, and generally, (1) a viewing contract form in which a contract is made for each channel at the monthly pole of broadcasting, (2) a contract form in which a contract is made for each program genre, (3) Viewing contract form in which a fee is paid in advance and charged for each program or viewing time, (4) Viewing contract in which the viewed program or time is stored in the receiving device 1002, and viewing history data is collected after viewing and charged There are forms.

The above four viewing contract modes (1) to (4) are viewing contract modes that can be realized by a unidirectional system from the center 1001 to the receiving device 1002.
In the viewing mode of (4) above, it is necessary to perform bidirectional information transmission.

Generally, in a pay broadcasting system based on satellite broadcasting, a telephone modem is built in the receiving device 1002, and the receiving device 1002 is connected to a public line network 1004 to provide a center 1001 and a receiving device 10.
02 communicates and receives the viewing history data from the receiving device 1002.
Sent to the center 1001. The latter two viewing contract forms are called pay-per-view (PPV) viewing because charges are charged according to the program viewed or time.

From the center 1001 to the receiving device 1002,
Individual information is transmitted according to the contract contents of the user. Generally, it is called EMM (Entitlement Management Message) data, and an EM to which an ID number unique to the receiving device is added.
The M data is transmitted from the center 1001 to each receiving device 1002 after being multiplexed with the broadcast signal. Receiver 1
In 002, the EMM data of itself is received from the unique ID, the contract information is stored in the receiving device 1002, and the user receives the pay broadcasting service based on the contract information.

Next, the EMM will be described with reference to FIG. FIG. 11A is a diagram showing an example of the EMM transmitted from the center 1001 to the receiving device 1002. The ID 1101 is an ID for identifying the receiving device 1002, and the EMM is transmitted to the receiving device 1002 that matches this ID. The expiration date 1102 indicates the expiration date of the contract content. For example, the contract is renewed and the expiration date is updated every year. The contract information 1103 indicates the contract content of the user who uses the receiving apparatus 1002, and whether or not the viewing is possible is determined according to the contract content. Work key identification (Kw
An ID) 1104 and a work key (Kw) 1105 are a key for decrypting an ECM (Entitlement Control Message) to be described later and this identification.

Generally, in the EMM, the range from the expiration date 1102 to the work key (Kw) 1105 is encrypted with an individual key (master key (Km)) to prevent the EMM from being tampered with by an unauthorized person. Alteration detection 1106, which is inspection data, is added and transmitted.

In general, in order to ensure the security of the system and due to the contractual nature, it is necessary to update the key periodically. For example, the contract renewal interval is 1
When the year is set, the expiration date of the EMM is set and the expiration date 110
2, work key identification (KwID) 1104, work key (K
w) 1105 is updated every one year.

The pay broadcasting program is scrambled and transmitted from the center 1001 to the receiving apparatus 1002. In addition, in a pay broadcast program, E is common to all receiving devices 1002.
CMs are multiplexed and transmitted, and a key for descrambling the program, attribute information of the program, and contract information to be referred to are transmitted. In each receiving device 1002, in order to watch a pay broadcast, the individual contract information set in the EMM and the reference contract information transmitted in the ECM are compared with each other to determine whether the viewing is possible, perform a billing process, You can unscramble and watch.

Next, the ECM will be described with reference to FIG. FIG. 11B is a diagram showing an example of the ECM transmitted from the center 1001 to the receiving device 1002. The ECM is sent by the broadcasting station together with the program, and E
The program viewing control is performed by comparing with the contract information set in the MM. The ECM is encrypted and transmitted in the range from the time information 1108 to the scramble key (Ks) 1111 by using the work key (Kw) 1105 preset in the receiving apparatus 1002 by the EMM as a key by contract.

The work key identification 1107 is a work key (K
w) Identification for identifying 1105. Time information 1
Reference numeral 108 indicates the time when the program is broadcast. The reference contract information 1109 is information for comparison and reference with the contract information 1103 set in the receiving device 1002 by the EMM in advance, and the contract determination (whether contracted and viewable or non-contracted) is made by comparing both. There is a judgment of whether or not viewing is possible).

