JP6053527B2 - Transmitter and receiver - Google Patents

Description

  The present invention relates to a transmission apparatus and a reception apparatus that perform display control of a message displayed on a video of a broadcast program.

In recent years, digital broadcasting such as terrestrial digital broadcasting, BS digital broadcasting, and CS digital broadcasting has become widespread, and it is possible to enjoy various services such as high-quality video / audio services, data broadcasting, and interactive services in general homes. It has become.
In such digital broadcasting, a message indicating that no contract has been made on the screen (video) of a receiving device that has not made a broadcast contract or a reception contract for pay broadcasting in order to restrict viewing of broadcast programs depending on the presence or absence of the contract. Is displayed (for example, see Non-Patent Document 1). This message is deleted when the viewer contacts the broadcaster's call center by telephone or the like and registers the receiving device.
In this case, in a receiving apparatus that has received a broadcast program that requires the presence or absence of a contract, a message indicating that the contract has not been performed is displayed on all the receiving apparatuses that are not registered. Then, in the case of a popular broadcast program that many viewers pay attention to, a large number of telephone calls (calls) to the call center from viewers who want to subscribe to the broadcast program at the same time, the broadcaster side There was a problem that it could not handle all of them.

In order to solve this problem, the inventors of the present application do not display messages all at once on the receiving devices that have received the corresponding broadcast program, but further limit the receiving devices that are not registered therein. A method for displaying a message on the screen has been proposed (see, for example, Patent Document 1).
The technique described in Patent Document 1 groups receiving apparatuses that receive messages by EMM individual messages. In this method, the group is further sub-grouped by mask information using the EMM common message, and the message is displayed on the receiving device in units of sub-groups.
Accordingly, for example, the technique described in Patent Literature 1 groups receiving devices according to whether or not they are registered, further subgroups groups of receiving devices that are not registered, and distributes the timing for displaying messages. be able to.

JP 2011-071955 A

The Japan Radio Industry Association, “Access Control Method for Digital Broadcasting Standard ARIB STD-B25 6.2 Edition”, September 25, 2012, p. 27-36

In the method of Patent Document 1, since receiving devices that display messages can be sub-grouped and messages can be displayed at different timings, inquiries from viewers are distributed, and the call volume to a call center that is generated all at once. It is excellent in that it can be suppressed.
However, in the conventional method including the method of Patent Document 1, even when the viewer has already made a contract, if the receiving device is newly purchased, the receiving device is not contracted. Message is displayed, and registration of the receiving device is required separately.

  That is, in the conventional method, when a viewer newly purchases a receiving device, a message is displayed on the receiving device regardless of whether or not the viewer is a subscriber. It includes the call origination factors. In addition, when the contractor installs (purchases) the second and subsequent receivers, the conventional method involves registering the contractor by telephone to the call center or registering the Internet using a PC (personal computer) or the like. There is a problem that it takes the same effort as when the first receiving device is registered.

  The present invention has been made in view of such a problem. In the second and subsequent receiving apparatuses of the contractor, transmission that can easily register the receiving apparatus without using a call center or the like. It is an object to provide an apparatus and a receiving apparatus.

  In order to solve the above-described problem, the transmission device according to claim 1 includes a content, a message to be displayed in combination with the content, and message control information indicating whether or not to display the message depending on presence / absence of registration. A transmission apparatus that multiplexes and transmits as a broadcast stream, comprising: a cancellation code generation means, a cancellation code information transmission means, a cancellation code information reception means, a cancellation code verification means, and a message control information transmission means; did.

In such a configuration, the transmission device generates a contractor-specific release code for erasing the message display from the contractor-specific identifier input as the contractor registration information by the release code generation means, for example, using a hash operation or the like. Generate.
Then, the transmission device transmits the release code information including the release code and the contractor-specific identifier to the reception device specified by the identifier unique to the reception device input as the registration information of the contractor by the release code information transmission unit. Send. As a result, for example, the release code and the identifier unique to the contractor are notified to the receiving apparatus registered in advance by telephone or the like.

Further, the transmission device receives the release code information from the unregistered receiving device of the contractor by the release code information receiving means. As a result, the transmitting apparatus can recognize which receiving apparatus the contractor wants to register.
Then, the transmission device receives the release code received by the release code verification unit according to whether or not the release code included in the release code information received by the release code information reception unit matches the release code generated by the release code generation unit. Verify whether is valid.
Thus, when the cancellation code is valid, the broadcaster can perform registration by associating the identifier unique to the contractor notified by the cancellation code information with the unregistered receiving device of the contractor.

  Further, the transmission device generates message control information indicating that the message display is to be deleted when the cancellation code verification unit verifies that the cancellation code is valid by the message control information transmission unit, and generates the cancellation code. Is transmitted to an unregistered receiving apparatus. As a result, the receiving device that has received the message control information can delete the message.

  Further, the transmission device according to claim 2 includes storage means for storing the identifier unique to the contractor and the number of reception devices from which the message display is erased in association with the transmission device according to claim 1. The release code verification means further corresponds to the identifier unique to the contractor, and the number of receiving devices that have deleted the display of the message stored in the storage means has reached a predetermined maximum number The release code is determined to be invalid.

  In such a configuration, the transmitting device can prevent the receiving device from being registered without limitation using the transmitted release code.

  Further, the transmission device according to claim 3 is the transmission device according to claim 1 or 2, wherein the release code information reception unit further starts from the time when the release code verification unit generates the release code. When the elapsed time until the time when the release code information is received exceeds a predetermined valid period, the received release code is determined to be invalid.

  In such a configuration, the transmission apparatus can set an expiration date for the cancellation code by the cancellation code verification means. This eliminates the need to register by telephone or the like when registering another receiving device within the validity period after the first receiving device is registered.

  The reception device according to claim 4 receives a broadcast stream in which content, a message to be combined with the content and displayed, and message control information indicating whether to display the message are multiplexed. In the receiving device comprising message text information receiving means for controlling whether or not to output the message to the combining means for combining with the content based on the message control information, the release code information receiving means, the release code information, A display means, a release code information input means, and a release code information transmission means are provided.

  In such a configuration, the receiving device uses the release code information receiving unit to release from the transmitting device the cancellation code information that includes the cancellation code that deletes the display of the message generated from the contractor-specific identifier and the contractor-specific identifier. Receive. As a result, for example, the release code and the identifier unique to the contractor are notified to the receiving apparatus registered in advance by telephone or the like.

