JP2006099698A - Distribution information reproduction device, program and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control use of distribution information by time or a place, and to prevent unauthorized secondary use. <P>SOLUTION: When time information previously including verification information is distributed, validity of the time information is verified, and an internal timepiece non-adjustable from the outside is adjusted on the basis of the time information. When position information previously including verification information is distributed, validity of the position information is verified. It is decided whether the time shown by the internal timepiece corresponds to a reproduction deadline (reproduction time information) or not when the time information and the position information have the validity as the result of each the verification, it is decided whether the position information corresponds to reproduction position information or not when the time information and the position information have the validity as the result of each the verification, an encrypted content is decrypted and reproduced by restoration of a reproduction application when corresponding to the reproduction dead line and the reproduction position information as the result of each the decision, and the reproduction application or the like is deleted after completion of the reproduction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a distribution information reproducing apparatus, program, and method for reproducing distribution information such as content distributed in a digitized manner. In particular, the use of distribution information can be controlled according to time and place. Unauthorized secondary use can be prevented.

  Conventionally, when distribution information such as digitized content or a reproduction application for reproduction thereof is distributed, it is difficult to control the use of the distribution information according to time and place.

  Regarding the time, for example, a clock that can be changed by the user in the mobile phone and an internal clock that cannot be changed by the user in the mobile phone are provided, and a method for controlling the reproduction of content by this internal clock is widely known. It has been. Here, the internal clock is controlled by time information distributed from a base station or the like. However, the playback control method using the internal clock cannot determine whether the internal clock is correct. For this reason, by using fake time information simulating the time information to be distributed, the internal clock can be adjusted, and illegal reproduction (secondary use) of the content becomes possible.

  Similarly, in a playback device, when a playback application for content playback is distributed and used, it is stored even after playback of the content. Will be possible.

  On the other hand, regarding the place, the content is not playback controlled. For this reason, content related to copyrights such as movies, for example, is distributed only in a specific area because there is a possibility of being reused even if the image is distributed in a spot for movie advertisement. Despite being, you have to pay enormous copyright fees.

In addition, as a prior art document related to this application, there is one that describes a mechanism of GPS (Global Positioning System: a positioning system using a satellite) (see Non-Patent Document 1). In addition, there is a description of a secret sharing method for distributing and managing secret information (see Non-Patent Documents 2 and 3).
“Current Status and Prospects of GPS”, Journal of the Institute of Electronics, Information and Communication Engineers, December 1992, <http://www.ieice.org/jpn/books/kaishikiji/199912/19991201.html> A. Shamir, “How to share a secret”, Communications of the ACM, 22, 11, pp. 612-613, 1979. J. Benaloh, J. Leichter, “Generalized secret sharing and monotone functions”, Proceedings of CRYPTO '88, pp. 27-35, 1988.

  As described above, when distribution information such as content or a reproduction application thereof is distributed, it is difficult to control the use of the distribution information according to time and place. For this reason, illegal secondary use of distribution information is possible. Along with this, enormous copyrights may be generated.

  The present invention has been made in consideration of the above circumstances, and provides a distribution information reproducing apparatus, program, and method that can control the use of distribution information according to time and place and prevent illegal secondary use of distribution information. With the goal.

  The first invention is a distribution information reproducing apparatus capable of reproducing distribution information distributed including reproduction time information and reproduction position information. When time information including verification information is distributed in advance, the time information Time information verification means for verifying validity based on the verification information, and an internal clock for adjusting an internal clock that cannot be adjusted from the outside based on the time information when the time information is valid as a result of the verification When the positional information including the verification information is distributed in advance, the adjusting means, the positional information verification means for verifying the validity of the positional information based on the verification information, the time information and the position as a result of each verification When the information is valid, reproduction time determination means for determining whether the time indicated by the internal clock corresponds to the reproduction time information, and as a result of each verification, the time information and the position information are valid. The Then, reproduction position determination means for determining whether or not the position information corresponds to the reproduction position information, and when the result of each determination corresponds to the reproduction time information and the reproduction position information, the distribution information is It is a distribution information reproducing device comprising a reproducing means for reproducing and a distribution information deleting means for deleting the distribution information after the reproduction is completed.