The program information 1110 indicates, for example, the program number and attributes. The scramble key (Ks) 1111 is
This is a key for descrambling the program to be scrambled, and is used by the receiving device 1002 after confirming the reference contract information 1109 and the like and performing a billing process, and descrambles the program scrambled and transmitted to the user. Can watch the program.

The falsification detection 1112 is inspection data for preventing the ECM from being falsified by an illegal person. (First Embodiment) A first embodiment of the scrambled broadcast receiving apparatus of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a scramble broadcast receiving apparatus according to the present invention. Receiver 100
2 is a receiving device main body 10 that realizes the basic part of the receiving function.
0 and an example in which the IC card 150 is used as a module that realizes the pay broadcast reception control function. Receiver 1
Reference numeral 002 shows an example including the receiving device main body 100 and the IC card 150, but the receiving device may have a configuration having all the functions, and is not limited to the configuration shown in this example.

The IC card 150 is an IC for each IC card.
The D number is stored in the ID memory 153. Power on
When the IC card 150 is attached to the receiving device body 100, the receiving device body 100 is
The ID number is read from the ID memory 153 in 0 and stored in the ID memory 108 in the receiver main body 100.

A broadcast signal obtained by frequency down-converting the signal received by the antenna is input to the terminal 101. The tuner 102 performs signal selection, demodulation, and data error correction processing. Generally, broadcast signals are QPSK modulated or 8
Phase PSK, Reed-Solomon error correction code, convolutional code, etc. are used as the error correction method.

The tuner 102 outputs a demodulated and error-corrected packet format signal, and the packet format data is generally in accordance with the ISO13818-1 standard (MPEG).
2 system standard data is used, and the packet data includes a plurality of broadcast signals and control data.

The packet signal output from the tuner 102 is input to the descrambler 104. Storage device 1
Reference numeral 03 denotes a device for temporarily storing programs, which is a large-capacity storage device such as a hard disk, and the present invention will be described on the premise of a storage service having the storage device 103. However, there may be a case where the storage device is legally or illegally provided outside the receiving device.

The storage device 103 is a program storage device.
Store programs in a scrambled state. Further, in a pay broadcast program, the ECM multiplexed in the program is also stored. When viewing the stored program later, the program and the ECM are played back from the storage device 103 for viewing.

The descrambler 104 is a circuit for descrambling the selected pay broadcast program. The descrambled signal is input to the decoder circuit 105.
The decoder circuit 105 performs a broadcast signal separation process and a video / audio signal decoding process. It also separates the multiplexed control signals.

In the control signal receiving circuit 106, the program selection information and the like multiplexed in the broadcast signal are separated from the broadcast signal and output to the control circuit 107, and the control circuit 107 performs program selection processing. In addition, the control signal receiving circuit 106
The ECM and EMM data multiplexed in the program is separated.

In the display circuit 113, characters, graphics, etc. for performing a display interface with the user, such as an operation menu and a message, are superimposed on the decoded video / audio signal, and T
After the V signal is modulated, it is output to the terminal 114. A television receiver is connected after the terminal 114, and the user can watch the broadcast signal.

The key input circuit 110 serves as an operation interface for the user and outputs selection contents such as program selection by the user to the control circuit 107. In the control circuit 107, the menu of the program is displayed to the user on the display circuit 113 from the received program selection information, and the user selects the program and inputs the selection information to the key input circuit 110.

The control circuit 107 controls the tuner 102, the descrambler 104, the decoder circuit 105, etc.
The program selected by the user is output to the terminal 114. When the EMM data is received while watching the program, the control circuit 10
7, the ID number stored in the ID memory 108 is used to perform the reception processing of only the EMM data of the user. The received EMM data is sent to the module control circuit 152 in the IC card 150 via the I / Fs 109 and 151. The IC card 150 decodes the received EMM data, and the contract information is contract information memory 154. Further, the expiration date is stored in the expiration date memory 156, and the work key (Kw) and the work key identification (KwID) are stored in the work key / work key identification memory 157. The work key (Kw) and the work key identification (KwID) may be stored in different memories.

