JP3179624B2 - Broadcast receiving system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiving system for receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed. The present invention relates to a multi-channel pay broadcast receiving system suitable for use in a mobile receiving station.

[0002]

2. Description of the Related Art As shown in Japanese Patent Publication No. 4-6634, a conventional multi-channel pay broadcasting system for music, video programs and the like is provided with a fixed descrambler (decryption machine) and has a pay broadcasting contract in advance. Decoding code is supplied to the decryption machine periodically by broadcasting, telephone line, etc.
It was a pay-broadcast system with a contract for each fixed station that allowed viewing for a certain viewing period.

[0003]

However, in the case of a mobile pay broadcast, the broadcast receiver is not fixed, and since it moves in a wide area, the pay broadcast station differs depending on the area, and contracts are made with a plurality of broadcast stations. Otherwise, there is an inconvenience that the code cannot be viewed without the decoding code.

Further, when moving, when receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed, an encrypted broadcast wave is also received when a normal broadcast signal is selected. The inconvenience that an unpleasant sound is output or a strange image is displayed appears.

[0005] Further, even if a user pays an amount corresponding to a certain viewing time in advance and is allowed to view a plurality of pay broadcasts, it is unknown which pay broadcast is being watched. There is a problem that it is not possible to distribute the usage fee.

In the prepaid (prepaid) viewing method, there is also a problem that the output of the pay broadcast program being viewed is suddenly stopped when the viewing time corresponding to the prepaid amount expires.

[0007] The present invention has been made in view of the above points,
The aim is to make it possible to receive paid broadcasts by region at mobile receiving stations that move over a wide area with a simple system and to distribute fair usage fees to paying broadcasters. To provide a receiving system.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a broadcast receiving system for receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed. A decryption device provided inside the receiver for performing decryption, and a cryptographic information supply device (for example, an IC card or the like) for supplying persistent decryption information from the outside to the receiver for performing decryption. The decryption device is configured to operate by continuously supplying decryption information from an external encryption information supply device.

Further, a cryptographic information supply device for supplying a continuous decryption information to the receiver from the outside is provided with data indicating a time when the pay broadcast signal corresponding to the paid (prepaid) amount can be received. (Viewable time data) is stored, and when the pay information signal is viewed by connecting the encryption information supply device to the receiver, at least the pay broadcast station code and the actual viewing time data received from the receiver side are encrypted. When the total of the actual viewing time exceeds the viewable time according to the paid amount, the supply of the encryption information from the encryption information supply device is prohibited. .

[0010] Further, the encryption information supply device can be reused by the user re-paying an amount corresponding to the scheduled viewing time by a separately provided writing device. At the time of rewriting, the writer reads the received / viewed pay broadcast station code and the corresponding viewing time as the use result stored in the cryptographic information supply device, and reads the corresponding viewing time in units of a certain period. The received pay station code and the viewing time are stored in a storage device, and the paid amount can be calculated among pay broadcasters according to the received pay station code and the viewing time during the period. To

[0011] In addition to the above, in the case of watching a pay broadcast in which the viewable time corresponding to the paid amount expires, for example, only the program can be viewed after the viewable time expires. In the case of rewriting (payment of recharge), the excess charge can be settled.

[0012]

Since a cryptographic information supply device composed of an IC card or the like can easily incorporate a relatively large-capacity semiconductor memory, it can store decryption information for a pay broadcast in each region and can be added to a pay station. It is possible to supply a decryption code corresponding to a code or the like, and it is possible to receive pay broadcasting in any region.

[0013] Further, since the receiver side writes the pay broadcast viewing results such as the pay broadcasting station code and the actual viewing time into the cryptographic information supply device such as an IC card, etc., it is necessary to reuse the cryptographic information supply device. At the time of paying the usage fee, the viewing result of each user can be read out, and by allocating the payment fee to the pay broadcaster based on this information for a certain period, the usage fee can be distributed substantially according to the usage result. .

[0014] Even if the user is watching a pay broadcast in which the viewable time corresponding to the paid amount expires, a postpay settlement method can be selected at the time of rewriting (payment of the recharge) by the writer. It is possible to avoid sudden interruption of viewing of a broadcast.