(Function)
Therefore, when the time information including the verification information is distributed in advance by taking the above measures, the first invention verifies the validity of the time information, and when the time information is valid, An internal clock that cannot be adjusted from the outside is adjusted based on the time information, and when position information including verification information is distributed in advance, the validity of the position information is verified. As a result of each verification, time information and position When the information is valid, it is determined whether or not the time indicated by the internal clock corresponds to the reproduction time information, and when the time information and the position information are valid as a result of each verification, the position information is the reproduction position. It is determined whether or not it corresponds to the information. When the result of each determination corresponds to the reproduction time information and the reproduction position information, the distribution information is reproduced, and after the reproduction is completed, the distribution information is deleted.

  In this way, the use of distribution information can be controlled by time and place, and illegal secondary use of distribution information can be prevented.

  As described above, according to the present invention, use of distribution information can be controlled by time and place, and illegal secondary use of distribution information can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic diagram showing a configuration of a content reproduction system to which a distribution information reproduction method according to the first embodiment of the present invention is applied. This content reproduction system includes a time distribution station 10, a location information distribution station 20, a mobile phone device 30, and a distribution station 50.

  Here, the time distribution station 10 distributes, for example, time data indicating standard time and time information including verification information to the mobile phone device 30. Here, the verification information indicates that the information has been distributed from a legitimate base station. For example, an error correction code is provided as redundant parity, and a predetermined pattern is embedded as an erasure symbol in the parity portion. Is applicable. This verification information is applied not only to time information but also to position information.

  The position information distribution station 20 distributes the current position information to the mobile phone device 30, and distributes position information distributed to, for example, a mobile phone equipped with a GPS function. Here, the position information includes verification information similar to the time information described above.

  There are several methods for calculating the position. In many cases, 3 to 4 satellites are used, correction data is received from a base station serving as a reference station, and an accurate position is calculated. Since the position of the satellite is determined, the position is calculated from data sent from the satellite and correction data. The correction data is for correcting an error caused by deterioration of data sent from a GPS satellite. Regarding the mechanism of GPS, Non-Patent Document 1 and the like are detailed.

  The mobile phone device 30 is a mobile phone owned by the user, and has a function of verifying time information received from the time information distribution station 10, a function of verifying position information received from the position information distribution station 20, and As a result, when the time information and the position information are correct, based on the function of transmitting the content distribution request to the distribution station 50 and receiving the encapsulation information and the reproduction application from the distribution station 50 and the header information in the encapsulation information, A function for determining whether or not the content can be reproduced, and when the result of the determination indicates that reproduction is possible, the reproduction request information is transmitted to the distribution station 50, and the individualized reproduction application received from the distribution station 50 and the previously received reproduction application With the function to restore the playback application that can play the content and the restored playback application, A function for decrypting the decryption key of the encrypted content from the reproduction key information of the information, a function for decrypting and reproducing the encrypted content in the encapsulated information based on the decryption key, and a reproduction at least restored after the reproduction is finished A function to delete the application and the individualized reproduction application.

  Specifically, the mobile phone device 30 is assumed to be a mobile phone capable of executing a program as a content playback device. Some current mobile phones can reproduce audio, still images, and moving images, and some can execute programs described in JAVA (registered trademark). Furthermore, there is a model in which a chip of an IC card can be mounted and confidential information is stored in the IC chip. In addition, there is a model having a personal identification function using biometric information in order to confirm whether or not it is the owner of the mobile phone. That is, as the mobile phone device 30, a model that can execute a program for realizing the above functions among the current mobile phones is used. This program is installed in advance in the computer of the mobile phone device 30.

  The distribution station 50 distributes digital content to the mobile phone device 30 based on a distribution request from the mobile phone device 30.

  Specifically, the distribution station 50 distributes the encapsulated information including the header information and the encrypted content shown in FIG. 2 and the reproduction application before restoration to the mobile phone device 30 by normal encrypted distribution. And a function of generating an individualized reproduction application based on the reproduction request information received from the mobile phone device 30 and transmitting it to the mobile phone device 30.

  As shown in FIG. 2, the digital content is distributed as encapsulated information in which header information and encrypted content are combined. For this reason, even if only the header information is cut out, the content is encrypted and cannot be used illegally.

