JP5529819B2 - Receiving device, receiving device control method, and receiving device control program - Google Patents

Description

The present invention relates to a receiving apparatus, a receiving apparatus control method, and a receiving apparatus control program that securely acquire contents distributed securely online or by broadcast.

  With the spread of the Internet and the like and the start of digital broadcasting, there are increasing opportunities to obtain paid content with devices held by viewers. Furthermore, a mechanism has been proposed in which only a specific viewer can view the content.

  For example, a broadcast station broadcasts encrypted content and its decryption key (encrypted so that it can be decrypted with a private key owned by a specific viewer), and the viewer decrypts the content decryption key with its own private key. There is a technique in which content is decrypted and content is decrypted with the obtained decryption key (for example, Patent Document 1).

  Also, for example, a broadcast station encrypts a time code that defines an expiration date based on the delivery time, a data key, and a code indicating an algorithm with the viewer's public key, and adds an identification handle to the viewer and transmits it to the viewer The viewer searches for the private key using the handle received by the viewer, decrypts the distribution time, data key, and algorithm using the obtained private key, and creates the decryption key using the algorithm to decrypt the content. There is a technology to make it. With this technique, content can be decrypted only during the expiration date determined by the time code (for example, Patent Document 2).

JP H11-1112950 A JP 2004-48687 A

  In the techniques of Patent Documents 1 and 2, information related to a decryption key for decrypting encrypted content is distributed by broadcasting in the same manner as the content, and is encrypted so that it can be decrypted with the viewer's private key. To be delivered. Therefore, it is possible for a person other than the viewer who desires the content to obtain the information related to the encrypted content and the decryption key. In addition, if the owner's secret key is known, the content can be acquired. In other words, if a malicious person steals the viewer's device, the content can be easily obtained.

  Also, broadcast stations need to be encrypted according to the viewers to be distributed, and this method is not suitable for broadcast distribution that can be distributed to an unspecified number. If the viewer has a common key, the security related to distribution is very low.

  In Patent Document 2, the content cannot be decrypted unless the reception time at the viewer's device is within the expiration date. Since the expiration date is based on the distribution time, the viewer's device needs to be synchronized with the broadcasting station.

  In addition, the viewer's device receives the data necessary for generating the decryption key by broadcasting and creates it in the device, which is more secure than the case where the decryption key itself is distributed. Since it is distributed by broadcasting and has only one acquisition path as viewed from the viewer, it is easy for a person other than the viewer to obtain.

The present invention has been made in view of the above problems, and a receiving apparatus, a receiving apparatus control method, and a receiving apparatus control capable of securely acquiring content provided to an unspecified number of viewers online or broadcast by a distribution station Provide a program.

In order to solve the above-mentioned problem, the present invention provides a method according to claim 1, comprising: managing means for managing a plurality of pieces of key information in which periods that can be used for generating encryption keys do not overlap each other; Distribution time information that can specify content encrypted using a key for encryption generated by a predetermined key generation method using key information that can be used at the time of distribution and the distribution time of the content And content information receiving means for receiving content information transmitted by one-way communication from a distribution station device that distributes content information including the value information that can identify the value of the encrypted content, and the received content A means for storing information in a storage means, a content information acquisition means for acquiring content information including content to be decrypted from the storage means, and From the information storage medium for storing the plurality of key information that is provided with the electronic value information was available for the generation of keys for encryption at a time indicated delivery time information included in the content information to be the acquired Based on key information reading means for reading key information and electronic value information stored in the information storage medium, payment by electronic value of a value specified by value information included in content information including the content to be decrypted is possible is determined to be, and the by the key information reading means, only when it was possible to read the key information available, using the read key information for decryption by the predetermined key generation method Content decrypting means for generating a key and decrypting the encrypted content included in the acquired content information using the decryption key; To provide a receiving apparatus for Bei.
In the invention according to claim 2, the content information is distributed from the distribution station device in a distribution time zone of an unencrypted program related to the encrypted content and distributed from the distribution station device. The receiving apparatus according to claim 1, further comprising means for receiving data of the program transmitted from the distribution station apparatus by one-way communication and causing the reproducing means to reproduce the program in real time.
According to a third aspect of the present invention, the value information is the fee-based encrypted data that is superimposed on data of the program in a distribution time zone of the program that can be viewed free of charge or distributed through a channel different from the program. it is possible to specify the value of the content was to provide a receiving apparatus according to claim 2.
In the invention according to claim 4, the content information further includes free unencrypted content corresponding to a part of the encrypted paid content, and the reproduction means further includes at least the encrypted The receiving apparatus according to claim 3, wherein the unencrypted free content can be reproduced before the paid content is decrypted.
According to a fifth aspect of the present invention, the information storage medium includes a key information that can be used at the time of writing processing and a usable period of the plurality of key information managed by the management means. or multiple sets of key information that includes a plurality of key information written by the updating means having a function of writing in the information storage medium, stores a set of the plurality of key information, any of claims 1 to 4 A receiving device according to claim 1 is provided.
According to a sixth aspect of the present invention, the information storage medium is an IC module having a function of limiting data writing to a storage area and reading data from the storage area to a predetermined device. Item 6. A receiving device according to any one of Items 5 is provided.
The invention according to claim 7 provides the receiving apparatus according to any one of claims 1 to 6, further comprising the information storage medium.
In the invention described in claim 8, the key information usable at the time of distribution provided from the management means for managing a plurality of key information that are consecutive without overlapping each other in the generation period of the encryption key is obtained. It is possible to specify the content encrypted using the key for encryption generated by a predetermined key generation method, the distribution timing information that can specify the distribution timing of the content, and the value of the encrypted content Processing for storing the received content information in a storage means in a receiving device that receives content information transmitted by one-way communication from a distribution station device that distributes content information including various value information, and content to be decrypted a content information acquisition processing for acquiring content information from said storage means including, a plurality of key information and electronic value information provided by the management means serial From the information storage medium, and the key information reading process of reading the key information that were available to generate the key for encryption at a time indicated delivery time information included in the content information to be the acquired, in the information storage medium Based on the stored electronic value information, it is determined that payment by the electronic value of the value specified by the value information included in the content information including the content to be decrypted is possible and used by the key information reading unit Only when the possible key information can be read, a decryption key is generated by the predetermined key generation method using the read key information, and the encryption included in the acquired content information And a content decrypting process for decrypting the converted content using the decryption key.
According to the ninth aspect of the present invention, the key information usable at the time of distribution provided from the management means for managing a plurality of consecutive key information without overlapping each other in the period that can be used for generating the encryption key is obtained. It is possible to specify the content encrypted using the key for encryption generated by a predetermined key generation method, the distribution timing information that can specify the distribution timing of the content, and the value of the encrypted content A receiving device that receives content information transmitted by one-way communication from a distribution station device that distributes content information including various value information, and a storage unit that stores the received content information, and content to be decrypted a content information acquisition function of acquiring content information from said storage means including, a plurality of key information and electronic value information provided by the management means serial From the information storage medium, and key information reading function for reading the key information that were available to generate the key for encryption at a time indicated delivery time information included in the content information to be the acquired, in the information storage medium Based on the stored electronic value information, it is determined that payment by the electronic value of the value specified by the value information included in the content information including the content to be decrypted is possible and used by the key information reading unit Only when the possible key information can be read, a decryption key is generated by the predetermined key generation method using the read key information, and the encryption included in the acquired content information A receiving apparatus control program is provided that realizes a content decrypting function for decrypting the encrypted content using the decryption key.