Then, the receiving device displays the release code information received by the release code information receiving unit by the release code information display unit. That is, when the receiving device functions as a receiving device to be registered first, release code information that enables registration with another unregistered receiving device is presented to the contractor.
Further, the receiving device inputs the release code information displayed on the other receiving device registered by the contractor as the release code information for registration request indicating the registration request of the receiving device by the release code information input means. . That is, when the receiving device functions as an unregistered receiving device, the release code information displayed on another receiving device that has already been registered is input.

Then, the reception device transmits the release code information input by the release code information input unit to the transmission device by the release code information transmission unit. As a result, even an unregistered receiving device can be registered by notifying the transmitting device of the release code.
In addition, when the message text information receiving unit receives message control information indicating that the message display information is to be erased, which is transmitted as a result of verifying that the release code information is valid from the transmitter, Is stopped from being output to the synthesizing means. As a result, the message at the registered receiving apparatus is deleted.

  Further, the receiving device according to claim 5 is the receiving device according to claim 4, further comprising a storage means for storing the release code information received by the release code information receiving means.

  In such a configuration, the receiving device reads the release code information from the storage unit and displays it when instructed from the outside by the release code information display unit. Thus, when registering the second and subsequent receiving devices, it is not necessary to register at the same time as the first receiving device, and the receiving device can be registered at a timing shifted in time.

  Further, the receiving device according to claim 6 is the receiving device according to claim 5, wherein the release code information input means inputs the release code information displayed on the other receiving device registered by the contractor. When this is done, the release code information is stored in the storage means.

  In such a configuration, the receiving device can present a release code for setting to an unregistered receiving device even if it is a receiving device registered later instead of the receiving device registered first.

The present invention has the following excellent effects.
According to the first and fourth aspects of the present invention, the contractor simply reads out the release code information set in the registered receiving device and inputs it to the unregistered receiving device. Since the registration of the receiving device is completed, the receiving device can be easily registered without going through a call center or the like. This also allows the present invention to reduce the call volume to the call center.

  According to the second and third aspects of the invention, quantitative and / or time restrictions can be imposed on the release code. Accordingly, the present invention can prevent a large number of receiving devices from being illegally registered.

  According to the fifth aspect of the present invention, even when there is a difference in registration time between the first receiving device and the second and subsequent receiving devices, the first registered receiving device stores the difference. Therefore, the second and subsequent receivers can be registered without going through a call center or the like.

  According to the sixth aspect of the present invention, since the release code information is stored in the second and subsequent receivers, the reception code registered in the second and subsequent receivers is not limited to the first registered receiver. The release code information can also be confirmed by the device.

It is explanatory drawing for demonstrating the outline | summary of the message display control system (digital broadcasting system) which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the transmitter which concerns on 1st Embodiment of this invention. It is a data structure figure which shows the example of the data structure of message text information. It is a data structure figure which shows the example of the data structure of message control information. It is a data structure figure which shows the example of the data structure of cancellation | release code information. It is a data structure figure which shows the example of the data structure of the message control information containing cancellation code information. It is a block diagram which shows the structure of the receiver which concerns on 1st Embodiment of this invention. It is a flowchart which shows the registration operation | movement of the 1st receiver in the message display control system (digital broadcasting system) which concerns on 1st Embodiment of this invention. It is a flowchart which shows the registration operation | movement of the 2nd or subsequent receiver in the message display control system (digital broadcasting system) which concerns on 1st Embodiment of this invention. It is a flowchart which shows verification operation | movement of the cancellation | release code | symbol of the transmitter which concerns on 1st Embodiment of this invention. It is explanatory drawing for demonstrating the outline | summary of the message display control system (digital broadcasting system) which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the transmitter which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the receiver which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the registration operation | movement of the 1st receiver in the message display control system (digital broadcasting system) which concerns on 2nd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
<< First Embodiment >>
[Overview of message display control system]
First, an outline of a message display control system S by digital broadcasting according to the first embodiment of the present invention will be described with reference to FIG.
The message display control system S is composed of a digital broadcast transmission device 1 owned by a broadcaster and digital broadcast reception devices 2, 2,... A message to be displayed on the screen of the receiving device 2 is controlled according to whether or not the receiving device 2 has been registered (hereinafter simply referred to as a contract). Digital broadcasting is terrestrial digital broadcasting, satellite broadcasting, cable broadcasting, etc., and may be wireless broadcasting or wired broadcasting.
The message display control system S deletes the message by registering the _first receiver 21 by telephone, the Internet, etc., as in the past, but the second and subsequent receivers 2 ₂ , ₂ , As for 2 ₃ ,..., Registration is performed only by operating the receiving device 2 and the message is deleted.

An outline of the operation will be described with reference to FIG.
First, the first unit of the receiving device 2 _1, the viewer, by telephone, etc., and the receiver 2 ₁ unique ID (receiver ID1), address, and personal information such as name as the registered information, the broadcaster (Step S1).

Then, broadcasters, from the transmission device 1, a signal (message control information) for instructing message erasure, as individual information to the receiving apparatus 2 _first receiver ID1, notified by the broadcast wave W (Step S2). In addition, the transmitting apparatus 1 notifies the release code, which is a code for the second and subsequent receiving apparatuses 2 to delete the message, as broadcast information W as individual information to the receiving apparatus 2 of the receiver ID1 (step S1). S3). The unlock code is held in the reception apparatus 2 _1.

Then, the viewer, a second or subsequent reception device 2 (here, the receiving apparatus 2 ₂₎ when registering, to display the release code to the receiving device 2 _first screen (step S4), and the release code the inputs to the receiving apparatus _{2 2} (step S5).
Then, the receiving apparatus _{2 2} via the communication line N, and the receiver _{2 2} unique ID (receiver ID2), and transmits the cancel code to the transmitting device 1 (step S6).

Then, the transmission device 1 notifies a signal (message control information) for instructing message erasure as individual information to the reception device 22 of the receiver ID ₂ through the broadcast wave W (step S7). Thus, on the screen of the message in the receiving device 2 ₂ is erased.
As described above, the second and subsequent receiving apparatuses 2 can be registered and erased with a simple procedure by simply inputting the release code.
Hereinafter, the transmitter 1 and the receiver 2 according to the first embodiment of the present invention will be described in detail.

[Configuration of transmitter]
First, the configuration of the transmission apparatus 1 according to the first embodiment of the present invention will be described with reference to FIG. 2 (refer to FIG. 1 as appropriate).
The transmission device 1 transmits content (broadcast program) to the reception device 2 via the broadcast wave W. The transmission device 1 also has a function of transmitting a message to be displayed as an overlay on the video as a text character via the broadcast wave W and controlling the display.
Here, the transmission apparatus 1 includes a content distribution unit 10, a common information generation unit 11, an individual information generation unit 12, a multiplexing unit 13, a release code generation unit 14, a time counting unit 15, and a storage unit 16. , Communication control means 17, release code information receiving means 18, and release code verification means 19.