  The header information includes information regarding the number of times that the encrypted content can be played, information about the playback deadline, information about the playable area (position), information about the content duplication authority, and decryption for decrypting the encrypted content. Contains information about the key.

  The reproducible number of times is information indicating how many times the distributed content can be reproduced on the mobile phone. The information regarding the reproducible time limit indicates that the distributed content can be reproduced until, for example, August 30, 2004. For example, if there is no information regarding this time limit, it may be possible to play back indefinitely. For example, if the reproducible number of times is 3 and the reproducible time limit is August 30, 2004, the user can replay the distributed content up to three times until the time limit.

  Reproducible position information indicates reproducible position information calculated from GPS information. Position information includes latitude, longitude, and altitude. In addition to this, an area having a radius of km may be added as reproducible position information. For example, it is shown that a movie advertisement distributed near a movie theater can be reproduced within a radius of 2 km from the movie theater. If that range is exceeded, playback will no longer be possible.

  The copy authority information indicates whether the distributed content can be copied and passed to a third party. If the content can be duplicated, the user can copy the distributed content to an external memory and pass it to another person. The person who is handed over can play back only in the number of times, due date, and region according to the header information.

  The reproduction key information stores key information for decrypting the encrypted content. If the reproduction conditions such as the number of reproductions, reproduction time limit, and reproduction area are available, the decryption key is extracted and the encrypted content is decrypted.

  Since these header information can be used illegally when tampered, it is desirable that the header information be encrypted and decrypted in a secure area that cannot be analyzed even by the owner of the mobile phone.

Next, the operation of the content reproduction system configured as described above will be described with reference to the sequence diagram of FIG.
Now, the time information distribution station 10 distributes the time information, and the position information distribution station 20 distributes the position information. The time information distribution station 10 can be applied to a mobile phone base station, and the location information distribution station 20 can be applied to a GPS satellite or a mobile phone base station. Here, it is assumed that each of the distribution stations 10 and 20 is a mobile phone base station.

  When receiving the time information from the time information distribution station 10 (ST1), the cellular phone device 30 verifies the validity of the time information (= whether it was distributed from the correct base station) (ST2). When the time information is valid, an internal clock (not shown) that cannot be adjusted from the outside is adjusted based on this time information. Similarly, when receiving the position information from the position information distribution station 20 (ST3), the mobile phone device 30 verifies the validity of the position information (= whether it has been distributed from the correct base station) (ST4).

  At the time of verification, an error correction code included in time information and position information is provided as redundant parity in advance, and a predetermined pattern of erasure symbols embedded in the parity part is detected. If this lost symbol cannot be detected, the time information and position information are determined to be false information. For example, the parity i1, j1, and k1 symbols are distributed as lost symbols in a certain time slot, and the parity i2, j2, and k2 symbols are distributed as lost symbols in a certain time slot.

  As a result of each verification, it is determined that the time information and the position information are valid.

  The cellular phone device 30 transmits a content distribution request to the distribution station 50 by the user's operation (ST5).

  The distribution station 50 distributes the encapsulated information including the header information and the encrypted content shown in FIG. 2 and the playback application to the mobile phone device 30 by normal encrypted distribution. This playback application cannot operate alone, and here, it is assumed that there is no DLL (Dynamic Link Library) file.

  When receiving the encapsulated information and the reproduction application (ST6), the cellular phone device 30 analyzes the header information in the encapsulated information. Since the header information may be tampered with in plain text, it is assumed that it is distributed by encrypted communication and analyzed in a secure area in the mobile phone as described above. Specifically, the number of playback times, playback time limit, playback position, etc. of the header information are analyzed, and the number of playback times corresponds to a predetermined number of times, the time of the internal clock corresponds to the playback time limit, or the position information corresponds to the playback position. Whether or not the content can be reproduced is determined depending on whether or not to perform (ST7). Here, a case where all are applicable and it is determined that reproduction is possible will be described.

  When the mobile phone device 30 determines that reproduction is possible (ST8), it transmits reproduction request information to the distribution station 50 (ST9). This reproduction request information includes mobile phone individual information. The mobile phone individual information is, for example, a device ID of the mobile phone, a requested time, a random number, and the like.

