JP2001333412A - Pay broadcast receiver and pay broadcast time shift viewing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain charging on a pay-per-view program in timing desired by a broadcast station. SOLUTION: In the case of time-shift viewing of a pay-per-view program, a view propriety discrimination section 26 inquires of a broadcast station 1 about time-shift viewing of the pay-per-view program via a modem 43. The broadcast 1 transmits an EMM denoting the propriety of viewing to a receiver in response to this inquiry. The view propriety discrimination section 26 outputs a scramble key when the viewing is permitted as a result of the inquiry and transmits purchase intention of the program to the broadcast station 1. Thus, the charging is imposed. The broadcast station 1 receives no disadvantage by the time-shift viewing of the pay-per-view program pay-per-view program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pay-broadcast receiver and a pay-broadcast time-shift viewing method for recording a scrambled pay-broadcast program as it is, and descrambling and viewing the program during reproduction.

[0002]

2. Description of the Related Art Conventionally, paid digital broadcasting using a satellite (BS) has been performed. In paid BS digital broadcasting, programs to be broadcast are scrambled. The viewer is given a scramble key for descrambling by subscribing to the broadcast station. By descrambling the received signal using the scramble key, it is possible to view the program.

In a broadcasting station, a scramble key is multiplexed with a broadcast signal and transmitted. In this case, the scramble key is
ECM (Entitlem) along with information on program viewing conditions
entControl Message).

On the other hand, a receiver on the viewer side has a descrambler for descrambling a received signal,
A card unit (IC card) for generating a scramble key required for descrambling is provided. The IC card is provided with individual information (hereinafter referred to as EMM (Entitlement Management Mes
sage)). The EMM may be transmitted from a broadcasting station and taken into an IC card.

[0005] In the IC card, a scramble key is obtained from the ECM included in the received signal, and whether or not viewing is possible for each program is determined from the ECM and the held EMM. The scramble key is supplied from the IC card to the descrambler only when the program can be viewed. This allows
Only programs permitted to be viewed according to the contract conditions can be viewed.

[0006] By the way, in pay broadcasting, not only tier (fixed-rate) programs but also pay-as-you-go (PPV (pay-per-view)) programs are broadcast. In the pay-per-view, the viewer can select purchase or non-purchase for each program. To charge for a purchased program, I
A viewing information memory is provided in the C card. When the viewer selects a pay-per-view program and decides to purchase, the IC card uses information (hereinafter referred to as viewing information) for specifying the program from the ECM of the pay-per-view program.
Is stored in the memory, and the descramble key is output so as to be viewable. The IC card transmits viewing information to a broadcasting station via, for example, a telephone line. Broadcasting stations pay for viewing fees based on the collected viewing information.

[0007] By the way, in pay broadcasting, it is conceivable that a broadcast program is recorded once, reproduced and viewed later. In this case, from the viewpoint of copyright protection, the program to be recorded is recorded while being scrambled.
However, the EMM may be changed by a broadcasting station. When the changed EMM is transmitted from the broadcasting station, the EMM in the IC card on the receiver side is updated. A recorded pay broadcast program before the EMM change may not be able to be decoded using the EMM after the change.

Therefore, it is conceivable to record the EMM at the time of broadcast of the program in a recording device together with the broadcast program. I
An EMM input / output function is added to the C card, and it is determined whether such a time-shift viewing or a real-time viewing is performed, and an EMM used for decoding a program is reproduced from a recording device and stored in the IC card. It switches with the one that it holds.

At the time of reproduction, the ECM of the reproduced program is decoded using the reproduced EMM, and the reproduced EMM and EC are decoded.
A viewing determination is performed based on M, and when a determination result indicating that the contracted program (or channel) is viewable is obtained, a key for descrambling (decoding) the program is extracted from the ECM and viewed. enable. This allows the subscriber to watch the program in a time-shifted manner while preventing unauthorized viewing.

[0010] However, in the PPV, after the program is viewed, the viewing information is transmitted to the broadcasting station and the charging is performed. Therefore, in the time shift viewing, it is conceivable that the timing at which the viewing information is actually transmitted to the broadcasting station is significantly delayed from the timing of collecting the fee intended by the broadcasting station, as compared with the time of the real time viewing. This is extremely inconvenient for broadcasters. In some cases, it is also conceivable that a broadcast station does not already exist at the time of time shift viewing.

[0011]

As described above, conventionally, when a pay-per-view program is viewed in a time-shifted manner, collection of a fee may be significantly delayed as compared with broadcasting, which is extremely inconvenient for a broadcasting station. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and enables a broadcast station to view a pay-per-view program in a time-shifted manner without suffering a disadvantage by making it possible to limit the sales period of the pay-per-view program. It is an object of the present invention to provide a pay-broadcast receiver and a pay-broadcast time-shift viewing / listening method which can perform the time-shift viewing.