When the received broadcast program is a pay broadcast program, the ECM is multiplexed with the pay broadcast program. EC
M is data common to all receivers, and is composed of program information such as a program attribute and a descramble key for descrambling. The ECM data is sent from the control circuit 107 to the IC.
For the module control circuit 152 in the card 150,
The module control circuit 152 sends the work key identification indicated by the ECM to the work key identification (KwID) stored in the work key / work key identification memory 157, which is sent via the I / Fs 109 and 151. Determine whether or not
When it is determined that they match, it is regarded as a basic “contract”, and the work key (Kw) to be stored is used to decrypt the ECM. If it is determined that they do not match, it is considered a basic “non-contract”.

Further, the present time in the ECM and the expiry date of the contract stored in the expiry date memory 156 are checked, and the EM is checked.
The contract information in the contract information memory 154 set by the M data is compared with the reference contract information in the ECM, the detailed contract is confirmed, and whether or not the pay broadcast program can be viewed is determined.

If it is viewable, the scramble key (Ks) in the ECM data is sent to the control circuit 107 in the receiving device main body 100. The control circuit 107 gives a descramble key to the descrambler 104 to descramble the pay broadcast program, so that the pay broadcast program can be viewed.

The past work key identification (KwID_Old) memory 158 in the IC card 150 stores the work key identification before the update when the work key and the work key identification are updated by the contract update. Since there may be multiple updates, a plurality of pre-update work key identities may be stored.

FIG. 2 is a flow chart of processing in the receiving apparatus 1002 for the EMM transmitted from the center 1001. FIG. 2A shows an E of the receiving device body 100.
It is a flowchart of the process with respect to MM. As described above, when the power is turned on or when the IC card 150 is attached to the receiving device body 100, the receiving device body 100
Reads the ID number from the ID memory 153 in the IC card 150, and the ID memory 108 in the receiver main body 100 is read.
Remember.

The receiving device main body 100 receives the program tuning in response to the user's tuning operation (step 201). As a result, it becomes possible to receive the EMM multiplexed in the broadcast program signal. The receiving device main body 100 determines whether EMM is detected from the broadcast program signal received in step 201 (step 202). In step 202, if the EMM is not detected, the reception process for the EMM ends, but if the EMM is detected, the EMM ID and ID.
The ID stored in the memory 108 is compared (step 203).

The receiving device main body 100 determines whether or not the IDs match in step 203 (step 204).
If the IDs match in step 204, the receiving device body 100 sends the EMM having the matching ID to the receiving device body 1.
00 to the IC card 150 (step 20)
5).

FIG. 2B is a flow chart of processing for the EMM of the IC card 150. IC card 150
Receives the EMM transmitted from the receiving apparatus main body 100 in step 205 (step 206). IC card 1
The 50 uses the key unique to the IC card 150 to decrypt the EMM received in step 206 (step 20).
7). The key unique to the IC card 150 is generally called a master key (Km).
Although it is a unique key, it is not directly related to the present invention, and therefore its detailed description is omitted.

The IC card 150 determines whether there is a contract change from the EMM decrypted in step 207 (step 208). IC card 150, step 2
As a result of the judgment of 08, if it is judged that there is no change, EM
Although the reception process for M ends, the next update process is performed when it is determined that there is a change.

First, in performing the update process, the work key identification (KwID) currently stored in the work key / work key identification memory 157 is replaced with the past work key identification (KwID_).
Old) In the memory 158, the past work key identification (KwID_
Old) is stored (step 209).

Next, the IC card 150 has changed E
New work key (Kw) in MM, work key identification (Kw
The ID) is stored in the work key / work key identification memory 157 (step 210).