  The distribution station 50 generates an individualized reproduction application based on the reproduction request information and transmits it to the mobile phone device 30. The individualized reproduction application includes a DLL file for enabling the above-described reproduction application and mobile phone individual information in the reproduction request information. For this reason, even if the personalized reproduction application is transferred to another mobile phone or the like by copying or the like, the personalized reproduction application does not operate on the other mobile phone due to a different device ID.

  Upon receiving the personalized playback application (ST10), the cellular phone device 30 restores a playback application that can play back content from the personalized playback application and the playback application received in step ST6 (ST11). Further, the cellular phone device 30 collates the cellular phone individual information in the personalized reproduction application with the cellular phone individual information transmitted in step ST9 (ST12). Note that the order of steps ST11 and ST12 may be reversed.

  When the collation results match, the cellular phone device 30 decrypts the decryption key of the encrypted content from the reproduction key information of the header information of the encapsulated information by the restored reproduction application (ST13). Thereafter, the cellular phone device 30 decrypts and reproduces the encrypted content in the encapsulated information based on the decryption key (ST14). In addition, after the reproduction is completed, the mobile phone device 30 deletes at least the restored reproduction application and the individualized reproduction application. If desired, the playback application and the encapsulation information may be deleted.

  As described above, according to the present embodiment, when the time information including the verification information is distributed in advance, the validity of the time information is verified, and when the time information is valid, the internal information that cannot be adjusted from the outside. When the time is adjusted based on the time information and position information including verification information is distributed in advance, the validity of the position information is verified. As a result of each verification, the time information and position information are valid , It is determined whether the time indicated by the internal clock corresponds to the playback deadline (playback time information), and when the time information and the position information are valid as a result of each verification, the position information corresponds to the playback position information When the result of each determination corresponds to the playback deadline and playback position information, the playback application is restored to decrypt and play back the encrypted content. Delete . In this way, the use of distribution information can be controlled by time and place, and illegal secondary use of distribution information can be prevented.

  Supplementally, if the content does not match a predetermined time (playback period), location (playback position), and number of playbacks, the content cannot be played back, and after playback, the application and data for playing back the content are quickly deleted. Thus, illegal secondary use of the content and the reproduction application can be prevented.

  In addition, when distributing contents such as movies, which involve copyright, a large copyright fee may be generated. However, according to this embodiment, it is possible to control the period, place, and number of times that playback is possible, so it can be expected that a great amount of copyright fees can be reduced.

(Second Embodiment)
FIG. 4 is a schematic diagram showing the configuration of a content reproduction system according to the second embodiment of the present invention. The same parts as those in FIG. Mainly stated. In the following embodiments, the same description is omitted.

  That is, this embodiment is a specific example of the first embodiment, and particularly shows the mobile phone device 30, the time distribution station 10, and the location information distribution station 20 of FIG. 1 in detail.

  Here, the time distribution station 10 includes a time information generation unit 11, a time information verification information generation unit 12, and a time information transmission unit 13.

  The time information generation unit 11 generates time information and sends the time information to the time information verification information generation unit 12.

  The time information verification information generation unit 12 generates parity information (verification information) representing the time distribution station 10, adds this parity information to the time information received from the time information generation unit 11, and includes the obtained parity information. The time information is sent to the time information transmission unit 13.

  The time information transmission unit 13 transmits the time information received from the time information verification information generation unit 12.

  The location information distribution station 20 includes a location information generation unit 21, a location information verification information generation unit 22, and a location information transmission unit 23.

  The position information generation unit 21 generates position information and sends the position information to the position information verification information generation unit 222.

  The position information verification information generation unit 22 generates parity information (verification information) representing the position distribution station 20, adds this parity information to the position information received from the position information generation unit 21, and includes the obtained parity information. The position information is sent to the position information transmission unit 23.

  The position information transmission unit 23 transmits the position information received from the position information verification information generation unit 22.

  The cellular phone device 30 includes a time information reception unit 31, a time information verification unit 32, an internal time control unit 33, a position information reception unit 34, a position information verification unit 35, an information distribution request unit 36, an encapsulated information reception unit 37, a reproduction Application reception unit 38, encapsulated information decoding determination unit 39, memory 40, individualized reproduction application request unit 41, individualized reproduction application reception unit 42, information reproduction unit 43, reproduction application restoration unit 44, information display unit 45, and separation erasure A portion 46 is provided. Of the above, the time information verification unit 32, the position information verification unit 35, the encapsulated information decoding determination unit 39, the information reproduction unit 43, and the reproduction application restoration unit 44 are tamper resistant hardware from the viewpoint of improving security. It is preferably realized as a secure chip made of hardware.