[0013]

According to a first aspect of the present invention, there is provided a pay broadcast receiver comprising: program data; program information having a scramble key used for scrambling the program data and information for specifying the program. Receiving means for receiving, a work key used for encrypting the program information and individual information having information according to the content of the viewing contract;
When the program data of the pay-per-view program is reproduced from the recording means in which the program data received by the receiving means is recorded and time-shifted and viewed, a broadcast station is inquired as to whether or not the reproduced pay-per-view program can be viewed, and based on a response result of the inquiry. The pay-per-view program according to claim 4 of the present invention, wherein said pay-broadcast receiver uses program data and scrambled program data. Receiving means for receiving program information having a scramble key and information for specifying a program, and individual information having a work key used for encrypting the program information and information corresponding to the contents of a viewing contract. Transmitting means for transmitting viewing information for charging to a broadcasting station along with recording of a pay-per-view program; A case in which the individual information is stored together with the information indicating the number of times of viewing when the view-view program is recorded, and the program data of the pay-per-view program is reproduced from the recording means in which the program data received by the receiving means is recorded and time-shifted and viewed. And a viewability determining means for determining whether or not the reproduced pay-per-view program can be viewed based on the individual information and the information indicating the number of times of viewing stored in the storage means. The pay-time broadcast time-shift viewing method according to the first aspect of the present invention includes a program data, a program information having a scramble key used for scrambling the program data and information for specifying the program, and a work used for encrypting the program information. A procedure for receiving individual information having information corresponding to the key and the content of the viewing contract, and When the program data of the pay-per-view program is reproduced from the recorded recording means and time-shifted and viewed, the broadcast station is inquired as to whether or not the reproduced pay-per-view program can be viewed, and based on the response result of the inquiry, the viewing of the reproduced pay-per-view program is performed. The pay-per-view broadcast time-shift viewing method according to claim 6 of the present invention specifies program data, a scramble key used for scrambling the program data, and a program. Receiving the program information having the information for performing the program, the work key used for encrypting the program information, and the individual information having the information corresponding to the contents of the viewing contract. Transmitting the viewing information for billing to the broadcasting station by using the pay-per-view program. A procedure for storing the separate information together with information indicating the number of views,
When the program data of the pay-per-view program is reproduced from the recording unit that records the received program data and time-shifted and viewed, the viewing of the pay-per-view program reproduced based on the stored individual information and the information indicating the number of times of viewing is performed. And a viewing availability determination procedure for determining availability.

In the first aspect of the present invention, the receiving means comprises:
Receives program data, program information and individual information. The viewing permission determining means inquires of the broadcasting station whether or not the reproduced pay-per-view program can be viewed during the time-shift viewing of the pay-per-view program, and determines whether or not the viewing of the pay-per-view program is possible based on a response result of the inquiry. As a result, the broadcasting station can be charged at a desired timing even in time-shift viewing of a pay-per-view program.

[0015] In claim 4 of the present invention, the receiving means comprises:
Receives program data, program information and individual information. When recording a pay-per-view program, the transmission means transmits viewing information for charging to a broadcasting station. When a pay-per-view program is recorded, the storage means stores individual information and information indicating the number of times of viewing. When the recorded pay-per-view program is time-shifted and viewed, the viewability determination unit determines whether or not viewing is possible based on the stored individual information and information indicating the number of times of viewing. Accordingly, the broadcasting station can be charged at a timing according to the broadcast date and time regardless of the time shift viewing / listening timing.

According to claim 5 of the present invention, program data,
Program information and individual information are received. At the time of time-shift viewing of the pay-per-view program, the broadcast station is inquired about whether or not the reproduced pay-per-view program can be viewed, and based on the response result of the inquiry, whether or not the pay-per-view program can be viewed is determined.

According to claim 6 of the present invention, program data,
Program information and individual information are received. When recording a pay-per-view program, viewing information for charging is transmitted to a broadcasting station. When recording a pay-per-view program, individual information and information indicating the number of times of viewing are stored. When a recorded pay-per-view program is viewed in a time-shifted manner, whether or not viewing is possible is determined based on the stored individual information and information indicating the number of times of viewing.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a pay broadcast receiver according to one embodiment of the present invention.

The broadcast station 1 transmits a pay broadcast signal. A video signal and an audio signal constituting a program are, for example, M
A transport stream of the program encoded by the PEG standard is supplied to the scramble unit 4 as a TV (television) signal. The broadcast station 1 scrambles a paid broadcast program. The scramble unit 4 performs a scramble process using a predetermined scramble key on the input TV signal, and provides the multiplexed unit 7 with the scramble process.

In a pay broadcast, a viewer can receive and view a pay broadcast program by signing a viewing contract with a broadcast station. On the receiving side, for a program determined to be viewable according to the contract conditions and the like, the pay broadcast program is viewed by performing descrambling processing using a scramble key. Such determination of whether or not viewing is possible
It may be performed using a C card.

For example, in a device that receives a broadcast such as a sky perfect TV or a direct TV that uses a Japanese CS, an IC card is used to determine whether or not viewing is possible. The IC card stores a card ID for identifying the card and a master key Km unique to each card. The IC card is a microcomputer device, as will be described later, stores information such as contract conditions in a nonvolatile memory in the microcomputer, and determines whether or not viewing is possible at the time of receiving a program based on the program information and the information such as contract conditions. It is.

In order to determine whether or not viewing is possible, EC
M and EMM are used. The ECM is defined in ARIB STD-B25 version 1.0 (hereinafter referred to as the standard) of the BS digital broadcasting limited reception system standard developed by the Association of Radio Industries and Businesses. According to this provision,
The ECM is composed of a fixed unit that is always fixedly transmitted, and a variable unit that has different contents depending on the purpose. ECM
The fixed part has a protocol number, paying entity identification, work key identification, scramble key for scrambled program,
Judgment type, date and time, recording control and falsification control are arranged. In the ECM variable unit, function information related to tier (fixed amount) determination, function information related to pay-per-view (PPV) determination, and function information related to erasure are arranged. That is, the ECM transmits information specifying the program and information indicating whether or not recording is possible.