Next, the IC card 150 stores the new expiration date in the EMM in the expiration date memory 156 and the contract information in the contract information memory 154 (step 211). Figure 3
Is an ECM when the receiving device 1002 selects a pay broadcast program in the receiving device 1002 or reproduces a stored program stored in the storage device 103 from the storage device 103.
It is a flowchart of the process with respect to.

The receiving device main body 100 selects a pay broadcast program received by the antenna or reproduces a program stored in the storage device 101 (step 301). Next, the receiving device body 100 detects the ECM (step 30
2) When the ECM is detected, the ECM is sent to the receiving device body 10
0 to the IC card 150 (step 30)
3). When the ECM is not detected in step 302, the step 302 is repeated to continue to detect the ECM.

The IC card 150 is the receiving device main body 100.
From ECM (step 351). Next, the IC card 150 receives the work key identification (KwID) 1107 in the ECM received in step 351 and the work key identification (KwID) stored in the work key / work key identification memory 157.
ID) is compared (step 352).

The IC card 150 determines the work key identification (KwI) in the ECM according to the result of the comparison in step 352.
D) 1107 and work key / work key identification memory 157
It is determined whether or not the work key identification (KwID) stored in (1) matches (step 353).

In the IC card 150, the work key (Kw) stored in the work key / work key identification memory 157 when it is determined that the judgment results in step 353 match.
The ECM is decrypted using the key as the key (step 354), and when it is determined that they do not match, the past work key identification (KwID_
Old) The past work key identification (KwID_Old) stored in the memory 158 is read (step 36).
0).

The IC card 150 compares the current time of the ECM decrypted in step 354 with the expiration date stored in the expiration date memory 156 (step 355). I
The C card 150 determines whether or not it is within the expiration date according to the result of comparison in step 355 (step 35).
6). When the IC card 150 determines in step 356 that the validity period has expired, the IC card 150 compares the reference contract information 1109 in the ECM with the contract information stored in the contract information memory 154 (step 357). On the contrary, when the IC card 150 determines in step 356 that the expiration date is not within the expiration date, the IC card 150 transmits an expiration date error to the receiving device main body 100.

The IC card 150 judges contract / non-contract according to the result of comparison in step 357 (step 3
58) When it is determined that the contract is made, the scramble key (Ks) is transmitted to the receiving device (step 359),
Return to step 351. On the contrary, if it is determined in step 358 that the contract is not made, a non-contract error is transmitted to the receiving device main body 100 (step 363), and step 35 is executed.
Return to 1.

After the past work key identification (KwID_Old) stored in the past work key identification (KwID_Old) memory 158 is read in step 360,
This past work key identification (KwID_Old) and ECM
The work key identification (KwID) 1107 is compared (step 361). When they match in step 361, it is determined that the program that had been contracted in the past has been accumulated, and in step 362, an expiration date error is transmitted to the receiving device body 100, and then the process returns to step 351. In step 361, the work key identification (KwI
Work key identification (KwID_Ol) that matches D)
When d) does not exist, a non-contract error is transmitted to the receiving device main body 100 in the previous step 363, and then the process returns to step 351.

After step 303, the receiving device main body 100 receives a signal from the IC card 150 (step 3).
04). In step 304, the receiving device main body 100 performs the IC
When the signal received from the card 150 is the scramble key (Ks) transmitted in step 359, the received scramble key (Ks) is set in the descrambler 104 to watch the descrambled program.

When the signal received from the IC card 150 in step 304 is the expiration date error transmitted in step 362, the receiving device main body 100 internally displays an expiration date error based on the received expiration date error. The control circuit 107 controls the display circuit 113 (step 306). As a result, a screen as shown in FIG. 4A is displayed on the display device such as a television receiver for guiding the viewer of the error of the expiration date.