It is easy to detect a state in which the encryption information supplier is not connected to the receiver, and when this disconnection is detected, the presence / absence of encryption added to the broadcast wave is added to the information. If you can select only unencrypted regular broadcasts based on the above, when you select a channel while the encryption information supply device is not connected, you will receive encrypted broadcast waves and output unpleasant sounds. However, the inconvenience of displaying strange images can be avoided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a receiver according to the present embodiment for receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed. In the figure, reference numeral 1 denotes a decoder for extracting a viewing program signal from a digital broadcast signal received and digitized by the tuner unit TU in the preceding stage, and 2 denotes program information, a broadcast station code, and pay broadcast from the digital broadcast signal. The decoder 3 for extracting the encrypted code and additional information such as the presence / absence of the encrypted code and the like, and modifies the scrambled viewing program signal into a digital signal from which an output signal can be extracted by the signal processing circuit 4 at the subsequent stage. 4 is a signal processing circuit for converting the modified viewing program signal into an analog signal, 5 is an analog signal output circuit, and 6 is a display and operation key input unit for notifying program information and remaining viewing time. A display control operation unit for transmitting a content of operation of the operation key input unit to the tuner unit TU to control broadcast reception;
8 is a timer for counting the reception time of a pay broadcast or a free broadcast (normal broadcast), 9 is a receiver and a cryptographic information supplier 1
An interface with 1 is a receiver ID code for enabling use of a dedicated pay broadcast, and 11 is an encryption information supply device such as an IC card or a magnetic card.

FIG. 2 is a block diagram showing the cryptographic information supply device 11 such as an IC card or a magnetic card, and a card writing terminal 30 to which the cryptographic information supply device 11 is connected as necessary. In this example, the cryptographic information supply device 11 includes a card interface unit 12, a card control unit 13, and a card storage device 14, but the card (the cryptographic information supply device 11) stores the card. In the case where only the device 14 is used, the interface unit 12 and the functional units of the card control unit 13 are arranged in the card writing terminal 30 and the receiver in FIG. In the card writing terminal 30, reference numeral 15 denotes an interface unit of the card writing terminal;
Is a storage device of the card writing terminal, 17 is a control unit of the card writing terminal, 18 is a charge storage unit of the card writing terminal, 19 is a display unit of the card writing terminal, and 20 is a centralized control of counting of data of the card writing terminal. It is a communication modem.

FIG. 3 shows an example of a data format of a scrambled digital broadcast. In FIG. 3, reference numeral 21 denotes a synchronization signal portion, 22 denotes a data control signal portion, and 23 denotes a data control signal portion.
Is scrambled data. The data format of this scrambled digital broadcast is, for example, FIG.
As shown in (1), a data control signal section 22 for transmitting data such as a broadcast station code, program information, encryption for decrypting a scrambled pay broadcast, data indicating the presence or absence of encryption, etc., following the synchronization signal section 21. , Followed by scrambled data, which is a digital viewing program signal scrambled when paid. Then, the synchronizing signal 21 in which these signals 22 and 23 are inserted at a constant interval.
Sent after.

Next, the operation of this embodiment will be described. In FIG. 1, the broadcast station selected by the operation key input of the display control operation unit 6 is received by the tuner unit TU in the preceding stage of the decoders 1 and 2, and the detected digital signal is extracted by the decoder 1 as a viewing program signal. . This viewing program signal is scrambled in the case of pay broadcasting, and is not scrambled in the case of free broadcasting (normal broadcasting). In the case of a free broadcast without scrambling, the viewing program signal passes through the decryption device 3 as it is, is converted into an analog signal by the signal processing circuit 4, and is output from the output circuit 5.