According to the receiving apparatus, the receiving apparatus control method, and the receiving apparatus control program of the present invention, it is possible to securely acquire content distributed from a distribution station apparatus by one-way communication.

It is a figure which shows the system for demonstrating the sales and provision method of the content of this invention, and the information transmitted / received in a system. 2 is a block diagram of a receiving device 1. FIG. 2 is a block diagram of a distribution station device 5 and a diagram illustrating a relationship between the distribution station device 5 and the reception device 1. FIG. 2 is a diagram illustrating a relationship between an information storage medium 2 and a receiving device 1. FIG. FIG. 4 is a block diagram of the dedicated device 3 and the settlement center device 4, and a diagram showing the relationship between the dedicated device 3, the settlement center device 4 and the distribution station device 5. It is a flowchart which shows the main sequence of this invention. It is a detailed flowchart of step S2. It is a flowchart which shows the process in which the delivery station apparatus 5 encrypts a content and distributes the content information 14. FIG. It is a data structure of content identification information in program data and content information being distributed. It is a detailed flowchart of step S7. 6 is a diagram illustrating an example of notification by a display unit of the reception device 1. FIG. It is a schematic diagram which shows how the information contained in the content information 14 was used. 7 is a sequence chart showing a flow from transmission of information held in the information storage medium 2 to the settlement center device 4 until sales information reaches the distribution station device 5 and the content provider 6. It is an example of the acquisition information 15. It is an example of sales information A. It is a system diagram for explaining a method for selling / providing content of the present invention, which is different from the first embodiment. It is a block diagram of the receiver 1a. It is a system diagram for explaining a method for selling / providing content of the present invention, which is different from the first embodiment. It is a flowchart which shows the main sequence of this invention different from 1st Embodiment. It is a flowchart which performs the trial viewing and value information confirmation processing. It is a data structure of the content information 14. 6 is a display example by the display unit of the receiving device 1.

First embodiment

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram illustrating a system for explaining a method of selling / providing content according to the present invention, and information transmitted / received in the system.

  1 is a receiving device, 2 is an information storage medium, 3 is a dedicated device, 4 is a settlement center device, 5 is a distribution station device, and 6 is a content provider.

  11 is a private key unique to each receiving device 1 owned by the receiving device 1, 12 is key information sent from a predetermined device, 13 is content, 14 is an encrypted version of the content 13 and identification of the content 13 Content information including information and value information (information indicating the charge of the content 13 or the number of points necessary for acquisition) and distribution date information of the content 13, 15 is identification information and value information of the content 13 acquired by the receiving device 1 , 16 is electronic value information such as usable balance information and point information held by the information storage medium 2, and 17 is a viewer (acquisition of content) transmitted from the dedicated device 3 to the settlement center device 4. Payment / point information, such as information on payment and point acquisition by a person who listens, listens, etc., 18 is a settlement center device There sales information A, 19 of the delivery station 5 to create using the acquired information 15 and the like are the sales information B of the content provider 6 the distribution station apparatus 5 creates with sales information A.

  The receiving device 1 is a device owned by the viewer that receives the content information 14 including the content 13 distributed by the distribution station device 5. As the receiving device 1, a device that receives a broadcast broadcast such as a digital radio or a digital television, or a two-way communication device such as a mobile phone can be considered. In the present embodiment, description will be made mainly using a digital radio receiver as an example.

  The information storage medium 2 is an IC card possessed by a viewer and equipped with an IC module capable of reading and writing information in a contactless manner in the receiving device 1 and the dedicated device 3. In the IC module, electronic value information 16, key information 12, and content acquisition information 15 are held.

  The dedicated device 3 is a device installed in a store or the like, and has a function for reading / writing information from / to the information storage medium 2. Further, it has a function of transmitting the payment / point information 17 and the content acquisition information 15 read from the information storage medium 2 to the settlement center device 4 or the like.

  The settlement center device 4 is a device installed in the settlement center. The payment center device 4 is a device that acquires and manages the payment / point information 17 transmitted by the dedicated device 3 and the content acquisition information 15 held in the information storage medium 2 and performs a payment process.

  The distribution station device 5 is a device installed in the distribution station and has a function of distributing content 13. The distribution station device 5 may be a digital radio station or digital television station device that broadcasts the content 13 or a content distribution business device device that distributes the content 13 using the Internet. In the present embodiment, a description will be given mainly using an apparatus installed in a digital radio broadcasting station as an example.

  The content provider 6 is a device of a supplier that actually provides the content 13 to the distribution station device 5. This includes record companies, publishers, and program production companies.

  The receiving device 1 and the dedicated device 3 do not directly transmit / receive information, but transmit / receive information via the information storage medium 2. The dedicated device 3, the settlement center device 4, the distribution station device 5, and the content provider 6 can be interconnected because each has a transmission / reception unit for enabling transmission / reception of information using a communication network. . However, since the information to be transmitted / received is key information or sales information, secure communication is performed by using a dedicated line or using PKI (Public Key Infrastructure).

  Next, each device and the relationship between the devices will be described with reference to FIGS.

  FIG. 2 is a block diagram of the receiving device 1. 101 is a receiving unit that receives the content information 14 including the content 13 distributed by the distribution station device 5, 102 is an audio output unit that outputs the content 13 included in the content information 14 received by the receiving unit 101, and 103 is A clock, 104 is a reader / writer for reading / writing information from / to the information storage medium 2, 105 is a display unit for displaying various types of information (including contents), and 106 is a content 13 received and acquired by the reception unit 101. , A content storage unit 107, a read-only memory (hereinafter referred to as a ROM) in which a program for operating the receiving apparatus 1 and setting information are stored, and a random number 108 that is mainly used for a processing work area Access memory (hereinafter referred to as RAM), 109 is a receiver key 11 that the receiver 1 has uniquely Receiving device key storage unit 110, an input unit 110 for receiving viewer input operations such as buttons and a touch panel, and 111, each component of the receiving device 1 by actually executing an operation program stored in the ROM 107 It is a control part which operates.

  The receiving unit 101 and the audio output unit 102 will be described later together with the distribution station device 5 with reference to FIG.

  The clock 103 is synchronized with the clock 509 of the distribution station device 5. This time synchronization can be achieved by adding time information to the content information 14 distributed from the distribution station device 5 and adjusting the time of the clock 103 to this time information. However, the time synchronization method is not limited to this method.