When the signal received from the IC card 150 in step 304 is the non-contract error transmitted in step 363, the receiving device main body 100 internally displays the non-contract error based on the received non-contract error. The control circuit 107 controls the display circuit 113 (step 30).
7). As a result, a screen for guiding the viewer of a non-contract error as shown in FIG. 4B is displayed on a display device such as a television receiver.

In the IC card 150, a work key (Kw) / work key (KwID) identification memory 157 and a past work key identification (KwID_Old) memory 158 are formed, and a work key identification (KwID) in the ECM is stored. Work key (Kw) / work key (KwID) identification memory 1
By causing the module control circuit 152 to execute the control for comparing and determining the work key identification (KwID) stored in 57, it becomes possible to seal the data and function in the IC card. This can improve security against unauthorized use and the like.

(Second Embodiment) A second embodiment of the scrambled broadcast receiving apparatus of the present invention will be described in detail below with reference to FIGS. 5 to 8. FIG. 5 is a diagram showing the configuration of the second embodiment of the scramble broadcast receiving device of the present invention. The receiving apparatus 1002 shows an example in which the receiving apparatus main body 100 that realizes the basic part of the receiving function and the IC card 150 is used as a module that realizes the pay broadcast reception control function. The receiving device 1002 is the receiving device main body 1
00 and IC card 150 are shown as an example, but the receiving apparatus may have all the functions and is not restricted to the structure shown in this example.

Descriptions of contents overlapping with the above-described embodiment will be omitted. FIG. 5 is different from FIG. 1 in that an IC card 150 newly has a past time memory 501. The past expiration date memory 501 is a memory for storing the expiration date before the contract is renewed, and stores the past expiration date when the contract is renewed by the EMM. Figure 6
7 is a flowchart of processing performed by the receiving device 1002 on an EMM transmitted from the center 1001. Figure 6
(A) is a flowchart of a process for the EMM of the receiving device body 100. This FIG. 6 (a) is the same as FIG. 2 (a). FIG. 6B is a flowchart of the process for the EMM of the IC card 150. 6B is different from FIG. 2B in that the process of step 601 is inserted between step 210 and step 211. In this step 501, the expiration date before renewal is stored in the past expiration date memory 501 when the contract is renewed.

In FIG. 7, in the receiving device 1002, the receiving device 1002 selects a pay broadcast program, or the storage device 1
23 is a flowchart of processing for ECM when the stored program stored in 03 is reproduced from the storage device 103.

FIG. 7 is different from FIG. 3 in that the process of step 751 is replaced by the process of step 363 and the process of step 701 is replaced by the process of step 306.
When the IC card 151 agrees in step 361, it determines that the program that had been contracted in the past has been accumulated, and in step 751 the expiration error and the validity before update read from the past expiration memory 501 are detected. After transmitting the deadline date to the receiving device main body 100, the process returns to step 351.

When the signal received from the IC card 150 in step 701 is the expiration date error transmitted in step 751 and the expiration date before the update, the receiving device main body 100 receives the expiration error and the update date before the update. Display expiration errors and expiration dates before renewal based on the expiration date. As a result, a screen for guiding the expiration date of the program to be viewed and the expiration date before updating as shown in FIG. 8 is displayed on a display device such as a television receiver.

(Third Embodiment) Hereinafter, a third embodiment of the scrambled broadcast receiving apparatus of the present invention will be described in detail with reference to FIG. FIG. 9 is a diagram showing the configuration of the third embodiment of the scramble broadcast receiving device of the present invention. The receiving apparatus 1002 shows an example in which the receiving apparatus main body 100 that realizes the basic part of the receiving function and the IC card 150 is used as a module that realizes the pay broadcast reception control function. The receiving device 1002 and the receiving device main body 100
An example including the C card 150 is shown, but there is a configuration in which the receiving device has all the functions and the like, and the configuration is not limited to the configuration shown in this example.