Here, in this embodiment, the receiver is:
The receiver automatically detects and identifies whether or not the encryption information supply device 11 is connected. Further, if the broadcast wave information is added to the broadcast wave, the receiver can easily identify whether the broadcast wave is an encrypted (scrambled) pay broadcast or not. Therefore, in this embodiment, when it is detected that the encryption information supply device 11 is disconnected, the receiver is not scrambled based on the encryption presence / absence information added to the broadcast wave. A mode in which only a (non-encrypted) normal broadcast can be selected is automatically selected, or this mode is set by a user operation. Therefore, in the reception operation mode, when a channel is selected when the encryption information supply device 11 is not connected, a scrambled (encrypted) broadcast wave is received, and unpleasant sound is output or strange video is output. Can be avoided.

In addition, in the case of a scrambled pay broadcast, if a collective individual contract such as a monthly unit for each broadcasting station has been completed, or if there is continuous cryptographic information from the cryptographic information supply device 11, After confirming that the receiver is a dedicated receiver by the receiver ID code 10 in the receiver and decrypting the scrambled viewing program signal output from the decoder 1 by the decryptor 3, the signal processing circuit 4 Convert to analog signal and output
Output from

Here, the encryption information supply device 11 mainly
The receiver is mounted on a car or the like and is provided for traveling over a wide range of different pay broadcast areas, and is capable of receiving scrambled pay broadcasts of a large number of pay broadcast stations within a wide range (decoding). (Possible), the decryption information for almost all assumed pay broadcasts within a wide range is stored. Also, in the case where a collective individual contract for each broadcasting station or the like is made on a monthly basis, although not shown, a cryptographic information supplier different from the cryptographic information supplier 11 (a second cryptographic information supplier) Is prepared and connected to the receiver. The second cryptographic information supply device is mainly provided for receiving a contracted pay broadcast that covers only a predetermined area (for example, an area where a user lives), and receives the contracted pay broadcast. When selected, the decryption information is supplied from the second cryptographic information supply device to the decryption device 3. Further, the second cryptographic information supply device for the collective individual contract usually has a box-type structure.
The update information (the validity period update information and, in some cases, the updated decryption information) is periodically written to the encryption information supply device by broadcasting or telephone line and updated to a usable state. Note that the second cryptographic information supply device can be configured by an IC card or the like in the same manner as the cryptographic information supply device 11. If the second cryptographic information supply device is configured by an IC card or the like, a card described later will be used. The updating process may be performed by the writing terminal 30.

On the other hand, in the case of a scrambled pay broadcast, if the collective individual contract as described above has not been made, or if there is no continuous encrypted information from the encrypted information supply device 11, the timer 8 The broadcast can be received only for a short period of time so that the broadcast content can be determined, so that the user can be interested in the pay broadcast, encourage the connection of the cryptographic information supply device 11, or receive the broadcast from the beginning. The tuner unit TU is controlled by the control circuit 7 so that there is no such situation. Note that when a collective individual contract has not been made or when there is no continuous encryption information from the encryption information supply device 11 and a pay broadcast can be received only for a short time, a decryption A storage unit that stores the decoding information is prepared in advance.

Here, the cipher information supply device 11 is configured as shown in FIG.
Is connected to the card writing terminal 30 in advance (before viewing the scrambled pay broadcast), and in this state, according to the amount of money charged to the fee storage unit 18 of the card writing terminal 30 in this state. In the card storage terminal 14 of the cryptographic information supply device 11 from the card writing terminal 30, data (hereinafter referred to as the remaining amount) indicating the allowable reception range according to the prepaid amount such as the time, amount and frequency of receivable pay broadcasting. (Referred to as time).

By connecting the cryptographic information supply device 11 storing the data indicating the prepaid remaining time (receivable range) as described above to the receiver as shown in FIG. The machine is configured to be ready for receiving pay broadcasts. Here, in the present embodiment, when the cryptographic information supply device 11 is connected to the receiver, or when the reception of the pay broadcast is selected, or when the remaining amount of the prepaid amount becomes zero or becomes small, the constant value is set. Time The remaining time of the cryptographic information supply device 11 is displayed on a display unit in the display control operation unit 6.

When the cryptographic information supply device 11 having the remaining time is connected to the receiver and the reception operation of the pay broadcast is selected and operated,
From the data control signal extracted from the decoder 2, the presence / absence of encryption, a broadcasting station code, encrypted data for scramble decryption, and the like are read out. The continuous supply of decryption information for operating the decryption device 3 is maintained. As a result, the receiver of this embodiment can receive a pay broadcast.