  Here, the time information reception unit 31 receives time information from the time distribution station 10 and sends it to the time information verification unit 32.

  The time information verification unit 32 verifies the lost symbol in the time information received from the time information reception unit 32, and sends the time information to the internal time control unit 33 when the verification result indicates validity.

  The internal time control unit 33 controls the time of the internal clock based on the time information received from the time information verification unit 32.

  The position information receiving unit 34 receives position information from the position distribution station 20 and sends it to the position information verification unit 34.

  The location information verification unit 35 verifies the erasure symbol in the location information received from the location information reception unit 34, and sends the location information to the encapsulated information decoding determination unit 39 when the verification result shows validity. is there.

  The information distribution request unit 36 transmits a content distribution request to the distribution station 50 by a user operation.

  The encapsulated information receiving unit 37 receives encapsulated information in which header information and encrypted content are encapsulated from the distribution station 50, and sends this encapsulated information to the encapsulated information decryption determining unit 39.

  The reproduction application receiving unit 38 receives the reproduction application from the distribution station 50 and writes the reproduction application in the memory 40 under the control of the encapsulated information decoding determination unit 39.

  The encapsulation information decoding determination unit 39 converts the header information included in the encapsulation information received from the encapsulation information reception unit 37, the time information from the internal time control unit 33, and the position information from the position information verification unit 35. Based on this, the function for determining whether or not the content can be reproduced, the function for controlling the writing of the encapsulated information and the reproduction application to the memory 40 when reproduction is possible, and the information in the memory 40 are deleted when reproduction is not possible. And a function of controlling the separation / erasure unit 46 via the information reproducing unit 43.

  The memory 40 is a storage unit in the mobile phone device 30, and temporarily stores the encapsulated information, the reproduction application, the individualized reproduction application, the reproduction application after restoration, and the like so that they can be read / written / deleted. is there.

  The personalized reproduction application request unit 41 transmits reproduction request information to the distribution station 50 when the encapsulation information decoding determination unit 39 determines that reproduction is possible.

  The individualized reproduction application receiving unit 42 receives the individualized reproduction application transmitted from the distribution station 50 and temporarily writes it in the memory 40.

  The information playback unit 43 uses the restored playback application Ap1 in the memory 40 to decrypt the encrypted content in the encapsulated information and play back the content.

  The reproduction application restoration unit 44 has a function of restoring a reproduction application Ap1 that reproduces content from the reproduction application and the individualized reproduction application in the memory 40 and writing the reproduction application Apl in the memory 40.

  The information display unit 45 displays and reproduces, for example, moving images, sounds, and images in accordance with the content reproduction by the information reproduction unit 43.

  The separation / erasure unit 46 is controlled by the encapsulated information decoding determination unit 39 via the information playback unit 43, and when it is determined that the content is not to be played back, the playback application Ap1 in the memory 40 is separated again and obtained. For example, the individualized reproduction application is deleted or all information related to the reproduction application is deleted from the respective applications.

  Next, the operation of the content reproduction system configured as described above will be described.

  In the time distribution station 10, the time information generating unit 11 generates time information, and the time information verification information generating unit 12 generates parity information to which, for example, a lost symbol as a verification pattern is added. Then, the time information transmitting unit 13 transmits time information including parity information to the mobile phone device 30.

  Similarly, in the location information distribution station 20, the location information generation unit 21 generates location information, and the location information verification information generation unit 22 generates parity information to which, for example, an erasure symbol as a verification pattern is added. Then, the position information transmission unit 23 transmits position information including parity information to the mobile phone device 30.

  When the time information receiving unit 31 receives the time information to be transmitted, the cellular phone device 30 verifies whether the lost symbol exists in the pattern portion by the time information verification unit 32. As a result of the verification, if it is determined that the time information is delivered from the correct time delivery station 10, the time information is sent to the internal time control unit 33 to correct the internal time.