The EMM is also defined in the standard. According to this rule, the EMM is composed of a fixed unit that is always fixedly transmitted, and a variable unit whose contents differ depending on the purpose. Various function information, that is, function information on work keys, function information on tiers, function information on postpaid PPV, function information on energization control, function information on overall control, and function information on forced calling are arranged in the EMM variable section. You. In the EMM fixed part, information of a card ID, a related information byte length, a protocol number, a paying entity identification, an update number, and an expiration date indicating the end of the contract are arranged. Card I out of EMM
The portion excluding D is encrypted as described later.

The ECM generation / encryption unit 5 provides an ECM for each program.
Generate M. As described above, the ECM includes the scramble key, and the ECM generation / encryption unit 5 encrypts the generated ECM using the work key Kw, and then outputs the encrypted ECM to the multiplexing unit 7. Has become. On the receiving side, by using the work key Kw, the ECM can be decrypted to obtain a scramble key.

The broadcasting station 1 changes the work key Kw as appropriate in order to prevent the viewing contract from being changed and unauthorized viewing. For this reason, the broadcasting station 1 also multiplexes and transmits the work key Kw. As described above, information on the work key Kw is arranged in the EMM variable unit.

The EMM generation / encryption unit 6 generates an EMM. The EMM generation / encryption unit 6 transmits the EMM to an individual destination according to the viewing contract. That is, the EMM generation / encryption unit 6 arranges the non-encrypted card ID in the EMM fixing unit so that the receiving side can send the E-mail addressed to itself.
Allows MM to be identified. The card ID is given to the broadcasting station 1 at the time of the viewing contract.

That is, when a viewer makes a viewing contract with the broadcasting station 1, the viewer gives the broadcasting station 1 information on an IC card to be attached to the receiver. The broadcast station 1 stores a user and an ID in the viewer information storage unit 2.
It holds viewer information describing the relationship between the ID and the master key Km. The viewer management unit 3 updates the viewer information stored in the viewing information storage unit 2 according to the viewing contract, reads the ID and master key Km of each user, and outputs the read ID and EMM to the EMM generation / encryption unit 6. It has become.

The EMM generation / encryption section 6 generates an EMM fixed section and an EMM variable section including a work key Kw and a contract condition, and encrypts portions other than the card ID using the master key Km. EM from EMM generation / encryption unit 6
M is supplied to the multiplexing unit 7.

The multiplexer 7 outputs the output of the scrambler 5,
The output of the ECM generation / encryption unit 5 and the output of the EMM generation / encryption unit 6 are multiplexed and transmitted from the antenna 8. The broadcast signal from the antenna 8 is broadcast via a satellite (not shown).

In the present embodiment, the broadcasting station 1 determines conditions for time-shift viewing of a PPV program on the receiver side. The time-shift EMM generation unit 41 determines the conditions for time-shift viewing of the PPV program and outputs the same as the time-shift EMM.

The modem 42 is connected to a telephone line (not shown), fetches information transmitted from each user's receiver via the telephone line, supplies the information to the time shift EMM generation unit 41, and Shift EMM generation unit 4
The time shift EMM from 1 is transmitted to the user's receiver via the telephone line.

The broadcasting station 1 is a time shift EMM.
Thus, when time-shift viewing of a PPV program is permitted, the PPV program is charged based on a report of purchase from the receiver in response to the transmission of the time-shift EMM.

On the other hand, the pay broadcast receiver 10 receives a broadcast signal from a satellite through the antenna 11. The high-frequency signal from the antenna 11 is supplied to a channel selection circuit 12, which selects a program on a channel specified by the system controller 29 and outputs program data. The output of the tuning circuit 12 is supplied to the switching circuit 13 and also to the storage device 35 via the terminal 32.

The system controller 29 switches a channel to be selected based on a user operation. The user controls the pay broadcast receiver 10 by using, for example, the remote controller 31. The remote controller 31 transmits a signal based on a user operation,
The remote control receiver 30 receives a signal from the remote controller 31 and provides the signal to the system controller 29. This allows
The system controller 29 controls each unit of the pay broadcast receiver 10 based on a user operation.

The recording device 35 is supplied with the program data from the tuning circuit 12 via the terminal 32, and records the program data input in response to a user operation on a predetermined recording medium.
Further, the recording device 35 reproduces the program data recorded on the recording medium, and
0 can be output.

Further, the recording device 35 is connected to the pay broadcast receiver 10 via the terminal 34, and is connected to the EMM encryption / decryption unit 28 in the IC card 19 inserted in the pay broadcast receiver 10. Is recorded on a recording medium in correspondence with the program data from the channel selection circuit 12, and the recorded EMM signal is reproduced to reproduce the EMM signal.
8 can be output.

Various devices can be used as the recording device 35. For example, various devices such as a device using a DVD and a hard disk, a digital VTR, and the like can be considered. Further, the connection between the receiver 10 and the recording device 35 is not specified.

Although the terminals 32 and 33 for inputting and outputting the scrambled program and the terminal 34 for inputting and outputting the EMM are separate, a case where the EMM is input and output in a multiplexed manner with the program may be considered.