During the reception of the scrambled pay broadcast, the timer 3 inside the receiver operates to input elapsed time data to the encryption information supply device (IC card or the like) 11. Thereby, on the side of the cryptographic information supply device 11,
Based on the input elapsed time data, the remaining time (receivable time) stored inside (card storage device 14) is subtracted. At the same time, the pay broadcast station code, the corresponding broadcast reception real-time data, the broadcast reception time (reception start / end time), and the like are also stored in the encryption information supply device 11. The reason for doing so is to make it possible to know later the actual use of each broadcasting station, to distribute the usage fee to broadcasters based on the actual use, and to use data for creating audience ratings. In order to obtain

Further, in this embodiment, even if the remaining time of the cryptographic information supply device (such as an IC card) 11 is exhausted, the intention to pay the fee later is shown to the system, so that the system can be operated within a predetermined time limit. Can receive pay broadcasts. That is, when the remaining time of the cryptographic information supply device 11 becomes shorter than a certain time, the receiver displays the remaining time or an alarm signal on the display unit of the display control operation unit 6 or outputs the signal to the output circuit 5. By issuing an alarm sound signal from the user or the like, the user is notified that the remaining time for receiving the pay broadcast in the encrypted information supply device 11 is running short. As a result, the user who knows that the remaining time of the cryptographic information supply device 11 has become short desires to continue to receive pay broadcast even after the remaining time of the cryptographic information supply device 11 has run out. in case of,
This is instructed to the receiver by key input in the display control operation unit 6. This allows the receiver to operate the encryption information supply device 11.
Even after the remaining time of the device has run out, a mode is set in which a pay broadcast can be received for a period of time within a predetermined time limit. , The decryption device 3 is configured to continue supplying decryption information.

In this case (after the remaining time of the cryptographic information supply device 11 is exhausted), the cryptographic information supply device 11 stores the elapsed time data (paid broadcast reception actual time data) input from the receiver. Are added and stored as postpaid fee time data. At the same time, pay station code,
Data such as the broadcast reception time (reception start / end time) is also stored in the encryption information supply device 11.

Here, the remaining time in which pay broadcasting can be received is zero, or the cryptographic information supply device (IC card or the like) 11 in which the remaining time is short is replaced with a gas station, for example.
When connected to the card writing terminal 30 installed at an appropriate place such as a service area on the roadside, a convenience store, or the like, the remaining time (including zero) of the cryptographic information supply device 11 and the postpaid fee time data described above are encrypted. If the information is stored in the information supply device 11, a postpaid fee, etc.
It is displayed on the display unit 19 of the card writing terminal 30. In this state, when the user inserts money into the charge storage section 18 of the card writing terminal 30, the payment processing of the postpaid fee and the setting of the remaining time in which new pay broadcasting can be received are performed in accordance with the payment amount. You can do it.

At this time, the reception real-time data for each pay broadcast station stored in the encryption information supply device 11 is read by the card writing terminal 30 and written into the storage device 16 of the card writing terminal 30. And
The reception time data for each pay broadcast station stored in the card writing terminal 30 is transferred from the card writing terminal 30 to a management station or the like via the communication modem 20 at appropriate timing. As a result, in the management station or the like, the tally of each card writing terminal 30 within a certain period is collected, and the charge storage unit 18 of each card writing terminal 30 is calculated according to the reception time of each pay broadcasting station. The fee for use of pay broadcasting, which has been put into the Internet, is allocated and calculated for each pay broadcasting company according to the actual use.

Further, in this embodiment, as described above, the user makes a collective contract on a monthly basis or the like for each broadcasting station that performs pay broadcasting (or all pay broadcasting stations in a specific area). When a lump-sum contract is concluded, it is possible to receive a scrambled specific pay broadcast by connecting a second cryptographic information supplier (not shown) for the contracted specific pay broadcast to a receiver. I have. In this second encryption information supply device, decryption data for decrypting only a specific contracted pay broadcast and data indicating a valid contract period are written, and during the valid contract period, the second connected to the receiver is written. 2 is configured to enable the supply of the decryption information to the decryption device 3 of the receiver. In the present embodiment, even when a pay broadcast is received using the second encrypted information supply device for receiving a collective contract broadcast, the received pay broadcast station code, broadcast reception Data such as time (reception start / end time) is sent to and stored in the encryption information supply device 11 composed of an IC card or the like.