The content distribution unit 10 distributes the input content to the receiving device 2. The content distribution unit 10 encodes a video signal, an audio signal, and the like constituting the input content and outputs the encoded video signal and audio signal to the multiplexing unit 13. For example, the content distribution unit 10 encodes the content using MPEG-2 TS or the like.
Note that the content distribution unit 10 may be configured to cryptographically distribute the content by a limited reception method in which the content is scrambled with a scramble key and transmitted together with related information of the scrambled key in order to limit access to the content.

  The common information generation unit 11 generates information (common information) to be transmitted to the receiving device 2 in common. Here, the common information generating unit 11 includes a message text information transmitting unit 11a.

  The message text information transmitting unit 11 a generates message text information including a character string (text code) of a message text to be displayed on the receiving device 2 and transmits the message text information to the receiving device 2. The message text information can be generated as an EMM common message defined by ARIB STD-B25. Here, the message text information transmission unit 11 a receives the message text, the message control information ID, and the text display position from the outside, generates message text information as an EMM common message, and outputs the message text information to the multiplexing unit 13.

Here, the message text is a character string (code string) of the message and is, for example, a sentence indicating that no reception contract is made. The message control information ID is an identifier for specifying the message text.
The text display position is information indicating where the message is displayed on the display screen. For example, the position in the horizontal direction of the screen (left, middle, right), the position in the vertical direction of the screen (up, middle, lower) Is information indicated by a predetermined bit value. However, the text display position is not essential information.
For example, as shown in FIG. 3, the message text information transmitting unit 11a generates message text information by arranging the message control information ID in the header portion and the message text and the text display position in the payload portion.

  The individual information generating unit 12 generates information (individual information) to be individually transmitted to each receiving device 2. Here, the individual information generation unit 12 includes a message control information transmission unit 12a and a release code information transmission unit 12b.

  The message control information transmission unit 12a is a message text to be displayed on the individual reception device 2 among the message texts generated by the common information generation unit 11 (message text information transmission unit 11a) and transmitted to the reception device 2 in common. Message control information, which is information for identifying the message, is generated and transmitted to the receiving device 2. Note that the message control information can be generated as an EMM individual message defined in ARIB STD-B25. Here, the message text information transmission unit 11 a receives the receiver ID and the message control information ID from the outside, generates message control information as an EMM individual message, and outputs the message control information to the multiplexing unit 13.

Here, the receiver ID is an identifier for specifying the receiving device 2 and is, for example, an IC card number (IC card number) distributed in advance to the receiving device 2.
The message control information ID is an identifier for specifying the message text included in the message text information generated as common information by the message text information transmitting unit 11a.

In order to delete the message on the screen of the receiving device 2, a predetermined unique value (for example, 0x0000) is set in the message control information ID.
Here, the message control information transmission means 12a also receives the message ID from the release code verification means 19 when the receiver ID and the message control information ID that is a value for deleting the message (for example, 0x0000) are input. Control information is generated and output to the multiplexing means 13.

  The message control information transmitting unit 12a generates message control information by associating at least the message control information ID with the receiver ID. For example, as shown in FIG. 4, the message control information transmitting unit 12a generates message control information by arranging a receiver ID in the header portion and a message control information ID in the payload portion.

The cancellation code information transmission unit 12b transmits the cancellation code information, which is information for deleting a message in the reception device 2, to the reception device 2.
Here, the release code information transmission means 12b receives the receiver ID from the outside, reads the release code information corresponding to the receiver ID from the storage means 16, and outputs it to the multiplexing means 13. Here, the receiver ID is an identifier (IC card number or the like) that identifies the target receiving device 2 with which the viewer has made the contract.

  The release code information can be generated as an EMM individual message defined in ARIB STD-B25. For example, as shown in FIG. 5, the release code information transmission means 12b arranges the receiver ID in the header part and the release code, the contractor ID and the date / time information in the header part as the release code information. And transmitted to the receiving device 2. The contents of the release code information (release code, contractor ID, date and time information) will be described in the description of the release code generation means 14.

  Multiplexing means 13 includes content distributed by content distributing means 10, common information generated by common information generating means 11 (message text information), and individual information generated by individual information generating means 12 (message control information, release code). Information) is multiplexed at the input stage and transmitted as a broadcast stream.

Here, it is assumed that the multiplexing means 13 multiplexes each input information into a TS (transport stream) format (MPEG-2 TS) defined by MPEG-2 Systems. The broadcast stream multiplexed in this way is transmitted to the receiving device 2 via the broadcast wave W. Here, the broadcast stream is transmitted via the broadcast wave W, but may be transmitted via the communication line N.
Although not shown here, the multiplexing unit 13 appropriately multiplexes the PSI (Program Specific Information) / SI (Service Information) information table as program arrangement information in addition to these pieces of information. Needless to say.

  The cancellation code generation means 14 generates a cancellation code that is a code for deleting a message in the receiving device 2. Here, the release code generation unit 14 generates a release code at the timing when the contractor ID and the receiver ID are input from the outside, and stores them in the storage unit 16 as release code information associated with the receiver ID. Here, the contractor ID is an identifier unique to the contractor given when the viewer makes a contract such as a broadcast contract or a reception contract for a pay broadcast in advance with the broadcaster. The receiver ID is an identifier (IC card number or the like) that identifies the target receiving device 2 with which the viewer has made the contract.

  The cancellation code generation means 14 generates a cancellation code using the input contractor ID as a seed. For example, the cancellation code generation means 14 adds a predetermined value, which is secret information by the broadcaster, to the subscriber ID, performs a hash calculation, and uses the hash value that is the calculation result as the cancellation code.

  Since the release code is transmitted to the receiving device 2 and used as a code for deleting the message, it is preferable to provide a restriction for preventing unauthorized use in using the release code. Therefore, here, the number of receiving apparatuses 2 (cancelled number) from which the same contractor can cancel (erase) the message and the expiration date that can cancel the message are set as the usage restrictions on the cancellation code.

  The cancellation code generation unit 14 verifies the cancellation code based on the number of cancellations in the cancellation code verification unit 19, and therefore, when the contractor ID and the receiver ID are input, the storage unit 16 stores the contractor ID (release The initial value (“1”) of the number of cancellations is stored in association with the code information. If the same contractor ID already exists, “1” may be added to the number of canceled units.