  When the position information receiving unit 34 receives the position information to be distributed, the position information verification unit 35 verifies whether or not an erasure symbol exists in the pattern portion. As a result of the verification, if it is determined that the location information is delivered from the correct location information delivery station 20, the location of the mobile phone device 30 is calculated based on that information.

  The user requests the distribution station 50 to distribute the content through the information distribution request unit 36 of the mobile phone device 30. Upon receiving the request, the distribution station 50 distributes the encapsulated information encapsulating the header information and the encrypted content and the reproduction application to the mobile phone device 30. In the cellular phone device 30, the encapsulation information receiving unit 37 receives the encapsulated information, and the playback application receiving unit 38 receives the playback application. The encapsulation information decoding determination unit 39 determines whether or not the content can be reproduced based on the time information from the internal time control unit 33 and the position information from the position information verification unit 35.

  Then, the encapsulated information and the reproduction application are stored in the memory 40 in the mobile phone.

  If it is determined that the encapsulated information decoding determination unit 39 can reproduce, the individualized reproduction application request unit 41 transmits reproduction request information to the distribution station 50, and the individual reproduction application transmitted from the distribution station 50 is transmitted. The data is received by the individualized reproduction application receiving unit 42 and temporarily stored in the memory 40 in the mobile phone device 30.

  Then, the reproduction application restoration unit 44 restores the reproduction application that reproduces the content from the previously transmitted reproduction application and the individualized reproduction application, and decrypts the encrypted content by the information reproduction unit 43 to reproduce the content. The information display unit 45 displays and reproduces, for example, moving images, sounds, and images.

After playing the content, the time information verification unit 32 continuously verifies whether the playback application and the content are available from the header information, and the internal time control unit 33 checks the time in the mobile phone at the correct current time. Set the time. Similarly, with respect to the position information, the position information verification unit 35 verifies the certainty of the position information, and the encapsulated information decoding determination unit 39 determines the position information obtained and the previously corrected time. Then, it is determined whether the content can be used continuously.
If the content can be used, the information reproducing unit 43 reproduces the content.

  However, when the content is out of the usage period, the number of times of reproduction has exceeded, or it is out of the reproducible region, the separated reproduction unit 46 separates the restored reproduction application again, for example, individualized reproduction Delete the application or delete all information related to the playback application.

  As a result, if the content cannot be reproduced, the reproduction application itself is also deleted, so that unauthorized use of the content can be prevented.

  Note that the position / time information verification units 32 and 35 that verify the validity of the position information and time information, the analysis unit that analyzes the header information, and the separation / erasure unit 36 that separates and erases the playback application are even mobile phone owners. It is desirable that the processing content be processed by a tamper resistant device or a tamper resistant software that cannot see the processing content.

  As described above, according to the present embodiment, the same effect as that of the first embodiment can be obtained with the configuration embodying the first embodiment.

(Third embodiment)
Next, the third to fifth embodiments of the present invention will be described, but an outline will be described before that.

  The third to fifth embodiments are examples specifically showing the reproduction application restoration unit 44 in the second embodiment. Specifically, the playback application restoring unit 44 restores the individualized playback application secretly distributed to each of the servers Sv1 and Sv2 of the distribution station 50 before restoring the Apl in addition to the function of restoring the playback application Apl described above. The original individualized reproduction application C is restored.

  Therefore, in the third to fifth embodiments, the function of restoring the original individualized reproduction application C is mainly described.

  FIG. 5 is a schematic diagram showing a configuration of a content reproduction system according to the third embodiment of the present invention.

  In the present embodiment, as described above, the playback application restoring unit 44 restores the individualized playback application secretly distributed to each of the servers Sv1 and Sv2 before restoring the playback application Apl. It is supposed to be restored.

Here, the original individualized reproduction application C is secretly distributed into two pieces of information, that is, the encrypted distributed information E (K _P1 , S ′) and the encrypted calculated value E (K _P1 , S ′). Managed by the servers Sv1, Sv2.

Encrypted distributed information E (K _P1, S) is the original shared information S composed of a random number r having the same bit length as the bit length of the individualized playback application C is encrypted by K _P1 by the terminal-specific information information E (K _P1 , S).

The encrypted calculated value E (K _P1 , S ′) is obtained by encrypting the calculated value S ′ calculated as an exclusive OR of the above-described shared information S and the original individualized reproduction application C with the terminal specific information K _P1. The value E (K _P1 , S ′) obtained by the conversion.