  The reader / writer 104 writes the electronic value information 16 after acquiring the content 13 to the information storage medium 2, writes the acquisition information 15 to the information storage medium 2, and decrypts the content 13 from the information storage medium 2. It is used when reading out the key information 12 used for. The reader / writer 104 will also be described later with reference to FIG.

  The content storage unit 106 is a storage device that stores the content 13 after acquiring the content 13 using the electronic value information 16 of the information storage medium 2. The content 13 stored here is stored in an encrypted state using the receiving device key 11 stored in the receiving device key storage unit 109 in order to prohibit illegal copying to other devices.

  The receiving device key 11 stored in the receiving device key storage unit 109 is a secret key unique to each receiving device 1 stored at the time of manufacturing the receiving device 1 or at some timing, and encrypts the acquired content 13. Is used when the content is stored in the content storage unit 106. The receiving device key storage unit 109 also stores a public key 11 ′ that is paired with the secret key 11, and these keys can be read out other than the encryption for the content 13 and the decryption for reproduction. It is a mechanism that can not be done. The receiving device key storage unit 109 has a tamper-resistant structure in terms of hardware, and has a mechanism for preventing unauthorized use of the secret key and the public key.

  The ROM 107 has an operation program for actually executing various functions in addition to the content information receiving means, electronic value writing means, acquisition information writing means, content decryption means, and key information acquisition means of the present invention. Stored. Specific functions of these means will be described in detail when the actual operation of the present embodiment is described.

  FIG. 3 is a block diagram of the distribution station device 5 and a diagram showing a relationship between the distribution station device 5 and the reception device 1. 501 is a distribution content storage unit for storing the content 13 distributed by the distribution station device 5, 502 is an input unit for operating the distribution station device 5 and inputting information, 503 is a display unit for displaying various information, 504 Is a content information distribution unit that distributes the content information 14, 505 is a transmission / reception unit for transmitting / receiving information to / from an external device, and 506 is a program or setting information for operating the distribution station device 5. ROM, 507 is a RAM mainly used for the processing work area, 508 is a key information storage unit for storing key information 12 used when encrypting the content 13 to be distributed, 509 is a clock, and 510 is stored in the ROM 506. It is a control unit that actually executes the operation program and operates each component of the distribution station device 5.

  The content 13 stored in the distribution content storage unit 501 is mainly obtained from the content provider 6. The distribution content storage unit 501 actually stores the content 13, identification information for identifying the content 13, and value information of the content 13 in association with each other. As a method of acquiring the content 13 from the content provider 6, there are a method of acquiring offline using a compact disc or the like, a method of acquiring online via the transmission / reception unit 505, and the like, but any method may be used.

  The content information distribution unit 504 distributes the created content information 14. In the present embodiment, since the distribution station is assumed to be a digital radio station, the content information distribution unit 504 broadcasts and distributes the digitally modulated content information 14 using radio waves in a predetermined frequency band. If the distribution station is a digital television station or a content distribution company that distributes content using the Internet, the content information 14 is distributed by a method corresponding to each. The distributed content information 14 is received by the receiving unit 101 of the receiving device 1.

  The transmission / reception unit 505 is means for establishing a network connection with an external device. Accordingly, the distribution station device 5 can communicate with, for example, the settlement center device 4, the content provider 6, and a predetermined device that creates the key information 12.

  The key information 12 stored in the key information storage unit 508 is information that is created by a predetermined device and transmitted to the distribution station device 5 and the dedicated device 3 (the information storage medium 2 via). The key information 12 will be described in detail when explaining the settlement center device 4. The mechanism for encrypting and decrypting the content 13 will be described in detail when the actual operation of the present embodiment is described.

  The clock 509 is synchronized with the clock 103 of the receiving device 1. This time synchronization is as described in the description of the timepiece 103. For example, the timepiece 103 is set to the time of the timepiece 509. Note that the clock 509 keeps accurate time by receiving time distribution from a reliable time distribution station outside.

  The ROM 506 stores an operation program for actually performing various functions in addition to the content encryption unit, the content information creation unit, and the content information distribution unit of the present invention. Specific functions of these means will be described in detail when the actual operation of the present embodiment is described.

  The receiving unit 101 of the receiving device 1 is connected to the antenna 1011 that receives the content information 14 distributed from the distribution station device 5 and the tuner 1013 via the RF unit 1012, and further to the tuner 1013, the received content information 14 is received. A decoder 1014 for demodulating digital modulation is connected.

  When the information distributed from the distribution station device 5 is not paid content information 14 but, for example, free radio program information, the information demodulated by the decoder 1014 is sent to the audio output unit 102 for audio output. The decoder 1014 also has a function of separating and extracting the content information 14 and content identification information from the demodulated information, and the extracted information is sent to the control unit 111.

  The audio output unit 102 of the receiving device 1 actually converts the information sent from the decoder 1014 into an analog signal, a D / A converter 1023, an amplifier 1024 that amplifies the information that has become an analog signal, and the amplified analog signal. It is comprised from the speaker output as an audio | voice. The audio output unit 102 also performs audio output of the acquired content stored in the content storage unit 106.

  FIG. 4 is a diagram illustrating the relationship between the information storage medium 2 and the receiving device 1. The information storage medium 2 in the present embodiment is a non-contact IC card, and an antenna unit 201 that is a communication unit for allowing the reception device 1 and the dedicated device 3 to read and write information in the information storage medium 2; The configuration includes an IC module 202 in which various types of information are held.

  The IC module 202 stores, as storage areas, an electronic value storage area for storing electronic value information 16 such as usable balance information and point information, a key information storage area for storing key information 12, and content acquisition information 15. And an acquisition information storage area to be stored. Apart from these, it also holds operating information that defines access conditions such as conditions for restricting devices that can read and write to the respective storage areas, and conditions for restricting information transmission / reception destinations.

  The information storage medium 2 in the present embodiment reads and writes internal information by receiving electromagnetic power from an external device by the antenna unit 201. The reader / writer 104 of the receiving apparatus 1 modulates the antenna unit 1041 for transmitting and receiving information and supplying power to the antenna unit 201 of the information storage medium 2 and the information to be written in the information storage medium 2 to be transmitted by radio waves. A modulation circuit 1042, a demodulation circuit that demodulates modulated information received by the antenna unit 1041, and an interface 1044 that transmits and receives information between the control unit 111 and the reader / writer 104 are provided.

  FIG. 5 is a block diagram of the dedicated device 3 and the settlement center device 4 and a diagram showing the relationship between the dedicated device 3, the settlement center device 4 and the distribution station device 5.

  First, the dedicated device 3 will be described. 301 is a transmission / reception unit for transmitting / receiving information to / from an external device, 302 is a clock, 303 is an input unit including buttons and keys for inputting various types of information, and 304 is a display for displaying various types of information. 305, a reader / writer, 306, a ROM for storing programs and setting information for operating the dedicated device 3, 307, a RAM mainly used for a processing work area, and 308 for viewing the information storage medium 2. A deposit / point information storage unit 309 for storing information related to deposit when a person has made a deposit, information on point acquisition, etc. (deposit / point information 17), 309 is the content read from the information storage medium 2 by the reader / writer 305 An acquisition information storage unit 310 that stores the acquisition information 15 is an external device such as a POS system (point of sales system). Beam, the interface that can be used to connect to such point of sale), 311 is a control unit for operating the respective components of the dedicated device 3 actually executes the operation program stored in the ROM 306.