It should be noted that, when both the cryptographic information supplier 11 composed of an IC card or the like and the second cryptographic information supplier for receiving the collective contract broadcast are connected to the receiver, a specific pay broadcast which has been collectively contracted is received. In this case, the supply of the decryption information from the encryption information supply device 11 is stopped by a command from the receiver,
During this time, the reception time data of the pay broadcast described above from the receiver is not transmitted to the encryption information supply device 11 (subtraction processing of the remaining receivable time in the encryption information supply device 11 is not performed). It has become.

In this embodiment, as described above, when a scrambled pay broadcast is received,
The corresponding broadcast station code, broadcast reception time (reception start / end time) and the like are stored in the encryption information supply device (IC card or the like) 11, which is read by the card writing terminal 30,
In a management station or the like, since the broadcast station code and the broadcast reception time can be calculated and processed, there is an advantage that the data of the rating of each pay broadcast can be easily obtained.

It should be noted that, in addition to the use record of the scrambled pay broadcast, the use record of the normal (free) broadcast without the scramble is also expected to be obtained for the audience rating survey or the like. In such a case, when a normal (free) broadcast is received, the broadcast station code of the received normal broadcast and the broadcast reception time (reception start / end time) are stored in an appropriate memory means inside the receiver. The data stored in the memory means is transferred to and stored in the encryption information supply device (IC card or the like) 11 at an appropriate timing when the encryption information supply device (IC card or the like) 11 is connected to the receiver. Is done. In addition, the second for the collective contract pay broadcast
It is also assumed that the use record of pay broadcasting is required in a state where only the cipher information supplier (i.e., IC card) 11 is not connected to the receiver. In such a case, similarly, when a pay broadcast is received using the second cryptographic information supply device, the broadcast station code of the received pay broadcast and the broadcast reception time (reception start / end time) are
The data stored in the memory means is stored in appropriate memory means inside the receiver at an appropriate timing when the encryption information supply device (IC card or the like) 11 is connected to the receiver. Etc.) 11 and stored. Therefore, with this configuration, when the card writing terminal 30 reads data in the cryptographic information supply device 11, it reads the broadcast station code and the broadcast reception time of the received pay / normal broadcast, thereby providing the pay / read.
It can be used as data for audience rating surveys of all broadcast stations that do not depend on the usual manner.

[0036]

As described above, according to the present invention, when receiving a pay broadcast by region in a mobile body such as a car, it is possible to receive the pay broadcast of the destination without receiving a contract for each pay broadcast individually. It becomes possible, and it becomes possible to fairly distribute the fee for use of pay broadcasting to pay broadcasting companies in accordance with the usage results. Furthermore, according to broadcast reception result data stored in an encryption information supply device such as an IC card,
Aggregation of audience ratings of each broadcasting station can be easily performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a receiver according to one embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a cryptographic information supply device shown in FIG. 1 and a card writing terminal to which the cryptographic information supply device is connected as necessary.

FIG. 3 is an explanatory diagram showing an example of a data format of digital broadcasting according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decoder for taking out a viewing signal 2 Decoder for taking out additional information 3 Decryptor 4 Signal processing circuit 5 Output circuit 6 Display control operation unit 7 Control circuit 8 Timer 9 Interface 10 Receiver ID code 11 Encryption information supply unit 12 Card Interface unit 13 Card control unit 14 Card storage device 15 Card writing terminal interface unit 16 Card writing terminal storage device 17 Card writing terminal control unit 18 Charge storage unit 19 Card writing terminal display unit 20 Communication modem 21 Synchronization signal unit 22 Data control signal section 23 Scramble data 30 Card writing terminal