Therefore, both can be restored to the original individualized reproduction application C by performing an exclusive OR operation on the results S and S ′ decrypted by the terminal specific information K _P1 .

  Here, the reproduction application restoration unit 44 includes a control unit 44A, a terminal specific information storage unit 44B, an individualization release unit 44C, and a distributed program restoration unit 44D.

The reproduction application restoring unit 44 uses the following units 44A to 44D to obtain the individualized reproduction application {encrypted distributed information E (K _P1 , S) and encrypted calculated value E (K _P1 , S ′)} in the memory 40. A function to restore and a function to write the individualized reproduction application (C) obtained by the restoration into the memory 40 are provided.

The resulting control unit 44A is individualized reproduction application in the memory 40 so as to restore the _{{E (K P1, S)} , E (K P1, S ')}, a function of controlling each unit 44B～44D, the restoring The terminal-specific information storage unit 44B having a function of writing the individualized playback application (C) thus written into the memory 40 stores terminal-specific information K _P1 as playback request information (device ID, time, random number, etc.). This is a tamper-resistant memory and can be read / written from the control unit 44A. The terminal specific information K _P1 is information used when releasing individualization of the individualized reproduction application, and a unique value (key or ID or the like) is used for each terminal device. Here, the term “individualization” means “encryption that can be decrypted only by a specific mobile phone device 30”, and the term “cancel individualization” means “decryption”.

The personalization release unit 44C receives the terminal specific information K _P1 , the encrypted shared information E (K _P1 , S), and the encrypted calculated value E (K _P1 , S ′) from the control unit 44A. Based on K _P1 , the encrypted shared information E (K _P1 , S) and the encrypted calculated value E (K _P1 , S ′) are decrypted (and the individualization is released), and the distributed information S and the calculated value S are obtained. And a function of outputting the obtained distributed information S and calculated value S ′ to the control unit 44D.

The distributed program restoration unit 44D calculates an exclusive OR of the distributed information S input from the control unit 44A and the calculated value S ′, and controls the obtained calculation result C (or key information K, key ID _k ). It has a function of outputting to the unit 44A.

  On the other hand, the distribution station 50 includes first and second distribution station servers Sv1 and Sv2.

The first server device Sv1 has a function of storing the encrypted shared information E (K _P1 , S) in the memory among the personalized reproduction applications that have been secretly shared in advance, and a memory based on a request from the mobile phone device 30. And the function of transmitting the encrypted distributed information E (K _P1 , S) to the mobile phone device 30.

The second server device Sv2 is based on the function of storing the encrypted calculated value E (K _P1 , S ′) in the memory among the personalized reproduction applications secretly distributed in advance and the request from the mobile phone device 30. And a function of transmitting the encryption calculated value E (K _P1 , S ′) in the memory to the mobile phone device 30.

Next, the operation of the content reproduction system configured as described above will be described.
Now, the encrypted distributed information E obtained by secret sharing and individualized individualized playback application C (K _P1, S) and the encrypted calculated value E (K _P1, S ') are respectively first and second server Sv1 , Sv2 is stored.

  On the other hand, it is assumed that the cellular phone device 30 performs the same process as described above and requests the individualized reproduction application to the first and second server devices Sv1 and Sv2 as the distribution station 50.

When the first and second server devices Sv1 and Sv2 receive the requests, respectively, the encrypted shared information E (K _P1 , S) and the calculated encryption value E (K _P1 , S ′) are individually sent to the mobile phone device 30. Send back.

The individualized reproduction application receiving unit 42 writes the received encrypted shared information E (K _P1 , S) and the encrypted calculated value E (K _P1 , S ′) in the memory 40.

In the reproduction application restoration unit 44, the control unit 44A obtains the encrypted _shared information E (K _P1 , S) and the encrypted calculated value E (K _P1 , S ′) corresponding to the individual reproduction application before restoration from the memory 40. In addition to reading, the terminal unique information K _P1 is read from the terminal unique information storage unit 44B.

The control unit 44A inputs the terminal unique information K _{P1, the} input encrypted shared information E (K _P1 , S), and the calculated encryption value E (K _P1 , S ′) to the individualization release unit 44C.