Further, the release code generation unit 14 further adds the date and time information (for example, date) counted by the time measuring unit 15 to the release code information so that the release code verification unit 19 verifies the release code based on the expiration date. It will be added. When the release code information is generated including the date information and stored in the storage unit 16, the release code information transmission unit 12b does not necessarily need to transmit the date information to the receiving device 2.
The verification of the cancellation code based on the number of cancellations and the expiration date will be performed in the description of the cancellation code verification means 19.

  Since the release code information is used as information input by the viewer in the receiving device 2, in order to prevent tampering, the release code information is configured as one piece of code information that concatenates the release code, the contractor ID, and the date and time information. It is preferable to add error detection data such as CRC (Cyclic Redundancy Check).

  The time measuring means 15 is a general timer that measures time. This time measuring means 15 measures, for example, year / month / day / hour / minute / second. The time counted by the time measuring means 15 is referred to by the release code generation means 14 or the release code verification means 19 for the necessary time (for example, date).

  The storage means 16 stores cancellation code information and the number of receivers 2 (the number of cancellations) from which the contractor has erased the message in association with the contractor ID that is an identifier unique to the contractor. It is a general storage medium such as a memory. The cancellation code information stored in the storage unit 16 is set by the cancellation code generation unit 14. In addition, the number of cancellations stored in the storage unit 16 is set to an initial value by the cancellation code generation unit 14 and incremented by the cancellation code verification unit 19.

The communication control means 17 receives communication data transmitted from the receiving device 2 via the communication line N.
The cancellation code information receiving unit 18 receives the cancellation code information as communication data via the communication control unit 17. The release code information receiving unit 18 outputs the received release code information to the release code verification unit 19.

  The cancellation code verification means 19 verifies the cancellation code information received by the cancellation code information reception means 18. Here, the cancellation code verification means 19 includes a code value verification means 19a, a cancellation number verification means 19b, and an expiration date verification means 19c.

The code value verification means 19a determines whether the release code received by the release code information receiving means 18 is valid depending on whether the release code included in the release code information matches the release code generated by the release code generation means 14 or not. It is to verify whether or not.
The code value verification means 19a generates a release code using the contractor ID as a seed in the received release code information (see FIG. 5). Note that the generation method of the cancellation code is the same as the generation method of the cancellation code in the cancellation code generation unit 14.
The code value verification unit 19a determines that the release code is valid if the release code generated using the contractor ID as a seed matches the release code included in the received release code information. Is determined to be invalid.

The number-of-cancellation verification unit 19b verifies whether or not the cancellation code is valid depending on whether or not the number of receiving apparatuses 2 whose message display has been canceled by the cancellation code exceeds a predetermined number.
In the received release code information (see FIG. 5), the number-of-cancellation verification unit 19b determines that the number of cancellations stored in the storage unit 16 corresponding to the contractor ID does not reach the predetermined maximum number. The cancellation code is determined to be valid as a verification result based on the number of cancellations. On the other hand, if the number of cancels has reached the predetermined maximum number, the cancel unit verification means 19b determines that the cancel code is invalid as a verification result based on the number of cancels.

The expiration date verification means 19c verifies whether or not the cancellation code is valid based on the elapsed time from the date and time when the cancellation code was generated.
This expiration date verification means 19c is configured to determine the elapsed time from the date / time information included in the received release code information (see FIG. 5) to the date / time information timed by the time counting means 15 at a predetermined expiration date ( For example, if it is less than one month), the cancellation code is determined to be valid as a verification result based on the expiration date. On the other hand, if the elapsed time exceeds the expiration date, the expiration date verification unit 19c determines that the release code is invalid as a verification result based on the expiration date.
When the cancellation code information is stored in the storage unit 16 including the date / time information, the expiration date verification unit 19c measures the time from the date / time information stored in the storage unit 16 at the present time. The expiration date may be verified based on the elapsed time until the date information.

Then, the cancellation code verification unit 19 determines that the cancellation code is valid in any of the verification results in the code value verification unit 19a, the cancellation number verification unit 19b, and the expiration date verification unit 19c. Is determined to be valid, and a message deletion instruction is notified to the message control information transmission unit 12a of the individual information generation unit 12.
That is, the cancellation code verification means 19 uses the receiver ID included in the received cancellation code information and the message control information ID that is a value for deleting the message (for example, 0x0000) as an instruction to delete the message. The message control information transmission unit 12a is notified. As a result, the message of the receiving device 2 corresponding to the receiver ID is deleted.

Further, when it is determined that the release code is valid, the release code verification unit 19 outputs the receiver ID and the contractor ID included in the received release code information to the outside as registration information.
Accordingly, the broadcaster can recognize that the contractor specified by the contractor ID has registered the receiving device 2 corresponding to the new receiver ID without receiving notification by telephone or the like. .
When information added with error detection data is used as the release code information, the release code verification means 19 performs error detection such as CRC, and if there is an error, determines that the release code is invalid, and each verification means 19a, Verification by 19b and 19c is omitted.

  By configuring the transmission device 1 as described above, the transmission device 1 can transmit to the reception device 2 release code information for simple registration by the second and subsequent reception devices 2. it can. Further, the transmission device 1 can delete the message in the reception device 2 by acquiring the release code information from the second and subsequent reception devices 2.

Here, the individual information generation means 12 generates the message control information and the release code information as individual information and transmits them to the receiving device 2, but the release code information is sent to the message control information. It may be included and transmitted.
That is, as shown in FIG. 6, the message control information transmitting means 12a arranges the receiver ID in the header part and the message control information ID, the release code, the contractor ID and the date / time information in the header part as message control information. The EMM individual message may be transmitted to the receiving device 2.
As described above, the cancellation code information transmission unit 12b may be omitted from the configuration of the transmission device 1 so that the message control information transmission unit 12a has the function of the cancellation code information transmission unit 12b.

[Receiver configuration]
Next, the configuration of the receiving device 2 according to the first embodiment of the present invention will be described with reference to FIG. 7 (refer to FIG. 1 as appropriate).
The receiving device 2 receives content (broadcast program) via the broadcast wave W. In addition, the receiving device 2 has a function of combining and displaying a message on a video (screen) by a signal transmitted via the broadcast wave W, or deleting the message.
Here, the receiving device 2 includes a separating unit 20, a content receiving unit 21, a synthesizing unit 22, a common information processing unit 23, an individual information processing unit 24, a storage unit 25, and a release code information display unit 26. , Release code information input means 27, release code information transmission means 28, and communication control means 29.

  The separation means 20 separates the broadcast stream (multiplexed signal; MPEG-2 TS) transmitted from the transmission apparatus 1. The separating unit 20 separates content, common information (message text information), and individual information (message control information and release code information) from the MPEG-2 TS.