When viewing a broadcast program, the switching circuit 13 selects the output of the channel selection circuit 12 and selects the output of the separation circuit 14.
To view the recorded program, the terminal 3
The output of the recording device 35 from the third device 3 is selected and supplied to the separation circuit 14. The separation circuit 14 separates the program stream, the ECM, and the EMM included in the input program data, and outputs them to the descrambler 15, the IC card 19, and the filtering unit 17, respectively.

As will be described later, the descrambler 15
The descramble key is given from the IC card 19, and the inputted stream is descrambled to perform MPEG decoding.
Output to the decoder 16. The MPEG decoder 16 decodes the input transport stream and outputs a video signal and an audio signal (TV signal) of the program to a monitor (not shown).

The IC card 19 stores a card ID in a storage unit (not shown). The ID reading unit 18 reads a card ID from the IC card 19 and supplies the card ID to the filtering unit 17. Filtering unit 1
7 identifies the EMM addressed to itself by comparing the card ID included in the EMM provided from the separation circuit 14 with the card ID from the ID reading unit 18. The filtering unit 17 sends the EMM addressed to the own device to the IC card 19
Output.

The ECM from the separation circuit 14 is provided to the ECM decoding unit 21 of the IC card 19, and the EMM from the filtering unit 17 is provided to the EMM decoding unit 22. The IC card 19 has a Kmi memory 23 storing a master key Km. The EMM decryption unit 22 uses the master key Km from the Kmi memory 23 to
Is decrypted. Thus, the work key Kw and other information included in the EMM are obtained. EMM decoding unit 22
Outputs the decrypted EMM (including the work key Kw) to the EMM memory 24 and outputs the work key Kw to the ECM decryption unit 21.

The ECM decoding unit 21 is provided with the EMM decoding unit 2
The ECM from the separation circuit 14 is decrypted by using the work key Kw from the EMM encryption / decryption unit 28 described later. Thereby, the scramble key and other information included in the ECM can be obtained. The decoded output of the ECM decoding unit 21 is provided to the viewability determination unit 26.

The EMM memory 24 holds the input EMM, and supplies the held EMM to the EMM decoding unit 22 until the EMM is updated by the broadcasting station 1.
The result is provided to the viewing permission / inhibition determination unit 26 via the selector 25. Further, the EMM memory 24 outputs the held EMM to the EMM encryption / decryption unit 28. E
The MM encryption / decryption unit 28 receives E from the EMM memory 24
The MM is encrypted and supplied to the storage device 35 from the terminal 34. EMM encryption / decryption unit 2
8, the EMM reproduced from the storage device 35 is inputted via the terminal 34, the inputted EMM is decrypted, the decrypted output is outputted to the selector 25, and the work key Kw included in the decrypted output is decrypted by ECM. Output to the unit 21.

The selector 25 has a modem 4 to be described later.
3, a time shift EMM is also provided. Selector 2
5 selects an EMM from the EMM memory 24 during real-time viewing, selects an EMM from the EMM encryption / decryption unit 28 during time-shift viewing of programs other than PPV programs, and selects a modem during time-shift viewing of PPV programs. The time-shift EMM is selected from 43 and output to the viewability determining unit 26.

The viewing permission / inhibition unit 26 determines whether the input ECM
And EMM are compared to determine whether the program data input to the descrambler is permitted to be viewed. When it is determined that the viewing is possible, the viewing availability determination unit 26 sets
The scramble key from the CM decryption unit 21 is given to the descrambler 15 as a descramble key. When it is determined that the viewing is not possible, the viewing permission determining unit 26 does not output the scramble key. Therefore, in this case, the descrambler 15 cannot perform the descrambling process, and cannot normally view the program.

The viewing permission / inhibition judging section 26 outputs the viewing information to the viewing information memory 27 when the viewer decides to purchase when it is judged that the viewing is possible.
In PPV (pay-per-view), purchase or non-purchase can be determined for each program. The viewing information memory 27 stores information for specifying a purchased (viewed) PPV program as viewing information. The viewing information stored in the viewing information memory 27 is supplied to the modem 43. The modem 43 can exchange information with a broadcasting station via a telephone line (not shown). The viewing information from the modem 43 is transmitted to the broadcasting station 1 and used for adjusting the viewing fee.

In the present embodiment, the viewing permission / inhibition judging unit 26 determines the PP based on the decoded output of the ECM decoding unit 21.
When it is detected that determination is made as to whether or not time-shift viewing of the V program is to be viewed, an inquiry about time-shift viewing of the PPV program is made to the broadcast station 1. That is, the viewing permission / inhibition determining unit 26 determines whether the modem 4
3 to transmit to the broadcasting station 1 information for specifying the PPV program, information such as date and time, and information for specifying the user (IC card, telephone number, etc.). The information for specifying the PPV program includes, for example, the EC of the program.
Use M.

The modem 43 responds to the inquiry about the time shift viewing of the PPV program by using the time shift E
When the MM is supplied from the broadcast station 1, the received time-shifting EMM is received via the selector 25 by the viewability determining unit 26.
Output.

The viewing permission / inhibition judging section 26 controls the ECM decoding from the ECM decoding section 21 during the time-shift viewing of the PPV program.
The determination as to whether or not viewing is possible is made using the EMM for time shift transmitted from the broadcast station 1.

Next, the operation of the embodiment configured as described above will be described.