  The dedicated device 3 can transmit / receive information to / from the settlement center device 4, a predetermined device that creates the key information 12, a device that desires the acquisition information 15, and the like via the transmission / reception unit 301. In addition, as an apparatus which desires the acquisition information 15, the provider actually related to the content of the acquisition information 15, such as the distribution station apparatus 5 and the content provider 6 that supplies the content to the distribution station apparatus 5, is assumed. it can.

  The configuration of the reader / writer 305 is basically the same as that of the reader / writer 104 of the receiving apparatus 1 described with reference to FIG.

  Since the information stored in the deposit / point information storage unit 308 and the acquired information storage unit 309 is information related to the settlement of the content, unless it is an operation related to transmission / reception of information with the information storage medium 2, Basically, it is a mechanism that cannot read and write information. In addition, it has a structure with tamper resistance and a mechanism for preventing unauthorized use. The information stored in these storage units is periodically transmitted to the settlement center device 4 (or a device that desires the acquisition information 15) via the transmission / reception unit 301.

  By the way, the deposit / point information 17 may be purely information related to deposit or information of point acquisition. For example, the deposit / point is given as the value of the electronic value information 16 before and after depositing the information storage medium 2. Information indicating information indirectly may be used.

  The interface 310 enables connection with a POS system terminal in the same store, for example. As a result, the dedicated device 3 can operate in conjunction with the sales information of the store in the terminal of the POS system.

  The ROM 306 stores an operation program for actually performing various functions, in addition to the information reading means, information sending means, information acquisition means, and information writing means of the present invention. The specific functions of these means will be described in detail when the actual operation of the present embodiment is described.

  Next, the settlement center apparatus 4 will be described. In the present embodiment, description will be made assuming that the key information 12 is created in the settlement center device 4 and is transmitted to the distribution station device 5 and the dedicated device 3 (the information storage medium 2 via). That is, the predetermined device will be described as the settlement center device 4.

  401 is a payment information storage unit for storing the deposit / point information 17 and content acquisition information 15 transmitted from the dedicated device 3, 402 is a clock, 403 is a transmission / reception for transmitting / receiving information to / from an external device 405 is a ROM storing programs and setting information for operating the settlement center device 5, 406 is a RAM mainly used for the processing work area, 407 is a storage unit for storing the key information 12, and 408 is various An input unit including buttons and keys for inputting information, 409 is a display unit for displaying various types of information, and 410 is a configuration for actually executing an operation program stored in the ROM 405 to configure each component of the settlement center device 4 A control unit that operates the element.

  The settlement center device 4 can transmit / receive information to / from the dedicated device 3, the distribution station device 5, and the like via the transmission / reception unit 403.

  Further, the settlement center device 4 creates the sales information A of the content 13 of the distribution station device 5 based on the deposit / point information 17 and the content acquisition information 15 stored in the settlement information storage unit 401, and the distribution station device 5. Send to. Sales information A will be described again when FIG. 16 is described.

  The key information storage unit 407 is a storage device for safely storing the created key information 12.

  By the way, the settlement center device 4 creates key information (changed every predetermined period) in order to securely perform the content distribution from the distribution station device 5 and the content acquisition in the reception device 1, and the distribution station device 5 Is sending to. The key information storage unit 407 is a storage device for safely storing the created key information 12.

  By the way, the settlement center device 4 creates key information 12 that is changed every predetermined period in order to securely perform content distribution from the distribution station device 5 and content acquisition at the reception device 1, and sends the key information 12 to the distribution station device 5. Sending. The key information 12 is transmitted to the dedicated device 3 when it becomes necessary to write the key information 12 to the information storage medium 2 or when a key information transmission request is received from the dedicated device 3. The key information 12 is created by executing an operation program stored in the ROM 405. The distribution station device 5 and the reception device 1 create the same common key using the same key generation algorithm using the information including the key information 12, the content identification information, and the distribution date and time information. Encrypt and decrypt content. Details of key generation, encryption, and decryption will be described in detail when the actual operation of the present embodiment is described.

  As the predetermined period, which is the effective period of the key information 12, for example, one week starting from Monday every week, one month starting from the first day of every month, and the like can be considered. It is possible to provide only one key information 12 to the information storage medium 2 via the dedicated device 3, but in this case, the viewer who is the owner of the information storage medium 2 incorrectly sets the expiration date. If it is forgotten, the receiving apparatus 1 cannot acquire the content 13. Further, when the key information 12 having a predetermined period of one week is held in the information storage medium 2 on Sunday, the valid period of the key information 12 expires on the next day, and the content 13 cannot be acquired. On the other hand, extending the predetermined period of the key information 12 in consideration of the usability of the viewer generally means that the encryption applied to the content 13 is easily deciphered. Therefore, in the present embodiment, in consideration of these problems, a mechanism is adopted in which a plurality of key information 12 in which the start date of the predetermined period of the key information 12 is shifted is provided to the information storage medium 2. As a result, regarding the encryption and decryption of the content 13, it is possible to set a long period of time during which the content 13 can be obtained apparently while maintaining high security.

  Note that the predetermined device is not limited to the settlement center device 4 as long as it is a device that can safely generate the key information 12 and the key information 12 to the distribution station device 5 and the dedicated device 3. Good. For example, if there is a store management device that comprehensively manages the dedicated device 3 installed in various stores, the store management device or the distribution station device 5 itself may be used. . In general, the dedicated device 3 installed in the store and the store management device are a very secure communication system, so the key information 12 is transmitted from the store management device to the information storage medium 2 via the dedicated device 3. When doing so, it is considered that secure communication can be performed. Further, since it is the distribution station apparatus 5 that encrypts the content, it is considered that the distribution station apparatus 5 creating the key information 12 is excellent in smoothly operating the method of the present invention.

  Next, the actual operation of the present invention will be described with reference to FIGS.

  FIG. 6 is a flowchart showing the main sequence of the present invention. The information storage medium 2 acquires and holds necessary information and sends information to be sent. The receiving device 1 receives the content information 14 and acquires the content 13 included therein.

  First, the information storage medium 2 stores and holds the deposit / point information 17 related to the information deposited by the viewer and the point acquisition information by the dedicated device 3. Specifically, electronic value information obtained by adding the electronic value information held by the information storage medium 2 and the deposit / point information 17 is held in the electronic value storage area as usable electronic value information 16. (S1). The dedicated device 3 writes the electronic value information using the reader / writer 305 by the function of the information writing means.

  Next, the information storage medium 2 acquires the key information 12 created by a predetermined device via the dedicated device 3 and holds it in the key information storage area (S2). The dedicated device 3 acquires the key information 12 using the transmission / reception unit 301 by the function of the information acquisition unit, and writes the key information 12 using the reader / writer 305 by the function of the information writing unit. Details will be described later with reference to FIG.