The content receiving unit 21 receives the content separated and extracted by the separating unit 20. The content receiving unit 21 decodes the received content encoded by MPEG-2 or the like and outputs the decoded content to the synthesizing unit 22.
The content receiving means 21 may receive the content scrambled with the scramble key and the related information of the scrambled key, and decrypt the content by the limited reception method.

  The synthesizing unit 22 synthesizes the message text output from the message text information receiving unit 23 a with the content received by the content receiving unit 21. The synthesizing unit 22 displays the message text in an overlay manner at a predetermined position on the content video or at a designated text display position.

  The common information processing unit 23 receives common information (common information) that is separated and extracted by the separation unit 20 with respect to the receiving device 2. More specifically, the common information processing means 23 receives an EMM common message. Here, the common information processing means 23 includes message text information receiving means 23a.

The message text information receiving unit 23a receives message text information transmitted as common information from the transmission device 1. The message text information is information generated by the message text information transmission unit 11a (see FIG. 2) of the transmission apparatus 1, and is information in which the message text is associated with the message control information ID (see FIG. 3).
The message text information receiving unit 23a is included in the message text information only when the message control information ID included in the message text information matches the message control information ID stored in the storage unit 25. The message text is output to the synthesis means 22. When the text display position is included in the message text information, the message text information receiving unit 23a outputs the text display position to the synthesizing unit 22 together with the message text.
If the message control information ID stored in the storage means 25 is a predetermined value (for example, 0x0000) indicating message erasure, the message text information receiving means 23a outputs to the combining means 22 Not performed.

  The individual information processing unit 24 receives individual information (individual information) from the receiving device 2 separated and extracted by the separating unit 20. More specifically, the individual information processing means 24 receives an EMM individual message. Here, the individual information processing unit 24 includes a message control information receiving unit 24a and a release code information receiving unit 24b.

The message control information receiving unit 24a receives message control information transmitted as individual information from the transmission device 1. This message control information is information generated by the message control information transmission means 12a (see FIG. 2) of the transmission device 1, and is information in which the message control information ID is associated with the receiver ID (see FIG. 4). .
The message control information receiving unit 24a extracts message control information corresponding to the receiver ID stored in the storage unit 25 from the EMM individual message, and sets the message control information ID included in the extracted message control information. It is written and stored in the storage means 25.

The release code information receiving unit 24b receives release code information transmitted as individual information from the transmission device 1. The release code information is information transmitted from the release code information transmission unit 12b (see FIG. 2) of the transmission device 1, and is information in which the release code, the contractor ID, and the date / time information are associated with the receiver ID. Yes (see FIG. 5).
The release code information receiving unit 24b extracts release code information corresponding to the receiver ID stored in the storage unit 25 from the EMM individual message, and the release code and contractor included in the extracted release code information. The ID and date / time information are written and stored in the storage means 25. As shown in FIG. 6, when the message control information ID is included in the release code information, the release code information receiving unit 24 b also writes and stores the message control information ID in the storage unit 25.

  The storage means (message control information storage means, release code information storage means, receiver ID storage means) 25 stores various types of information. Here, the memory | storage means 25 memorize | stores message control information ID, cancellation code information (release code, date information, and contractor ID), and receiver ID.

Here, the message control information ID is information written by the message control information receiving unit 24a.
Further, the release code information (release code, date information and contractor ID) is information written by the release code information receiving unit 24b or the release code information input unit 27. That is, the release code information is written by the release code information receiving unit 24b when the receiving device 2 is a receiving device registered by the viewer by telephone or the like. Further, the release code information is written by the release code information input means 27 when the viewer himself / herself sets it.
The receiver ID is an identifier unique to the receiving device 2 and is information stored in the storage unit 25 in advance.

Here, the storage unit 25 is illustrated as one storage unit, but each piece of information may be stored in an individual storage unit.
For example, the message control information ID is stored in a message control information storage means constituted by a semiconductor memory or the like, and the release code, date information and contractor ID are stored in a release code information storage means constituted by another semiconductor memory or the like. . Further, the receiver ID is stored in an IC card distributed in advance to the receiving device 2.

The release code information display means 26 displays the release code information stored in the storage means 25 on the display device that displays the illustration.
The cancellation code information display means 26 is stored in the storage means 25 by selecting the display of the cancellation code information, for example, by selecting the cancellation code information display screen from the menu screen by an input unit (not shown). The release code, date / time information, and contractor ID are displayed on the screen of the display device. When the release code information is configured as one piece of code information by adding error detection data to the release code, date / time information, and contractor ID, the code information is displayed on the screen.
Thus, the viewer can recognize the release code information set in the second and subsequent receiving apparatuses 2.

The cancellation code information input means 27 inputs cancellation code information (cancellation code information for registration request) by an input means not shown.
The cancellation code information input means 27 is a screen provided with a column for inputting the cancellation code information on the screen by selecting the input of the cancellation code information, for example, selecting the cancellation code information input screen from the menu screen. And enter the release code information.
Then, the cancellation code information input means 27 writes the input cancellation code information (cancellation code, date / time information and contractor ID) in the storage means 25, and notifies the cancellation code information transmission means 28 that the cancellation code information has been input. Notice.

  The cancellation code information transmission unit 28 transmits the cancellation code information input by the cancellation code information input unit 27 to the transmission device 1 via the communication control unit 29. The release code information transmission means 28 reads the release code information stored in the storage means 25 and outputs it to the communication control means 29.

  The communication control unit 29 transmits the release code information output from the release code information transmission unit 28 to the transmission device 1 via the communication line N. It is assumed that the address (for example, IP address) of the transmission apparatus 1 is known in advance.

By configuring the receiving device 2 as described above, in the case of the receiving device 2 to be set first, the receiving device 2 provides release code information for simply registering with the second and subsequent receiving devices 2. It can be acquired from the transmission device 1 via the broadcast wave W and displayed. Further, in the case of the second and subsequent receivers 2, the receiver 2 can simply register and erase the message simply by inputting the release code information.
The receiving device 2 can be operated by a program (digital broadcast receiving program) for causing a computer to function as each of the means described above. This digital broadcast receiving program can be operated on, for example, a PC (personal computer).

[Operation of message display control system]
Next, the operation of the message display control system S will be described with reference to FIGS. Since the content transmission / reception operation is a general operation, the description thereof is omitted here, and the message text display control operation associated with the registration of the receiving device 2 will be described.

(Registering the first receiver)
First, the registration operation of the _first receiver 2 ₁ (2) will be described with reference to FIG. 8 (see FIGS. 1, 2 and 7 as appropriate). Here, for convenience, the “first device” is referred to, but the “first device” refers to the receiving device 2 that performs registration by telephone, the Internet, or the like.