The broadcast station 1 scrambles the program stream by the scrambler 4. The ECM generation / encryption unit 5 generates an ECM including a scramble key and encrypts the ECM using the work key Kw. Viewer information storage unit 2
Stores viewer information including information on each user, card ID and master key Km. The EMM generation / encryption unit 6 transmits the work key Kw and the card I at a predetermined timing.
An EMM including D is created, and the portion excluding the card ID is encrypted using the master key Km.

The scrambled program stream and the encrypted ECM and EMM are multiplexed in the multiplexing unit 7 and transmitted from the antenna 8.

On the receiving side, a broadcast signal received via the antenna 11 is tuned to a program of a predetermined channel by the tuning circuit 12. Now, it is assumed that real-time viewing is performed. In this case, the switching circuit 13
Selects the output of the tuning circuit 12 and outputs it to the separation circuit 14. The separation circuit 14 supplies the program data, ECM, and EMM included in the output of the switching circuit 13 to the descrambler 15, the ECM decoding unit 21, and the filtering unit 17, respectively.

The ID reading section 18 reads a card ID from the IC card 19 and supplies the card ID to the filtering section 17. The filtering unit 17 compares the card IDs, filters the EMM addressed to itself from the output of the separation circuit 14, and outputs the filtered EMM to the IC card 19.

The EMM decoding unit 22 of the IC card 19
The master key Km is read from the Kmi memory 23,
The EMM input to the card 19 is decrypted and output to the EMM memory 24. Further, the EMM decryption unit 22 gives the work key Kw included in the EMM to the ECM decryption unit 21.
Using the work key Kw, the ECM decryption unit 21 decrypts the ECM from the separation circuit 14. With this, EC
The M decoding unit 21 obtains the ECM including the scramble key and outputs the obtained ECM to the viewing availability determination unit 26.

If the broadcast signal from the broadcast station 1 does not include the EMM addressed to the own device, the EMM decoding unit 22 outputs
Work key K in EMM stored in MM memory 24
w to the ECM decoding unit 21.

The selector 25 receives E from the EMM memory 24.
The MM is output to the viewing availability determination unit 26. The viewing permission / inhibition judging unit 26 determines the descrambler 1 based on the ECM and the EMM.
It is determined whether the program data input to 5 is for a viewable program. Assuming that the channel (program) that the user desires to view with the remote controller 31 is the one permitted to be viewed by the viewing contract, the viewability determination unit 26 determines whether the program data input to the scrambler 15 is to be viewed. It is determined that the program belongs to
Is output to the descrambler 15 as a descramble key.

The descrambler 15 descrambles the program data using the descramble key. The program stream from the descrambler 15 is supplied to the MPEG decoder 16 and decoded to obtain a TV signal.
By supplying this TV signal to the monitor, it is possible to view a program specified by the user.

If the program designated by the user is not subscribed, the viewability judging section 26 sets the ECM,
The EMM determines that viewing is impossible, and does not output a scramble key. Therefore, in this case, the program specified by the user is not descrambled, and the program cannot be viewed normally.

When the program for which the viewing permission is determined is PPV, the viewing permission determining section 26 stores the viewing information in the viewing information memory 27. The viewing information stored in the viewing information memory 27 is transmitted to the modem 43 at a predetermined timing.
Is transmitted to the broadcasting station 1.

Next, it is assumed that the user instructs recording of a program. In this case, the program data from the tuning circuit 12 is supplied to the recording device 35 via the terminal 32 and is recorded on the recording medium.

The switching circuit 13 supplies the output of the tuning circuit 12 to the separation circuit 14. Thus, the EMM is supplied from the filtering unit 17 to the IC card 19 even when recording a program. The EMM decoding unit 23 calculates the Kmi
EMM using master key Km read from memory 23
And outputs the demodulated output to the EMM memory 24. E
The MM memory 24 updates the recorded EMM according to the output of the EMM decoding unit 22. When the EMM addressed to the own device is not broadcast, the EMM memory 24 does not update the EMM held therein.

When recording a program, the EMM memory 24 outputs the held EMM to the EMM encryption / decryption unit 28. The EMM encryption / decryption unit 28 receives the input EM
M is encrypted and output from the IC card 19. The encrypted EMM is supplied from a terminal 34 to a recording device 35, and the recording device 35 records the encrypted EMM together with the corresponding program data on a recording medium.

Next, it is assumed that the user reproduces and watches the program recorded in the recording device 35. In this case, the system controller 29 causes the switching circuit 13 to select the output of the recording device 35 and the selector 25
To select the output of the EMM encryption / decryption unit 28. The program data from the recording device 35 is supplied to the separation circuit 14 via the switching circuit 13. The EMM corresponding to the program data reproduced from the recording device 35 is supplied from the terminal 34 to the EMM encryption / decryption unit 28 in the IC card 19. The EMM encryption / decryption unit 28 outputs the reproduced E
Decode and output the MM.

The separation circuit 14 outputs the program data being reproduced and output to the descrambler 15 and outputs the ECM to the ECM decoding unit 21. The ECM decryption unit 21 receives the work key Kw included in the EMM from the EMM encryption / decryption unit 28.
Is used to decode the ECM. The ECM decoding unit 21 outputs the decoded ECM to the viewing permission / prohibition determining unit 26. The selector 25 outputs the EMM from the EMM encryption / decryption unit 28 to the viewability determination unit 26.