  Next, the information storage medium 2 sends the acquisition information 15 of the content 13 held in the acquisition information storage area to the dedicated device 3 (S3). The dedicated device 3 reads the acquired information 15 using the reader / writer 305 by the function of the information reading means. Then, the acquired information 15 is stored in the acquired information storage unit 309 and is periodically transmitted to the settlement center device 4 or the like using the transmission / reception unit 301 by the function of the information sending means. The transmission destination is determined with reference to the operating information of the information storage medium 2.

  Next, the content information 14 is received by the receiving device 1. Here, a method of acquiring the content 13 of the music flowing in the free program will be described by taking digital radio broadcasting as an example.

  The music flowing in the program is digital data because it is a digital radio broadcast. For example, as shown in FIG. 9A, the identification information of the music content 13 is embedded in the gaps of the music digital data. It shall be.

  The receiving apparatus 1 first receives the program by the receiving unit 101 (S4) and reproduces it by the audio output unit 102. At this time, the content identification information embedded in the music digital data is extracted by the decoder 1014 of the receiving unit 101.

  When the viewer desires to acquire the music content 13 flowing in the program, the viewer operates the input unit 110. Upon receiving this operation signal, the receiving apparatus 1 recognizes the content identification information extracted in S4 as the desired content identification information, and temporarily stores it (S5).

  Next, the receiving device 1 receives the content information 14 distributed from the distribution station device 5 by the receiving unit 101. The distribution station device 5 transmits the content information 14 superimposed on the digital data of the program, transmits the content information 14 after the music broadcast ends, transmits the content information 14 using a channel different from the program, and the like. Thus, the content information 14 can be transmitted. Based on the identification information of the desired content that is temporarily stored, the receiving device 1 extracts from the received content information 14 that includes the identification information of the desired content and temporarily stores it ( S6). S5 and S6 are performed by the function of the content information receiving means.

  Next, the encrypted content included in the content information 14 is actually acquired and stored (S7). Details of this processing will be described later.

  After acquiring the content 13, the status of various information currently held by the information storage medium 2 used for acquiring the content 13 is confirmed (S8). When there is no remaining value of the electronic value information 16 of the information storage medium 2 (the balance is zero and the remaining point is zero), a notification is made to prompt the viewer to move to the electronic value information acquisition step (S1). When the electronic value information 16 has a residual value but the predetermined period of the key information 12 has expired, a notification is made to prompt the viewer to move to the key information 12 acquisition step (S2). Notification is performed using the display unit 105, for example. If the electronic value information 16 has a residual value and the key information 12 has not expired for a predetermined period, the process returns to the step (S4) of receiving the broadcast program again.

  FIG. 7 is a detailed flowchart of the step (S2) in which the information storage medium 2 holds the key information 12.

  First, the dedicated device 3 transmits a transmission request for the key information 12 to a predetermined device (in this embodiment, the settlement center device 4) in order to hold the key information 12 in the information storage medium 2 (S11). .

  The settlement center device 4 receives this transmission request (S12), reads out a plurality of key information 12 created in advance with different start dates of a predetermined period from the key information storage unit 407 (S13), and the dedicated device 3 (S14).

  The key information 12 is, for example, that the dedicated device 3 requests the key information from the settlement center device 4 on March 25, and the predetermined period is one month starting on the first day of every month. When the key information is considered as one set, in S13, key information valid for one month from March 1, key information valid for one month from April 1, and key information valid for one month from May 1 are obtained. The data is read as a set and transmitted from the settlement center device 4 to the dedicated device 3.

  The dedicated device 3 receives the key information 12 from the settlement center device 4 (S15) and writes it in the key information storage area of the information storage medium 2 (S16). Thereby, the key information 12 is held in the information storage medium 2 (S17).

  FIG. 8 is a flowchart showing a process in which the distribution station device 5 encrypts the content using the key information 12 received from the settlement center device 4 and distributes the content information 14. Incidentally, the distribution station device 5 receives the key information 12 from the settlement center device 4, and creates the same encryption key as the decryption key for the reception device 1 to decrypt the content.

  First, the settlement center device 4 reads the key information 12 created in advance from the key information storage unit 407 (S21) and transmits it to the distribution station device 5 (S22). The settlement center device 4 is assumed to transmit the key information 12 to the distribution station device 5 periodically according to a predetermined period of the key information 12. For example, if the predetermined period is one month starting from the first day of every month, the settlement center device 4 transmits the key information 12 to the distribution station device 5 at the end of every month. The delivery timing is not limited to this.

  The distribution station device 5 receives and acquires the key information 12 transmitted from the settlement center device 4 (S23). Then, it is stored in the key information storage unit 508. This S23 is performed by the function of the key information acquisition means.

  Next, the distribution station device 5 reads the content 13 to be distributed from the distribution content storage unit 501 and its identification information and value information (S24), creates an encryption key for encrypting the content 13 (S25), and the content 13 Is encrypted (S26). S25 and S26 are performed by the function of the content encryption unit.

  The content encryption means first creates an encryption key using a predetermined key generation algorithm. As a key generation algorithm, for example, a character string obtained by combining information including key information 12 stored in the key information storage unit 508, identification information of the content 13 read in S24, and date / time information for distributing the content information 14 In addition, hash data can be generated by applying a hash function. The encryption of the content 13 can be performed using the well-known XOR encryption or DES block encryption based on this key (hash data).

  Since the key information 12 is changed in a predetermined period and the date and time information changes every moment, even if the same content 13 has different distribution date and time, the key information used for key generation changes. In addition, since a hash function is used for key generation, it is impossible to reversely calculate the key information being used. Therefore, the most important key information 12 can be protected from the encrypted content. Therefore, encryption with very high security can be performed on the content 13.

  In the present embodiment, the identification information of the content 13, the date and time information to be distributed, and the key information are used for key generation. However, the present invention is not limited to these. For example, in the case of a radio, the program broadcast date may be used instead of the distribution date. Further, some of the above three types may be extracted, or another information may be added.

  Next, the distribution station device 5 creates the content information 14 including the encrypted content, the identification information of the content 13, the distribution date information, and the value information of the content 13 (S27). This is done by the function of the content information creation means. The content information 14 has a data structure including identification information (ID), distribution date / time information (date / time), value information (value) of the content 13, and encrypted content as shown in FIG. 9B. Have. Even when the distribution date / time information is used for encrypting the content 13, if it is clear that the distribution station device 5 and the receiving device 1 are synchronized, the content information 14 does not include the distribution date / time information. You may take the technique of transmitting.

  The distribution station device 5 distributes the content information 14 as shown in FIG. 9B from the content distribution unit 504 (S28). This S28 is performed by the function of the content information distribution means.

  FIG. 10 is a detailed flowchart of the step (S7) showing the purchase and storage of the content 13 in the receiving device 1.