Descriptions of contents overlapping with the above-described embodiment will be omitted. In FIG. 9, description of the same configuration as in FIG. 5 is omitted. 9 is different from FIG. 5 in that a clock 901 and an IC card 150 are provided in the receiving device main body 100.
The difference is that a time memory 902 is provided inside. Clock 9
01 is connected to the control circuit 107 and is sequentially updated by the time information transmitted from the broadcasting station. The receiving device main body 100 periodically sends time information to the IC card 150 and stores the current time in the time memory 902 in the IC card 150. Note that this time also includes date information. From the above, the apparent IC card 15
A clock can be formed in zero.

When the contract is renewed by the EMM, the contents of the time memory 902 are stored in the past expiration date memory 501 so that the time at the time of contract renewal is stored as the past expiration date. Then, as the expiration date stored in the time memory 902, a screen for guiding the expiration date of the program to be viewed and the expiration date before update as shown in FIG. 8 is displayed on a display device such as a television receiver. Is displayed.

In the third embodiment, the receiver body 1
The example in which the clock 901 is formed in 00 is shown.
1 may be provided in the IC card 150.
Although the past expiration date memory 501 is left as it is in FIG. 9, it may be omitted. In any of the embodiments of the present invention, as a guiding means for guiding the user, in addition to outputting a video signal for guiding, the user "cannot watch because the expiration date has passed". It is also possible to provide a dedicated LED for guiding the user on the front of the set top box and turn on this LED to guide the user. Alternatively, the user may be guided by playing a voice.

[0065]

As described above, according to the present invention,
The work key identification (KwID) before the contract renewal is stored, and by referring to these, when the program before the contract renewal is played back from the storage device, it is correctly determined that the viewing expiration has been caused instead of the non-contract. Since the user is guided, it is possible to know the correct reason why the user cannot watch.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a scramble broadcast receiving device of the present invention.

FIG. 2 shows a center 1001 of a receiving device 1002.
2A is a flowchart of processing performed on the EMM transmitted from the device, FIG. 2A is a flowchart of processing performed on the EMM of the receiving device main body 100, and FIG.
The flowchart of the process with respect to EMM of 0.

FIG. 3 is a diagram showing a configuration of a receiving device 1002.
2 is a flowchart of processing for ECM when a pay broadcast program is selected by 2 or a stored program stored in the storage device 103 is reproduced from the storage device 103.

FIG. 4 (a) is a diagram for explaining a screen for guiding a viewer of an error of expiration, and FIG. 4 (b) is a diagram for explaining a screen for guiding a viewer of a non-contract error.

FIG. 5 is a diagram showing a configuration of a second embodiment of a scrambled broadcast reception device of the present invention.

FIG. 6A is a flowchart of a process for the EMM of the receiving device body 100. FIG. 6B is a flowchart of the process for the EMM of the IC card 150.

FIG. 7 shows a receiving device 1002 in which the receiving device 100
2 is a flowchart of processing for ECM when a pay broadcast program is selected or a stored program stored in the storage device 103 is reproduced from the storage device 103.

FIG. 8 is a diagram for explaining a screen for guiding the expiration date of a program to be viewed and the expiration date before updating.

FIG. 9 is a diagram showing the configuration of a third exemplary embodiment of a scramble broadcast receiving device of the present invention.

FIG. 10 is a diagram showing the overall configuration of a general broadcasting system using satellites.

FIG. 11: EMM transmitted from the center to the receiving device,
The figure which shows ECM.

[Explanation of symbols]

100 ... Receiving device main body, 101, 114 ... Terminal, 102
... tuner, 103 ... storage device, 104 ... descrambler, 105 ... decoder circuit, 106 ... control signal receiving circuit, 107 ... control circuit, 108 ... ID memory, 110 ...
Key input circuit, 113 ... Display circuit, 150 ... IC card, 152 ... Module control circuit, 153 ... ID memory, 154 ... Contract information memory, 156 ... Expiration date memory, 157 ... Work key / work key identification memory, 158 ...
Past work key identification (KwID_Old) memory, 10
9, 151 ... I / F, 501 ... Past time memory, 901
... Clock, 902 ... Time memory, 1001 ... Center, 10
02 ... Receiving device, 1003 ... Television receiver, 10
04 ... Public line network, 1101 ... ID, 1102 ... Expiration date, 1103 ... Contract information, 1104 ... Work key identification (K
wID), 1105 ... Work key (Kw), 1106 ... Alteration detection, 1107 ... Work key identification, 1108 ... Time information, 1109 ... Reference contract information, 1110 ... Program information, 1
111 ... Scramble key (Ks), 1112 ... Alteration detection.