As described above, the ECM corresponding to the program at the time of the broadcast of the program and the EMM corresponding to the program are input to the viewability determining unit 26. The viewability determining unit 26 determines the viewability from the input ECM and EMM. For a program other than a PPV program, if a viewing contract is made for a program recorded at the time of the broadcast of the program, the viewability determination unit 26 can determine that the program is viewable from the input ECM and EMM. Conversely, if the viewing contract for the recorded program has not been concluded, the viewability determination unit 26
Can be determined to be unviewable from the input ECM and EMM. In this manner, for programs other than the PPV program, even when the program recorded in the recording device 35 is time-shifted and viewed, viewing is performed according to the viewing contract.

When the viewing contract is changed in the middle, for example, when a program recorded at the end of a certain month is viewed on the next day (next month), the contract is changed at the change of the month.
Even if there is no longer a contract for a channel for broadcasting a recorded program from the following month, the recorded program and the EMM corresponding to this program can be used to determine whether or not viewing is possible, so that time-shifted viewing can be performed normally. is there.

Next, it is assumed that the PPV program is time-shifted and viewed. The PPV program from the recording device 35 is supplied to the separation circuit 14 via the switching circuit 13. The separation circuit 14 outputs the ECM of the reproduced PPV program to the ECM decoding unit 21.

On the other hand, the EMM corresponding to the PPV program is reproduced from the recording device 35 and the EMM encryption / decryption unit 28
And supplied to the ECM decoding unit 21. The ECM decoding unit 21 decodes the ECM using the decoded EMM, and outputs the ECM to the viewability determination unit 26.

The viewing permission / inhibition judging section 26 receives the input ECM
Thus, it is detected that the viewing permission / inhibition determination is performed for the time-shift viewing of the PPV program. As for the PPV program, the receiver 10 displays on the display screen of a monitor (not shown) for allowing the viewer to determine whether or not to purchase the reproduced PPV program, as in the case of real-time viewing.

If the viewer performs an operation not responding to the display to the effect that the purchase is not made, the viewability determining section 26 determines that the view is not possible. In this case, no descrambling process is performed.

On the other hand, if the viewer has indicated the intention to purchase, the viewability determining section 26 controls the modem 43 to
An inquiry about time-shift viewing of a PV program is transmitted to the broadcast station 1.

This inquiry is transmitted to the broadcasting station 1 via the telephone line, and the time shift E
It is taken into the MM generation unit 41. The time-shifting EMM generating unit 41 generates a time-shifting EMM that includes information on whether or not the inquired PPV program can be viewed according to the specified PPV program, broadcast date and time, contract conditions, and the like. The EMM for time shift is transmitted via the modem 42 to the user who transmitted the inquiry.

The modem 43 receives the received time shift EM.
M is output to the viewing permission / inhibition determination unit 26 via the selector 25. The viewing permission / inhibition judging section 26 receives the time shift E
Using the MM and the ECM of the reproduced PPV program, whether or not viewing is possible is determined. If the viewing is possible, the viewing availability determination unit 2
6 supplies the descramble key to the descrambler 15 and reports the purchase to the broadcasting station 1 via the modem 43.

Thus, the broadcast station 1 charges for the PPV program. In this way, it is possible to collect a fee for the PPV program at the timing intended by the broadcasting station 1. That is, when the center approves the purchase application for the PPV program and reports the purchase on the receiver side, the charging is completed. It is not necessary to accumulate and collect viewing information for this PPV program.

When a time shift EMM indicating that viewing is disabled is transmitted from the broadcasting station, the viewing availability determining unit 2
No. 6 determines that viewing is impossible, and does not perform the descrambling process.

It is apparent that the viewing information memory 27 may be updated when time-shifted viewing of the PPV program is performed, and charging may be performed when the updated viewing information is transmitted to the broadcasting station 1. is there.

Furthermore, in the above embodiment, the broadcast station is inquired after asking the viewer whether the purchase is possible. However, after waiting for the answer from the broadcast station, the viewer is asked whether the purchase of the PPV program is possible. It is also clear that the user may be asked to make an inquiry.

As described above, in the present embodiment, P
When viewing a PV program in a time-shifted manner, an inquiry is made to the broadcast station to determine whether or not the program can be viewed according to the intention of the broadcast station 1, and the broadcast station 1 suffers a disadvantage in charging. That can be avoided.

In the above embodiment, billing is performed after a purchase report is received from the receiver. However, various timings can be considered for billing. For example, billing may be performed when an application for purchasing a PPV program is permitted at the center. Also in this case, there is no need to accumulate and collect the viewing information of the program.

In the above embodiment, an example in which the EMM is recorded by the recording device 35 has been described.
The present invention can be applied to a case where the EMM is not recorded. Even in this case, the PPV program is recorded on the recording device in a state of being scrambled. Then, the PPV program can be determined at the time of reproduction based on some information multiplexed on the program without descrambling the reproduced program and without decoding the ECM of the reproduced program. If there is no such information, it is necessary to record the fact that the program is a PPV program at the time of recording by the recording device at the same time as the program, and to make it possible to determine the PPV program at the time of reproduction.

FIG. 2 is a block diagram showing another embodiment of the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the embodiment shown in FIG. 1, billing is performed during time-shift viewing. On the other hand, in the present embodiment,
Billing is performed when a PPV program is recorded.

Usually, a PPV program is charged according to the number of times of viewing. In order to charge at the time of recording a PPV program, it is necessary to limit the number of viewings according to the fee. By creating such information on the time-shift viewing of the PPV program on the broadcast station side, the intention of the broadcast station side can be reflected.