  First, the receiving apparatus 1 reads the electronic value information 16 (residual value information) and the key information 12 from the information storage medium 2 using the reader / writer 104 (S31). Here, since the information storage medium 2 holds a plurality of pieces of key information 12 shifted by a predetermined period, the receiving device 1 reads key information corresponding to the key information read date and time.

  Next, it is confirmed whether or not the read residual value exists (S32). If there is no residual value, the display unit 105 or the like is used to notify that there is no residual value (S42). If there is residual value, the process proceeds to S33.

  In S33, the value information (content value) of the desired content 13 desired to be acquired is subtracted from the remaining value existing in the information storage medium 2, and the result of this subtraction is set as a new remaining value.

  If the residual value is less than zero, it means that the desired content 13 cannot be acquired, and the display unit 105 is used to notify that the residual value is insufficient (S43). An example of this notification is shown in FIG. In this figure, the display unit 105 notifies that the remaining value held by the information storage medium 2 before subtraction is 100 yen and the content is 300 yen, so that 200 yen is insufficient. . If the expiration date (the last date and time of the predetermined period) of the key information 12 is notified as supplementary information, the viewer is urged to go to the store where the dedicated device 3 is located and acquire the key information 12. be able to. If the remaining value is zero or more, the process proceeds to S35.

  In S35, it is confirmed whether or not the reading date and time by the receiving apparatus 1 is within a predetermined period of the key information 12. In S31, the key information 12 corresponding to the reading date / time is already read, but the usable key information 12 is not held in the information storage medium 2 (predetermined key information 12 held is predetermined). If the period has expired), the process proceeds to S44, and the display unit 105 is used to notify that the predetermined period has expired. Note that S35 and S44 may be performed after S31. If the read date / time is within the predetermined period of the key information 12, creation of a decryption key for the content 13 is started (S36).

  The decryption key is created by the content decrypting means in the same manner as the content encrypting means of the distribution station device 5 creates the encryption key. That is, the content decryption means includes the key information 12 acquired from the information storage medium 2, the identification information of the content 13 included in the content information 14 received and temporarily stored, and the delivery date / time information. Using the information, a decryption key is created by applying a predetermined key generation algorithm. Then, the encrypted content included in the received content information 14 is decrypted with this decryption key (S37).

  The decryption key creation method for the receiving device 1 is that information necessary for creating the decryption key is acquired separately from the distribution station device 5 and the settlement center device 4, and the key information 12 which is one of the necessary information is Since the information storage medium 2 is stored separately from the receiving device 1 and the key information and the distribution date and time information, which are necessary information, are changed according to the time and a predetermined period, I can say that.

  For example, when a malicious person steals the receiving device 1, all that can be done is to reproduce the content 13 stored in the receiving device 1. In order to acquire the content 13, both the receiving device 1 and the information storage medium 2 are necessary to acquire all the information necessary for generating the decryption key, and the key information stored in the information storage medium 2 The content 13 cannot be acquired unless it is within 12 predetermined periods. Further, if the electronic value information 16 of the information storage medium 2 is zero residual value, the malicious person cannot acquire the content 13 without depositing it through the dedicated device 3. Further, the receiver 1 and the information storage medium 2 do not store any personal information regarding the viewer.

  For example, even if a malicious person decrypts the encryption key of content included in certain content information, this key is created for each content information to be distributed based on some information as described above. Therefore, it is impossible to decrypt the content included in the other content information with the decrypted key. Further, as described in the explanation of the content encryption unit of the distribution station device 5, the key information 12 is protected by the key generation algorithm using the hash function, and therefore is included in another content information. It is impossible to create a decryption key for content.

  Therefore, the viewer can acquire the content 13 extremely safely. Even if the information storage medium 2 and the receiving device 1 are stolen, damage can be kept to a minimum.

  Returning to the flowchart, the receiving apparatus 1 next re-encrypts the content 13 obtained by decrypting in S37 with the private key unique to the receiving apparatus stored in the receiving apparatus key storage unit 109 (S38). The converted content is stored in the content storage unit 106 (S39).

  As a result, the content 13 is acquired in the receiving device 1, and the receiving device 1 acquires the acquired identification information and value information of the content 13 in the electronic value storage area using the residual value calculated in S 33 as the electronic value information 16. The information 15 is written in the acquired information storage area (S40), and the content 13 is officially purchased and acquired. Then, the display unit 105 is used to notify the end of a series of processes indicating purchase and storage of the content 13 (S41), and this flow is ended. An example of notification in S41 is shown in FIG. The display unit 105 shown in this figure is not a musical piece content, but purchases pictorial book contents (with text, images, and audio) of XX stag beetle with points, remaining points, remaining money (remaining value), and key information 12 expiration dates (the last date and time of a predetermined period) are notified. In the present invention, the content 13 is not limited to music, but may be text, an image, a video, or a composite thereof as shown in this figure.

  In this flow, the residual value is obtained by subtracting the value information of the content 13 from the electronic value information of the information storage medium 2, and the electronic value information 16 (residual value) is added to the information storage medium 2 as the content 13 is acquired. The writing process is a function performed by the electronic value writing means. The process of writing the acquisition information 15 of the content 13 into the information storage medium 2 is a function performed by the acquisition information writing means. The process of reading the appropriate key information 12 in consideration of the predetermined period is a function performed by the key information reading unit.

  FIG. 12 is a schematic diagram showing how the information included in the content information 14 is used in the steps indicating the purchase and storage of the content 13 in the receiving device 1 of FIG.

  The identification information (ID) and the distribution date / time information (date / time) are used to create a decryption key for decrypting the encryption of the content 13 (21). The value information (value) is used for calculating the residual value (22). Then, acquisition information 15 such as identification information (ID), distribution date / time information (date / time), and value information (value) and electronic value information 16 as residual value are written and held in the information storage medium 2 (23). On the other hand, the encrypted content is decrypted with the decryption key (24), encrypted with the receiving device key (25), and stored in the content storage unit 106 (26).

  Next, FIG. 13 is a sequence chart showing a flow until information held in the information storage medium 2 is transmitted to the settlement center device 4 via the dedicated device 3 and sales information reaches the distribution station device 5 and the content provider 6. It is. Although not shown in this chart, payment / point information 17 such as information on payment by the viewer and point acquisition is periodically transmitted from the dedicated device 3 to the settlement center device 4. Accordingly, the sales proceeds of the content 13 are always collected by the settlement center device 4.

  The dedicated device 3 first reads and acquires the acquisition information 15 from the acquisition information storage area of the information storage medium 2 by the reader / writer 305 by the function of the information reading means (S51). The dedicated device 3 reads the acquired information 15 when holding the deposit / point information 17 in the information storage medium 2 or when holding the key information 12, so the residual value of the electronic value information 16 of the information storage medium 2 disappears. The acquisition information 15 can always be obtained at the timing when the predetermined period of the key information 12 expires.