First, the viewer, telephone, by Internet, etc., and the receiver 2 ₁ unique ID (receiver ID1), address, and personal information such as name as registration information, notify the broadcasters (step S10), and The broadcaster acquires registration information (step S11).

  Then, the transmission device 1 receives the receiver ID notified as the registration information and the message control information ID (= 0x0000) indicating the deletion of the message from the outside, so that the message control information of the individual information generating unit 12 is received. Message control information (see FIG. 4) is generated by the transmission means 12a (step S12), and is multiplexed and transmitted to the broadcast stream via the multiplexing means 13 (step S13).

On the other hand, the receiving apparatus 2 ₁ separates the broadcast stream by the separating means 20, the message control information receiving means 24a of the individual information processing means 24 receives the message control information corresponding to the receiver ID of the receiving apparatus 2 ₁ ( Step S14).
Then, the receiving apparatus _{2 1,} the message control information receiving means 24a, and stores the message control information ID is a message control information received in step S14 a (= 0x0000) in the storage unit 25 (step S15).

In addition, the transmission apparatus 1 receives the receiver ID notified as the registration information and the contractor ID for identifying the viewer who has made the contract from the outside, so that the cancel code generation unit 14 makes the contractor ID. Is used as a seed to generate a release code (step S16). At this time, the release code generation means 14 adds a predetermined value, which is secret information by the broadcaster, to the subscriber ID, performs a hash calculation, and generates a hash value as a release code as a release code. .
Further, the cancellation code generation means 14 generates cancellation code information (see FIG. 5) including the cancellation code, the contractor ID, and the date and time information counted by the timing means 15 (step S17). Then, the transmission device 1 uses the release code generation unit 14 to store the number of cancellations (initial value = “1”) indicating the number of release code information corresponding to the contractor ID in the storage unit 16 in association with the contractor ID. Store (step S18).
Then, the transmission device 1 receives the release code information generated in step S17 by the release code information transmission unit 12b of the individual information generation unit 12 by inputting the receiver ID from the outside as a release code information transmission request. The data is multiplexed and transmitted to the broadcast stream via the multiplexing means 13 (step S19).

On the other hand, the receiving apparatus 2 ₁ separates the broadcast stream by the separating means 20, the release code information receiving means 24b of the individual information processing means 24 receives the release code information corresponding to the receiver ID of the receiving apparatus 2 ₁ ( Step S20).
Then, the receiving apparatus _{2 1,} the release code information receiving means 24b, unlock code information received in step S20 (release code, subscriber ID and the date and time information) stored in the storage unit 25 (step S21).

By the above operation, the receiving apparatus 2 _1, of the received second and subsequent devices 2 _2, 2 3, _... is the release code information for registering simply is stored in the storage means 25.
Further, by the above operation, the receiving apparatus 2 _1, a state in which the message is erased.
That is, in this state, it is assumed that the transmission apparatus 1 generates message text information (see FIG. 3) by the message text information transmission unit 11a of the common information generation unit 11 and multiplexes it into the broadcast stream.
Then, the receiving apparatus 2 _1, message control information ID indicating that erasing the message in the storage unit 25 (= 0x0000) is stored, the message control information ID for identifying the message text contained in the message text information Therefore, the message text information receiving unit 23a of the common information processing unit 23 does not output the message text included in the message text information to the synthesizing unit 22, and the message is not displayed.

(Registering the second receiver)
Next, the registration operation of the second receiving device 2 ₂ (2) will be described with reference to FIG. 9 (refer to FIGS. 1, 2, and 7 as appropriate). Here, for convenience, referred to as "second unit", the "second unit", the telephone, the Internet, etc., is that of the receiving apparatus to be registered after the receiving apparatus 2 ₁ has registered.

First, already in registered receiving apparatus 2 _1, by viewer (contractor) selects the cancellation code information display screen from a menu screen or the like, the receiving apparatus 2 _1, the release code information display means 26, storage means The release code information (release code, contractor ID and date / time information) stored in 25 is displayed on the screen of the display device (step S30).

Then, the receiving apparatus 2 ₂ to be newly registered, the viewer (contractor) is by selecting the cancellation code information input screen from the menu screen or the like, by the release code information inputting means 27, displays the release code information input screen , Receiving an input of the release code information from the viewer (contractor). Then, the release code information input unit 27 writes the input release code information in the storage unit 25 (step S31).
Then, the receiving apparatus 2 _2, the release code information transmitting unit 28, a release code information input in step S31, as communication data via the communication control unit 29, and transmits to the transmitting apparatus 1 (step S32).

On the other hand, the transmitting apparatus 1 receives the release code information by the release code information receiving unit 18 via the communication control unit 17 (step S33).
Then, the transmission apparatus 1 verifies whether or not the cancellation code of the cancellation code information received in step S33 is valid by the cancellation code verification means 19 (step S34). The operation in step S34 will be described in detail later with reference to FIG.

When the cancellation code verifying unit 19 determines that the cancellation code is invalid (No in step S35), the transmission device 1 ends the registration operation.
In this case, the receiver ID that has received the release code information from the release code verification means 19 and the message identifier (message control information ID) indicating that the release code is invalid are stored in the individual information generation means 12. The message control information transmission unit 12a may be notified so that the message is displayed on the reception device 2.

On the other hand, when it is determined that the release code is valid (Yes in step S35), the transmission apparatus 1 corresponds to the contractor ID included in the release code information in the storage unit 16 by the release code verification unit 19. The number of cancellations to be updated is updated ("1" is added) (step S36). Then, in the transmission device 1, the message control information transmission unit 12a of the individual information generation unit 12 has a receiver ID included in the received release code information and a value for deleting the message (for example, 0x0000). Message control information including the message control information ID is generated (step S37).
Then, the transmitting apparatus 1 multiplexes the message control information generated in step S37 with the multiplexing unit 13 and transmits it in the broadcast stream (step S38).

On the other hand, the receiving apparatus 2 ₂ separates the broadcast stream by the separating means 20, the release code information receiving means 24b of the individual information processing means 24 receives the release code information corresponding to the receiver ID of the receiving apparatus 2 ₂ ( Step S39).
Then, the receiving apparatus _{2 2,} the release code information receiving means 24b, unlock code information received in step S39 (release code, subscriber ID and the date and time information) stored in the storage unit 25 (step S40).

By the above operation, the receiving apparatus 2 _2, is registered in the broadcasting provider side, a state in which the message is erased.
Although the registration operation for the _second receiving device 22 has been described here, the same applies to the third and subsequent receiving devices 2.