In FIG. 2, the broadcasting station 51 deletes the time-shift EMM generating section 41 and replaces the ECM generating / encrypting section 5.
1 is that an ECM generation / encryption unit 45 is employed in place of FIG.
Is different from broadcast station 1.

The ECM generation / encryption section 45 arranges, in the ECM, information on the number of times of viewing by time shift and whether or not to permit real-time viewing simultaneously with time shift viewing.

The pay-broadcast receiver 54 employs an IC card 52. The IC card 52 employs a time-shift EMM storage unit 46 instead of the EMM encryption / decryption unit 28, and the viewing availability determination unit 26. Is different from the IC card 19 in that a viewing permission / inhibition judging unit 53 is adopted instead of the IC card 19.

The time shift EMM storage unit 46 stores
For the V program, E given from the EMM memory 24
In addition to storing the MM, the information on the number of times of viewing given from the viewability determining unit 53 is stored.

The viewability determining unit 53 determines whether or not viewing is possible by using the ECM from the ECM decoding unit 21 and the EMM from the EMM memory 24 except during the time shift viewing of the PPV program. The viewability judging section 53 records the recording of the program by the system controller 29 on the recording device 35.
In the case where it is indicated that the program is to be viewed by the ECM from the ECM decoding unit 21,
It detects whether the program is a V program or not.

[0091] The viewing permission / inhibition judging section 53 determines whether the P
When detecting that the program is a PV program, an inquiry about whether to purchase the PPV program is displayed on a monitor (not shown). That is, in the present embodiment, even in the case of time-shift viewing, the viewer must determine the purchase of the PPV program at the time of recording.

When the viewer decides to purchase a PPV program,
In order to enable time-shift viewing, the viewability determining unit 53 stores the EMM from the EMM memory 24 in the EMM storage unit 4.
6 and the information on the number of times of viewing included in the ECM is also stored in the EMM storage unit 46. Further, the viewability determining section 53 updates the view information in the view information memory 27 in accordance with the purchase of the PPV program.

The viewing permission / inhibition judging section 5 communicates with the system controller 29 to store information indicating the correspondence between the program recorded by the recording device 35 and the EMM stored in the time shift EMM storage section 46. It is made to hold. For example, the system controller 29 may use the recording device 35 to record information indicating correspondence for each program on a recording medium.

[0094] The viewing permission / inhibition judging section 53 acquires information on whether or not to permit real-time viewing at the same time as time-shift viewing from the EMC, and also determines whether or not viewing is possible during real-time viewing.

Further, the viewing availability determination section 53 decrements the information on the number of times of viewing stored in the time-shifting EMM storage section 46 for each viewing when viewing the PPV program in time shift.

A plurality of recording areas for the time-shift EMM and a recording area for the count value of the number of times of viewing can be provided.

Next, the operation of the embodiment configured as described above will be described.

At the time of video recording, the scrambled program data is supplied from the tuning circuit 12 to the recording device 32.
Further, the EMM decoding unit 22 decodes the EMM, and the ECM decoding unit 21 decodes the ECM. When the viewing permission / inhibition determining unit 53 detects that the program is a PPV program by the decrypted ECM, the viewing permission / inhibition determination unit 53 performs a display for inquiring the viewer whether the purchase is possible.

When an operation based on a purchase intention is performed, the viewability determining section 53 stores the EMM from the EMM memory 24 in the EMM storage section for time shift 46, and counts the number of times of viewing of the time shift view obtained from the ECM. The information is stored in the EMM storage unit for time shift 46, and the viewing information in the viewing information memory 27 is updated. The viewing information is transmitted by the modem 43 to the broadcasting station 51 at a predetermined timing.

Thus, prior to time-shift viewing, charging is performed. If the viewer performs an operation not to purchase, the viewability determining unit 53 does not output the descrambling key, and the descrambling process is not performed.

Next, it is assumed that the PPV program is reproduced from the recording device 35 for time shift viewing. The system controller 29 controls the switching circuit 13 to select the output of the recording device 35. Further, the selector 25
The EM stored in the time shift EMM storage unit 46
M is output to the viewability determination section 53.

The EMM storage unit for time shift 46
Is controlled by the viewing permission / inhibition determining unit 53 to search for an EMM for descrambling the reproduced PPV program from the EMM storage unit for time shift 46. If the corresponding EMM and the count of the number of times of viewing do not exist in the storage area, the viewability determining unit 53 determines that viewing is not possible.

As a result of the search, if a corresponding EMM is found, viewing permission / inhibition judging section 53 checks the number of viewing times. If the count value is 0, the P
It is determined that the PV program cannot be viewed, and the EMM storage area for the time shift and the storage area of the number-of-viewings count value of the PPV program are cleared. If the count value is not 0, the count value is decremented by 1 and the EMM is read from the storage area of the time shift EMM storage unit 46. The viewability determining section 53 supplies the read EMM to the ECM decoding section 21.

[0104] The ECM decoding unit 21 outputs the time shift E
PPV reproduced using the EMM from the MM storage unit 46
Decode the ECM of the program. The viewability determining unit 53 determines the viewability based on the decoded ECM and the read EMM. When it is determined that the viewing is possible, the viewing permission determining unit 53 outputs the descrambling key. As a result, the reproduced PPV program is descrambled and can be viewed.