  Next, the dedicated device 3 transmits the acquired information 15 from the transmission / reception unit 301 to the settlement center device 4 by the function of the information transmission means (S52). This is received by the transmission / reception unit 403 of the settlement center device 4 (S53). After transmitting the acquisition information 15, the dedicated device 3 performs a writing process for erasing the acquisition information 15 in the information storage medium 2 by the reader / writer 305 by the function of the information writing means (S 63). Thereby, the acquisition information 15 previously transmitted to the settlement center device 4 is deleted from the acquisition information storage area of the information storage medium 2 (S64).

  Here, an example of the acquisition information 15 transmitted from the information storage medium 2 to the settlement center device 4 via the dedicated device 3 is shown in FIG. In FIG. 14, as the acquired information 15, the distribution station (27) of the content 13, the distribution date and time (28) of the content 13, the identification information (29) of the content 13, and its value information (fee (30) or point (31)) And are included.

  The settlement center device 4 receives the acquired information 15 as shown in FIG. 14 from the dedicated device 3 and then stores it in the settlement information storage unit 401 (S54), and periodically aggregates it to create sales information A (S55). An example of the sales information A is shown in FIG.

  FIG. 15 is an example of sales information for each content 13 for each distribution station in a certain period (here, one month from April 1, 2005 to April 30, 2005). The sales information includes the distribution station (27) of the content 13, the identification information (29) of the content 13, the quantity sold in money during the period (32), the value information (30) that is the unit price, and the money during the period. Items such as the total amount sold (33), the quantity sold by points during the period (34), the value information (31) as the unit price of points, and the total points sold by points during the period (35) are included. By referring to 33 and 35 in FIG. 15, it can be seen how much the content 13 has been purchased and sold during the period. Further, 36 indicates the sales amount for each distribution station for the period, and 37 indicates the sales points.

  The settlement center device 4 transmits the sales information A as shown in FIG. 15 from the transmission / reception unit 403 to the distribution station device 5 for each distribution station (S56). Based on the sales information A, settlement processing is also performed for the distribution station.

  The distribution station device 5 receives the sales information A transmitted from the settlement center device 4 by the transmission / reception unit 505 (S57), and creates the sales information B of the content provider 6 based on the sales information A (S58). Regarding the sales of the content provider 6, for example, there is a calculation method in which a predetermined percentage of the sales of the distribution station is used as the sales of the content provider 6.

  The distribution station device 5 creates the sales information B using the sales information A in accordance with the sales calculation method of the content provider 6 determined in advance, stores the sales information A and the sales information B (S59), The sales information B is transmitted from the transmission / reception unit 505 to the content provider 6 (S60). Then, payment processing based on the sales information B is performed for the content provider 6.

  The content provider 6 receives the sales information B from the distribution station device 5 (S61) and stores it (S62). Then, payment is received from the distribution station device 5. As a result, the information stored in the information storage medium 2 is transmitted to the settlement center device 4 via the dedicated device 3, and the series of processes until the sales information reaches the distribution station device 5 and the content provider 6 is completed. Note that the creation processing, storage processing, and transmission / reception processing of each information is performed by the control unit of each device executing an operation program stored in the ROM.

  As described above, the viewer does not use any personal information to acquire the desired content 13, and the content 13 is acquired by the viewer's receiver 1 in a highly secure and highly secure state, and The sales of the content 13 are surely collected by the distribution station device and the content provider. As described above, the present invention can provide an extremely safe and reliable method for selling and providing content, and a method for paying content.

  Further, the distribution station device can distribute the content without being aware of the presence of the receiving device (without using any information related to the receiving device).

  The receiving device creates a decryption key for the content 13 for each content information 14 and acquires information used for creation from a plurality of routes. These pieces of information are changed according to time and a certain period. With such a mechanism for encrypting and decrypting the content 13, it is possible to achieve extremely secure content acquisition by the receiving device 1.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIGS. 16 and 17.

  FIG. 16 is a system diagram for explaining a method for selling and providing content according to the present invention, which is different from the first embodiment.

  In addition, the code | symbol provided to various information, the apparatuses, and the code | symbol provided to the component shall use the same thing as the case of Embodiment 1 unless there is particular notice, and omit description.

  Reference numeral 1a denotes a receiving device on which the information storage medium 2a is mounted. With such a receiving apparatus, it is not necessary to mount a reader / writer on the receiving apparatus as in the first embodiment.

  FIG. 17 is a block diagram of the receiving device 1a. The difference between the receiving apparatus 1 shown in FIG. 2 in the first embodiment and the receiving apparatus 1 a of this embodiment is that the receiving apparatus 1 a has an information storage medium 2 a instead of the reader / writer 104. The information storage medium 2a includes an antenna unit 112 that transmits / receives information to / from an external device such as the dedicated device 3, and an IC module 113 that holds various types of information. Since the function of the antenna unit 112 and the function of the IC module are the same as those of the antenna unit 201 and the IC module 202 of the information storage medium 2 of Embodiment 1, they are omitted.

  The information storage medium 2a exists in the receiving device 1a, but operates by receiving electromagnetic power from the dedicated device 3 when transmitting / receiving information to / from the dedicated device 3. Also in the receiving device 1 a, the information storage medium 2 a cannot be accessed for purposes other than writing the acquisition information 15 of the content 13, writing the electronic value information 16, and reading the key information 12.

  Since the information storage medium is mounted on the receiving device as described above, it is not necessary to mount a reader / writer on the receiving device, and the number of components that the viewer must own is reduced. It is considered that the usability of the device is improved and the present invention is easily spread.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  FIG. 18 is a system diagram for explaining a method for selling / providing content according to the present invention, which is different from the first embodiment.

  In addition, the code | symbol provided to various information, the apparatuses, and the code | symbol provided to the component shall use the same thing as the case of Embodiment 1 unless there is particular notice, and omit description.

  Reference numeral 7 denotes a predetermined device specialized in security work that creates the key information 12 and provides it to the distribution station device 5 and the dedicated device 3 (via the information storage medium 2 or 2a). In the first embodiment, an example is shown in which the settlement center device 4 (or a store management device that centrally manages the dedicated device 3 installed in various stores, the distribution station device 5 or the like) also serves as this device. However, when the key information 12 is stored and operated more securely, there is a method of setting it as a specialized device separately from the settlement center device 4.

  By doing in this way, it becomes possible to respond very quickly even if there is any trouble regarding the encryption and decryption of the content 13.

Fourth embodiment

  Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 19 is a flowchart showing a main sequence of the present invention, which is different from the first embodiment.

  In addition, the code | symbol provided to various information, the apparatuses, and the code | symbol provided to the component shall use the same thing as the case of Embodiment 1 unless there is particular notice, and omit description.

  In FIG. 19, the step number with a small letter “a” such as S <b> 1 a is the same as the step number in FIG. 6. For example, S1a is the same as S1 in FIG. Therefore, the description of the step number with a lowercase “a” is omitted.

  In the present embodiment, the content information 14 includes trial viewing information of the content 13, and confirmation processing is performed on the trial viewing information and the value information of the content 13, and the acquisition or cancellation of the content 13 is executed in response to the result. To do.

  In FIG. 19, after the content information 14 is received and stored in S6a, trial viewing and value information confirmation processing are performed in S71. This detailed flowchart is shown in FIG.