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasunari Tanaka 2520 Oaza Takaba, Katsuta City, Ibaraki Prefecture Inside the Automotive Equipment Division of Hitachi, Ltd. Inside Hitachi, Ltd. (72) Inventor Tadao Takashima 2-4991 Hironodai, Zama City, Kanagawa Prefecture Xanavi Informatics, Inc. (56) References JP-A-4-120829 (JP, A) JP-A-61-274591 (JP, A) JP-A-5-68250 (JP, A) JP-A-61-108273 (JP, A) JP-A-4-298186 (JP, A) JP-A-5-30509 (JP, A) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) H04H 1/00 H04B 1/16 H04K 1/00 H04N 7/173

Claims (2)

(57) [Claims] 1. A broadcast receiving system for receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed, comprising: a decryption device provided inside a receiver for receiving the pay broadcast. A cryptographic information supplier for providing persistent decryption information from the outside to the receiver to perform decryption, wherein the decryption machine is capable of providing persistent decryption information from the external cryptographic information supplier. It is configured to operate by the supply of, and the external cryptographic information supply device in advance,
In addition to storing data indicating the time at which the pay broadcast signal corresponding to the paid amount can be received, the cryptographic information supply device is connected to the receiver, and when the pay broadcast signal is received, the receiver side At least the paid broadcasting station code and the actual reception time data received from are input to the encryption information supply device and are recordable, and when the total of the actual reception time exceeds the receivable time according to the paid amount, Prohibits the supply of decryption information from the cryptographic information supply device, and reuses the cryptographic information supply device by re-paying an amount according to the receivable time by a separately provided writing device. The writer is capable of receiving, at the time of rewriting, the received pay broadcast station code and the actual reception time as the pay broadcast use result stored in the encryption information supplier. DOO reads, stores and pay station code received as these use record and the actual reception time in the storage device, further, it can be connected via a communication unit and the writing unit
The managed station is configured to store the storage in the writer.
Transfer of the data on the actual use of pay broadcasting stored in the device
Received paid broadcasts within a certain period
According to the total of the station code and the actual reception time,
Amount of comprising means for distributing computing between pay broadcaster, in accordance with the pay broadcast station code received and the actual reception time, the amount which has been paid, characterized in that to enable distributed between pay broadcasters Broadcast receiving system. 2. A broadcast receiving system for receiving a broadcast signal in which an encrypted pay broadcast signal and a normal broadcast signal are mixed, comprising: a decryption device provided inside a receiver for receiving the pay broadcast. A cryptographic information supplier for providing persistent decryption information from the outside to the receiver to perform decryption, wherein the decryption machine is capable of providing persistent decryption information from the external cryptographic information supplier. It is configured to operate by the supply of, and the external cryptographic information supply device in advance,
In addition to storing data indicating the time at which the pay broadcast signal corresponding to the paid amount can be received, the cryptographic information supply device is connected to the receiver, and when the pay broadcast signal is received, the receiver side At least the paid broadcasting station code and the actual reception time data received from are input to the encryption information supply device and are recordable, and when the total of the actual reception time exceeds the receivable time according to the paid amount, Makes it possible to selectively prohibit the supply of cryptographic information from the cryptographic information supplier, and reuses the cryptographic information supplier by re-paying an amount corresponding to the receivable time by a separately provided writer. It is made possible, the writer, at the time of rewriting, the received pay broadcast station code and actual reception time as pay broadcast use results stored in the encryption information supply device Has a function of reading out, when the cryptographic information supply device is connected to the receiver, the receivable time according to the paid amount of the cryptographic information supply device, the actual reception time of the pay broadcast signal If the total is likely to exceed the above, the receiver will not notify the user in advance that the remaining time that can be received has decreased by voice or display, thereby allowing the user to complete the payment. If instructed to continue to receive the pay broadcast signal even after the receivable time according to the amount has expired, or automatically, only for a certain period of time after the receivable time has expired, The supply of the decryption information from the cryptographic information supply device to the receiver is continued, and the paid broadcast station code and the actual reception time data received after the receivable time has expired are transmitted to the cryptographic information supply device. Broadcast receiving system, wherein the excess time can be settled when the rewriting device pays a reuse fee.