When the viewing permission / inhibition judging section 53 judges that the viewing is not possible based on the EMM read from the EMM storage section for time shift 46, a display indicating that the viewing is not possible is performed. When the count value indicating the number of times of viewing has become 0, the viewability determination section 53 clears the storage area of the time-shift EMM for the PPV program and the storage area of the number-of-viewings count value.

As described above, in the present embodiment, P
By performing charging at the time of recording a PV program, a broadcasting station can collect a fee at an intended timing. on the other hand,
For a user, the number of times is limited by paying a fee in advance, but the user can view the PPV program without any restrictions on the time limit.

In addition, management of the number of times of viewing is controlled by the IC card 52.
Since the program is performed within the program, it is possible to prevent the program purchased once from being viewed unlimitedly. For example,
Even a program that cannot be recorded in a conventional PPV program can be a program that can be viewed only once in real-time or time-shifted viewing by setting the count value to 1 and real-time viewing disabled.

[0108]

As described above, according to the present invention, it is possible to limit the sales period of a pay-per-view program, thereby enabling time-shift viewing of a pay-per-view program without incurring a disadvantage to a broadcasting station. It has the effect of being able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a pay broadcast receiver according to one embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Broadcasting station, 6 ... EMM generation / encryption part, 10 ... Pay broadcasting receiver, 15 ... Descrambler, 19 ... IC card,
21: ECM decoding unit, 22: EMM decoding unit, 26 ...
Viewing permission / prohibition judging section, 28 EMM encryption / decryption section, 35
... Recording device, 41 ... Time shift EMM generation unit, 4
2,43 ... Modem.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 7/081 H04N 7/08 Z 7/16 F term (reference) 5C025 AA30 BA14 CB05 CB08 DA05 5C053 FA29 GB06 GB21 HA21 JA21 KA21 KA24 LA06 LA14 5C063 AA01 AB03 AC01 CA29 CA36 DA01 DA07 DA13 5C064 BA01 BB01 BC06 BC07 BC17 BC22 BC25 BD02 BD04 BD08 BD09 BD14 CA14 CB01 CB08 CC04

Claims (6)

[Claims] 1. Program data, program information having a scramble key used for scrambling the program data and information for specifying the program, a work key used for encrypting the program information, and a viewing contract Receiving means for receiving individual information having information corresponding to the contents; and reproducing the program data of the pay-per-view program from the recording means in which the program data received by the receiving means is recorded and reproducing the time-shifted program. A pay-per-view receiver comprising: a broadcast station that inquires of a broadcasting station whether or not the pay-per-view program has been viewed, and determines whether or not the reproduced pay-per-view program can be viewed based on a response result of the inquiry. 2. The information processing apparatus according to claim 1, wherein the viewing permission / inhibition determining means obtains the individual information received by the receiving means, and the program information using a work key in the individual information obtained by the individual information obtaining means. Program information acquiring means for decrypting the information, encrypting means for encrypting and outputting the individual information acquired by the individual information acquiring means, and recording the program data received by the receiving means and the encrypted output from the encrypting means. Decoding means for decoding the encrypted output to obtain the individual information when reproducing the program data of the pay-per-view program from the recorded recording means for time-shift viewing; and outputting and decoding the program information obtaining means. Means for detecting whether or not viewing is possible with respect to time-shift viewing of pay-per-view programs using the output of the means. Pay broadcast receiver according to claim 1, symptoms. 3. The pay broadcast receiving apparatus according to claim 1, wherein the response result of the inquiry is time shift individual information. 4. Program information, program information having a scramble key used for scrambling the program data and information for specifying a program, a work key used for encrypting the program information, and a viewing contract Receiving means for receiving individual information having information corresponding to the content; transmitting means for transmitting viewing information for billing to a broadcasting station along with recording of the pay-per-view program; and transmitting the individual information at the time of recording the pay-per-view program Storage means for storing together with information indicating the number of times of viewing, and when the program data of the pay-per-view program is reproduced from the recording means in which the program data received by the receiving means is recorded for time-shift viewing, the data is stored in the storage means. Viewing permission / prohibition for determining whether or not the reproduced pay-per-view program can be viewed based on the individual information and the information indicating the number of times of viewing. A pay broadcast receiver, comprising: a determination unit. 5. Program data, program information having a scramble key used for scrambling the program data and information for specifying the program, a work key used for encrypting the program information, and a viewing contract A procedure for receiving the individual information having information corresponding to the content, and a method for viewing the reproduced pay-per-view program when the program data of the pay-per-view program is reproduced from the recording means for recording the received program data for time-shift viewing. Inquires the broadcasting station about the availability, and based on the response result of the inquiry,
A pay-per-view viewing method for determining whether or not the reproduced pay-per-view program can be viewed. 6. A program data, program information having a scramble key used for scrambling the program data and information for specifying a program, a work key used for encrypting the program information, and a viewing contract. A step of receiving individual information having information corresponding to the content; a step of transmitting viewing information for charging to a broadcasting station along with the recording of the pay-per-view program; and viewing the individual information at the time of recording the pay-per-view program. A procedure for storing together with the information indicating the number of times, and when the program data of the pay-per-view program is reproduced from the recording means for recording the received program data for time-shift viewing, the stored individual information and the information indicating the number of times of viewing are stored. And a viewing permission / prohibition determining step of determining whether the viewing of the pay-per-view program reproduced on the basis of the viewing is possible. How to watch time shift broadcasting