  First, the receiving device 1 reads the value information and trial viewing information of the content 13 from the temporarily stored content information 14 (S81). The content information 14 has a data structure as shown in FIG. That is, the data structure includes identification information (ID) of the content 13, distribution date information (date), value information (value) of the content 13, trial viewing information (trial viewing), and encrypted content. . Since the trial viewing information (trial viewing) is free, it is not particularly encrypted.

  Next, the receiving apparatus 1 displays the value information on the display unit 105 (S82), and also performs a display for confirming whether the trial viewing is appropriate (S83). An example of this display is shown in FIG. In this figure, the display unit 105 displays value information (charge information and point information) of the content 13 and text for confirming whether or not the trial viewing is appropriate. Since the display screen asks whether or not the trial viewing is desired, information that allows the input of the trial viewing is also assigned to the input unit 110. “Yes”, “No”, “Return”, etc. in the figure correspond to this.

  When the operation signal of the input unit 110 by the viewer is information indicating trial viewing (Yes in FIG. 22), the receiving device 1 performs a reproduction process according to the trial viewing information (S84). For example, in the case of music information, reproduction is performed in the audio output unit 102, and in the case of image or video content, reproduction is performed on the display unit 105. When the operation signal of the input unit 110 by the viewer is information that trial viewing is not performed (No in FIG. 22), the process proceeds to S85.

  In S85, the receiving apparatus 1 performs a display for confirming whether or not to purchase. When the operation signal of the input unit 110 by the viewer is information indicating that the purchase is to be made, this flow is ended and the process proceeds to the “content 13 acquisition and storage routine” (S7a) in FIG. 19 (S86). If the operation signal of the input unit 110 by the viewer is information that the purchase is not made, this flow is ended, and “process for checking the status of various information currently held in the information storage medium 2” in FIG. 19 (S8a) (S87).

  As described above, by including trial viewing information in the content information 14 and enabling the trial viewing by the receiving device 1, it is possible to provide a mechanism that can be purchased after the viewer examines the content 13. This also leads to a reduction in the chances for the viewer to purchase the useless contents 3 by mistake, so that the electronic value information 16 in the information storage medium 2 can be used effectively.

DESCRIPTION OF SYMBOLS 1 Receiving device 2 Information storage medium 3 Dedicated device 4 Settlement center device 5 Distribution station device 6 Content provider 11 Receiving device key 12 Key information 13 Content 14 Content information 15 Acquisition information 16 Electronic value information 17 Deposit / point information 18 Sales information A
19 Sales information B

Claims (9)

Predetermined key generation method using key information that can be used at the time of distribution provided from a management means that manages a plurality of consecutive key information that can be used to generate an encryption key without overlapping each other Content information including content encrypted using the encryption key generated by the above, delivery time information capable of specifying the delivery time of the content, and value information capable of specifying the value of the encrypted content Content information receiving means for receiving content information transmitted by one-way communication from a distribution station device that distributes
Means for storing the received content information in a storage means;
Content information acquisition means for acquiring content information including content to be decrypted from the storage means;
Used to generate a key for encryption at a time indicated by distribution time information included in the acquired content information from an information storage medium storing the plurality of key information and electronic value information provided from the management means Key information reading means for reading key information that was possible;
Based on the electronic value information stored in the information storage medium, it is determined that payment with the electronic value of the value specified by the value information included in the content information including the content to be decrypted is possible, and the key information the reading means, only when it was possible to read the key information available, using the read key information to generate a decryption key by the predetermined key generation method, content that is the acquired Content decrypting means for decrypting the encrypted content included in the information using the decryption key;
A receiving apparatus comprising: The content information is distributed from the distribution station device in a distribution time zone of an unencrypted program distributed from the distribution station device in relation to the encrypted content,
Further comprising means for receiving data of the program transmitted by one-way communication from the distribution station apparatus and causing the reproduction means to reproduce the program in real time;
The receiving device according to claim 1. The value information is, can identify the value of the content the encrypted paid delivered on a different channel than the no cost viewable said superimposed on the distribution time zone of the program data of the program or in the program there, the receiving device according to claim 2. The content information further includes free unencrypted content corresponding to a part of the encrypted paid content,
The playback means can further play the unencrypted free content before decrypting at least the encrypted paid content.
The receiving device according to claim 3. The information storage medium includes key information that can be used at the time of the writing process among a plurality of key information managed by the management unit, and one or a plurality of key information whose usable period is continuous to the key information. Storing a plurality of sets of key information written by an updating means having a function of writing a plurality of sets of key information to the information storage medium;
The receiving device according to any one of claims 1 to 4. The information storage medium, the reading of data from writing and the storage area of the data to the storage area is an IC module having a function of limiting to a predetermined device, to any one of claims 1 to 5 The receiving device described. Wherein the information further comprising a storage medium receiving device according to any one of claims 1 to 6. Predetermined key generation method using key information that can be used at the time of distribution provided from a management means that manages a plurality of consecutive key information that can be used to generate an encryption key without overlapping each other Content information including content encrypted using the encryption key generated by the above, delivery time information capable of specifying the delivery time of the content, and value information capable of specifying the value of the encrypted content To a receiving device that receives content information transmitted by one-way communication from a distribution station device that distributes
A process of storing the received content information in a storage means;
Content information acquisition processing for acquiring content information including content to be decrypted from the storage means;
Used to generate a key for encryption at a time indicated by distribution time information included in the acquired content information from an information storage medium storing the plurality of key information and electronic value information provided from the management means A key information reading process for reading key information that was possible;
Based on the electronic value information stored in the information storage medium, it is determined that payment with the electronic value of the value specified by the value information included in the content information including the content to be decrypted is possible, and the key information the reading means, only when it was possible to read the key information available, using the read key information to generate a decryption key by the predetermined key generation method, content that is the acquired A content decryption process for decrypting the encrypted content included in the information using the decryption key;
A method for controlling the receiving apparatus. Predetermined key generation method using key information that can be used at the time of distribution provided from a management means that manages a plurality of consecutive key information that can be used to generate an encryption key without overlapping each other Content information including content encrypted using the encryption key generated by the above, delivery time information capable of specifying the delivery time of the content, and value information capable of specifying the value of the encrypted content To a receiving device that receives content information transmitted by one-way communication from a distribution station device that distributes
A function of storing the received content information in a storage means;
A content information acquisition function for acquiring content information including content to be decrypted from the storage means;
Used to generate a key for encryption at a time indicated by distribution time information included in the acquired content information from an information storage medium storing the plurality of key information and electronic value information provided from the management means A key information reading function for reading key information that was possible;
Based on the electronic value information stored in the information storage medium, it is determined that payment with the electronic value of the value specified by the value information included in the content information including the content to be decrypted is possible, and the key information the reading means, only when it was possible to read the key information available, using the read key information to generate a decryption key by the predetermined key generation method, content that is the acquired A content decryption function for decrypting encrypted content included in the information using the decryption key;
A control program for the receiving apparatus that realizes

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