Claims (8)

[Claims] 1. A scrambled program information in which a program is scrambled on a broadcast station side, encrypted encrypted information including a descramble key for descrambling, and a decryption key for decrypting the encrypted information are identified. Reference key identification information for inputting, an input end to which the individual information for updating and setting the decryption key and the key identification information is input, and a key identification for storing the decryption key and the key identification information input from the input end An information storage unit, a pre-update key identification information storage unit that stores the key identification information before update when the individual information is input from the input end, and the reference key identification information input from the input end , When the result of the comparison by the key identification information comparison means for comparing the key identification information read from the pre-updated key identification information storage means with the key identification information comparison means Scrambled broadcast reception, characterized by comprising: a judging means for judging that the program has expired, and a guiding means for guiding that the program has expired, according to the result of the judging means. apparatus. 2. An encrypted information decryption unit that decrypts the encrypted information using the decryption key, and the descramble key included in the encrypted information decrypted by the encrypted information decryption unit. 2. The scramble broadcast receiving apparatus according to claim 1, further comprising a descramble means for descramble the scramble program information. 3. The pre-update key identification information storage means includes first pre-update key identification information storage means for storing first key identification information, and second key identification information different from the first. 2. The scrambled broadcast receiving apparatus according to claim 1, further comprising a second pre-update key identification information storage means for storing. 4. The individual information includes expiration date information indicating an expiration date of the key and the key identification information, and the expiration date information included in the individual information input from the input end is extracted. Expiration date storage means for storing the stored expiration date, and a pre-update expiration date for storing the expiration date information before the update when the individual information for updating and setting the key and the key identification information is input from the input end. An information storage unit, and the guide unit guides that the program has expired on the date corresponding to the expiration date information before the update according to the result of the determination unit. The scrambled broadcast receiving device according to claim 1. 5. A clock means for holding and outputting a current date, and when the individual information for updating and setting the key and the key identification information is input from the input end, the current date is stored as an update date. Update date storage means, and update date storage means for storing the current date from the clock means as the update date when the individual information for updating and setting the key and the key identification information is input from the input end. 2. The scrambled broadcast receiving apparatus according to claim 1, wherein the guide unit guides that the program has expired on the update date according to the result of the determination unit. 6. The expiration date storage means includes a first expiration date storage means for storing a first expiration date storage means and a second expiration date storage means for storing a second expiration date storage means different from the first expiration date storage means. The scrambled broadcast receiving apparatus according to claim 4 or 5, further comprising an expiration date storage means. 7. The key identification information storage means, the pre-update key identification information storage means, the means for storing the key, the key identification information comparison means and the determination means are configured in an IC card. The scrambled broadcast receiving device according to claim 1. 8. A scrambled program information in which a program is scrambled at a broadcasting station side at an input end, encrypted encrypted information including a descramble key for decrypting the scramble,
A step of inputting reference key identification information for identifying a decryption key for decrypting the encryption information, individual information for updating and setting the decryption key and the key identification information, and a key identification information storage means, Storing the decryption key and the key identification information input from the input end, and the pre-update key identification information storage means when the individual information is input from the input end, the key identification information before update And a step of comparing the reference key identification information input from the input end with the key identification information read from the pre-update key identification information storage means by a key identification information comparison means, The means for judging that the program has expired when the comparison result by the key identification information comparing means indicates a match, and the result of the judging means by the guiding means Scrambled broadcast receiving method, characterized in that said program comprises the step of guiding that expired view according.