Next, referring to FIG. 10 (refer to FIG. 7 as appropriate for the configuration), the operation of step S34, that is, the verification operation of the cancellation code verification means 19 will be described in detail.
The cancellation code verification means 19 generates a cancellation code by using the contractor ID included in the received cancellation code information as a seed by the code value verification means 19a (step S341). Then, the release code verification means 19 determines whether or not the release code generated in step S341 matches the release code included in the received release code information by the code value verification means 19a (step S342). ).

  Here, when the release codes match (Yes in step S342), the release code verification means 19 stores the storage means 16 corresponding to the contractor ID included in the received release code information by the release number verification means 19b. It is determined whether or not the number of cancels stored in the table reaches a predetermined maximum number (step S343).

  Here, when the number of cancels does not reach the predetermined maximum number (No in step S343), the cancel code verification unit 19 uses the expiration date verification unit 19c to add the date and time information included in the received cancel code information. Based on this, it is determined whether or not the release code is information within the expiration date (step S344). That is, the expiration date verification unit 19c determines whether or not the elapsed time from the received date / time information to the date / time information timed by the timing unit 15 is less than a predetermined expiration date.

Here, when the date and time information is information within the expiration date (Yes in step S344), the cancellation code verification means 19 sets that the cancellation code is valid in the verification result (step S345), and FIG. The operation returns to step S35.
Needless to say, the operations of step S342, step S343, and step S344 are not necessarily performed in this order, and may be performed in an arbitrary order.

  Then, if the release code generated in step S341 does not match the release code included in the received release code information (No in step S342), the number of released units has reached a predetermined maximum number (step If the expiration date of the release code has passed (No in step S344), the release code verification means 19 sets that the release code is invalid in the verification result (step S346). Then, the operation returns to step S35 in FIG.

When using information with error detection data added as the release code information, the release code verification means 19 performs error detection such as CRC before step S341. If no error is detected, the operation after step S341 is performed. If an error is detected, the operation may be shifted to step S346.
Also, here, verification by the number of cancellations and verification by date information are used for verification of the cancellation code, but any one of these verifications may be used.

  As described above, the message display control system S first registers the receiving device 2 by telephone or the like, and then registers the second and subsequent receiving devices 2 with a simple operation of inputting the release code information. It can be performed. In addition, since the registration of the second and subsequent receivers 2 is not required by telephone or the like, it is possible to reduce the call volume generated at the call center of the broadcaster.

<< Second Embodiment >>
[Overview of message display control system]
Next, referring to FIG. 11, the outline of the message display control system S _B by the digital broadcasting according to a second embodiment of the present invention.
Message display control system S _B includes a transmission device 1B of the digital broadcast broadcaster has the reception apparatus 2B of digital broadcasting which is installed in each home or the like, 2B, is composed of ... capital, registration of the receiver 2B by Contract The message to be displayed on the screen of the receiving device 2B is controlled by the presence or absence of.

In the message display control system S described with reference to FIG. 1, the transmission device 1 transmits the release code information to the reception device 2 using the broadcast wave W in step S3. However, the message display control system S _B, the transmission apparatus 1B has a point to be transmitted to the receiving apparatus 2B a release code information via the communication line N are different.

That is, the first receiving device 2B ₁ adds its own receiver ID1 to the second receiving device 2B and the subsequent receiving device 2B to delete the message, and adds its own receiver ID1 to the transmitting device 1B. (Step S3A). Then, the transmission apparatus 1B transmits the release code to the receiving device 2B ₁ receiver ID1 (step S3B).
The other operations are the same as those described with reference to FIG.
Hereinafter, the transmission device 1B and the reception device 2B according to the second embodiment of the present invention will be described focusing on differences from the transmission device 1 and the reception device 2.

[Configuration of transmitter]
First, with reference to FIG. 12 (refer to FIG. 11 as appropriate), the configuration of the transmission apparatus 1B according to the second embodiment of the present invention will be described.
The transmission apparatus 1B includes a content distribution unit 10, a common information generation unit 11, an individual information generation unit 12B, a release code information request reception unit 12C, a release code information transmission unit 12D, a multiplexing unit 13, and a release code. The generating unit 14, the timing unit 15, the storage unit 16, the communication control unit 17, the release code information receiving unit 18, and the release code verification unit 19 are provided. Since the configuration other than the individual information generating unit 12B, the release code information request receiving unit 12C, and the release code information transmitting unit 12D is the same as that of the transmission apparatus 1 described with reference to FIG. Is omitted.

  The individual information generating unit 12B generates information (individual information) to be individually transmitted to each receiving device 2B. Here, the individual information generating unit 12B includes a message control information transmitting unit 12a. That is, the individual information generation unit 12B is configured by omitting the release code information transmission unit 12b from the individual information generation unit 12 described in FIG. The message control information transmitting unit 12a has the same configuration as that of the transmitting apparatus 1 described in FIG.

  The release code information request receiving means 12C receives a release code information request for requesting release code information as communication data via the communication control means 17. The release code information request receiving unit 12C outputs the received release code information request to the release code information transmitting unit 12D together with the address (IP address or the like) of the receiving device 2B that has transmitted the request. The release code information request includes the receiver ID of the receiving device 2B that has requested the release code information.

The cancellation code information transmission unit 12D transmits the cancellation code information, which is information for deleting the message in the reception device 2B, to the reception device 2B that requested it.
That is, the release code information transmitting unit 12D is notified of the release code information request from the release code information request receiving unit 12C and stored in the storage unit 16 corresponding to the receiver ID included in the request. The code information is transmitted via the communication control means 17 to the receiving device 2B that requested the information.

  By configuring the transmission apparatus 1B as described above, the transmission apparatus 1B can transmit release code information for simple registration in the second and subsequent reception apparatuses 2B to the reception apparatus 2B. it can. Further, the transmission apparatus 1B can delete the message in the reception apparatus 2B by acquiring the release code information from the second and subsequent reception apparatuses 2B.

[Receiver configuration]
Next, with reference to FIG. 13 (refer to FIG. 11 as appropriate), the configuration of the receiving device 2B according to the second embodiment of the present invention will be described.
The receiving device 2B includes a separating unit 20, a content receiving unit 21, a synthesizing unit 22, a common information processing unit 23, an individual information processing unit 24B, a cancellation code information request transmission unit 24C, and a cancellation code information receiving unit 24D. Storage means 25, release code information display means 26, release code information input means 27, release code information transmission means 28, and communication control means 29. Since the configuration other than the individual information processing unit 24B, the cancellation code information request transmission unit 24C, and the cancellation code information reception unit 24D is the same as that of the reception device 2 described with reference to FIG. Is omitted.

  The individual information processing unit 24B receives individual information (individual information) from the receiving device 2B, which is separated and extracted by the separating unit 20. Here, the individual information processing unit 24B includes a message control information receiving unit 24a. That is, the individual information processing unit 24B is configured by omitting the release code information receiving unit 24b from the individual information processing unit 24 described in FIG. The message control information receiving unit 24a has the same configuration as that of the receiving device 2 described with reference to FIG.

The cancellation code information request transmission unit 24C transmits the request to the transmission device 1B when a cancellation code information request is input via an input unit (not shown).
The cancellation code information request transmission unit 24C displays a cancellation code information request screen, and transmits a cancellation code information request to the transmission device 1B when the viewer (contractor) presses a request button or the like. To do.

The release code information receiving unit 24D receives the release code information transmitted from the transmission device 1B via the communication control unit 29. The release code information is information transmitted from the release code information transmission unit 12D (see FIG. 12) of the transmission apparatus 1B, and is information in which the release code, the contractor ID, and the date / time information are associated with the receiver ID. Yes (see FIG. 5).
The release code information receiving unit 24D writes and stores the release code, contractor ID, and date / time information included in the received release code information in the storage unit 25.

By configuring the receiving device 2B as described above, in the case of the receiving device 2B to be set first, the receiving device 2B provides release code information for simply registering with the second and subsequent receiving devices 2B. It can be acquired from the transmission apparatus 1B via the communication line N and displayed. Further, in the case of the second and subsequent receivers 2, the receiver 2 </ b> B can simply register and erase the message simply by inputting the release code information.
This receiving apparatus 2B can be operated by a program (digital broadcast receiving program) for causing a computer to function as each of the above-described means.

[Operation of message display control system]
Next, with reference to FIG. 14, the operation of the message display control system S _B.
The operation of the message display control system S _B is the same as the operation described in essentially 8 to 10. However, in the operation described in FIG. 8, the operations in steps S19, S20, be one that transmits and receives release code information via the broadcast wave W, the message display control system S _B, in place of step S19, S20 The operation is performed at steps S19A, S19B, S19C, and S20A shown in FIG.

In other words, the receiving device 2B ₁ receives the instruction of the viewer (contractor) at an arbitrary timing after the registration of the _first receiving device 2B ₁ by the cancellation code information request transmitting means 24C via the communication line N. The cancellation code information request with its own receiver ID added is transmitted to the transmission device 1B (step S19A).
On the other hand, the transmission apparatus 1B, the release code information request receiving means 12C, through the communication line N, receives the release code information request from the receiving apparatus 2B ₁ (step S19b).

Then, the transmission device 1B reads the release code information corresponding to the receiver ID included in the request for the release code information requested in step S19B from the storage unit 16 by using the release code information transmission unit 12D. N is transmitted to the requested receiving device 2B ₁ via N (step S19C).
Then, the receiving device 2B ₁ receives the release code information transmitted in step S19C via the communication line N by the release code information receiving unit 24D (step S20A).
Through the above operation, the first receiving device 2B ₁ can acquire the release code information used for registration of the _second and subsequent receiving devices 2B ₂ , 2B ₃ ,... Via the communication line N.

DESCRIPTION OF SYMBOLS 1 Transmission apparatus 10 Content delivery means 11 Common information generation means 11a Message text information transmission means 12 Individual information generation means 12a Message control information transmission means 12b Release code information transmission means 13 Multiplexing means 14 Release code generation means 15 Timekeeping means 16 Storage means 17 Communication control means 18 Cancellation code information reception means 19 Cancellation code verification means 19a Code value verification means 19b Cancellation number verification means 19c Expiration date verification means 2 Receiving device 20 Separation means 21 Content reception means 22 Composition means 23 Common information processing means 23a Message Text information receiving means 24 Individual information processing means 24a Message control information receiving means 24b Release code information receiving means 25 Storage means 26 Release code information display means 27 Release code information input means 28 Release code information Information transmitting means 29 communication control unit

Claims (6)

In a transmission device that multiplexes and transmits a content, a message to be displayed in combination with the content, and message control information indicating whether or not to display the message depending on the presence or absence of registration as a broadcast stream,
Cancellation code generation means for generating a cancellation code unique to the contractor for erasing the display of the message from an identifier unique to the contractor input as registration information of the contractor;
The release code information including the release code generated by the release code generation means and the identifier unique to the contractor is transmitted to the receiving device specified by the identifier unique to the receiving device input as the registered information of the contractor. Cancellation code information transmission means;
Release code information receiving means for receiving the release code information from the unregistered receiving device of the contractor;
Release code for verifying whether the release code received by the release code information receiving means matches the release code generated by the release code generation means or not is valid. Verification means;
When the release code verification means verifies that the release code is valid, it generates message control information indicating that the display of the message is to be deleted, and sends it to the unregistered receiving device that has sent the release code Message control information transmitting means for
A transmission device comprising: Storage means for storing the identifier unique to the contractor and the number of receiving devices from which the display of the message is erased in association with each other;
The release code verification means further corresponds to the identifier unique to the contractor, when the number of receiving devices that have deleted the display of the message stored in the storage means has reached a predetermined maximum number, The transmission apparatus according to claim 1, wherein the release code is determined to be invalid.   The release code verifying unit is further configured such that when an elapsed time from the time when the release code is generated to the time when the release code information is received by the release code information receiving unit has passed a predetermined valid period, 3. The transmission apparatus according to claim 1, wherein the received release code is determined to be invalid. A broadcast stream in which content, a message to be displayed in combination with the content, and message control information indicating whether or not to display the message is multiplexed is received, and the message is received based on the message control information. In a receiving apparatus comprising message text information receiving means for controlling whether or not to output to the combining means for combining with the content,
A release code information receiving means for receiving release code information including a release code for deleting the display of the message generated from the identifier unique to the contractor from the transmission device, and the identifier unique to the contractor;
Cancellation code information display means for displaying the cancellation code information received by the cancellation code information receiving means;
Cancellation code information input means for inputting the cancellation code information displayed on another receiving device registered by the contractor;
Cancellation code information transmitting means for transmitting the cancellation code information input by the cancellation code information input means to the transmission device, and
When the message text information receiving means receives message control information indicating that the display of the message is to be deleted, transmitted as a result of verifying that the release code information is valid from the transmitting device, the message text information receiving means A receiving apparatus that stops output to the combining means. Storage means for storing the release code information received by the release code information receiving means,
5. The receiving apparatus according to claim 4, wherein the release code information display unit reads and displays the release code information from the storage unit when instructed from outside.   The release code information input unit stores the release code information in the storage unit when the release code information displayed on another receiving device registered by the contractor is input. Item 6. The receiving device according to Item 5.

Images