The individualization release unit 44C decrypts the encrypted shared information E (K _P1 , S) and the encrypted calculated value E (K _P1 , S ′) based on the terminal specific information K _P1 (and releases the individualization). And the shared information S and the calculated value S ′ are restored. The individualization release unit 44C outputs the shared information S and the calculated value S ′ to the control unit 44A.

  The control unit 44A inputs the distribution information S and the calculated value S ′ to the distributed program restoration unit 44D. The distributed program restoration unit 44D calculates an exclusive OR of the distributed information S and the calculated value S ′, and obtains a calculation result C. Since the calculation result C corresponds to the individualized reproduction application C, the original individualized reproduction application is restored. The distributed program restoration unit 44D outputs the individualized reproduction application C to the control unit 44A.

  The control unit 44A writes the individualized reproduction application C in the memory 40.

  As described above, in the mobile phone device 30, the playback application restoring unit 44 restores the playback application Ap1 that plays back content from the playback application in the memory 40 and the personalized playback application C, and stores the playback application Apl in the memory 40. Write to. In addition, the information reproducing unit 43 decrypts the encrypted content in the encapsulated information and reproduces the content by the restored reproduction application Ap1 in the memory 40.

According to the present embodiment as described above, in addition to the effects of the second embodiment, individualized by secret sharing personalization playback application, resulting plurality of encrypted information E (K _P1, S) and ( Since E (K _P1 , S) is secretly distributed to each server Sv1, Sv2 of the distribution station, and the playback application restoration unit 44 restores the individualized playback application, the security of the personalized playback application is improved. Can be improved.

(Fourth embodiment)
FIG. 6 is a schematic diagram showing a configuration of a content reproduction system according to the fourth embodiment of the present invention.

This embodiment is a modification of the third embodiment, and the original individualized reproduction application C has two distributed key information K ′ (= g ^r mod p) and encryption application E (K, C). The information is secretly distributed and managed by the servers Sv1 and Sv2 of the distribution station 50.

The distributed key information K ′ is a key value K ′ calculated based on the random number r, the primitive element g of the multiplicative group, and the large prime number p, and calculates the individualized key K (= (g ^r ) ^K _P1 mod p). The value used for.

  The encryption application E (K, C) is information E (K, C) obtained by encrypting the original individual reproduction application C based on the individual key K described above.

Therefore, according to both K ′ and E (K, C), the individualized key K is calculated from the distributed key information K ′ by the terminal unique information K _P1 , and the encryption application E (K) is based on the individualized key K. , C), the original individualized reproduction application C can be restored.

  Here, the reproduction application restoration unit 44 includes a control unit 44E, a terminal unique information storage unit 44B, an individualized key restoration processing unit 44F, and an individualization processing unit 44G.

  The reproduction application restoring unit 44 restores the individual reproduction application {distributed key information K ′ and encrypted application E (K, C)} in the memory 40 by the following units 44B and 44E to 44G, and the restoration. It has a function of writing the obtained individualized reproduction application (C) into the memory 40.

The control unit 44E controls the units 44B, 44F, and 44G so as to restore the individual reproduction application {K ′, E (K, C)} in the memory 40, and the individual reproduction obtained by the restoration. The terminal specific information storage unit 44B having the function of writing the application (C) into the memory 40 is as described above.

The personalization key restoration processing unit 44F, based on the terminal unique information K _P1 and the distributed key information K ′ (= g ^r mod p) input from the control unit 44E, the personalization key K (= (g ^r ) ^K _P1 mod p) =) is calculated, and the obtained individualized key information K is transmitted to the control unit 44E.

  When the personalization key information K and the encryption application E (K, C) are input from the control unit 44E, the personalization processing unit 44G selects the encryption application E (K, C) based on the personalization key information K. It has a function of decrypting (and releasing individualization) and restoring the original individualized reproduction application C and a function of outputting the obtained individualized reproduction application C to the control unit 44E.

  On the other hand, the distribution station 50 includes first and second distribution station servers Sv1 and Sv2.

  The first server device Sv1 stores the distributed key information K ′ in the memory based on the function of storing the distributed key information K ′ in the memory among the individualized reproduction applications secretly distributed in advance and the request from the mobile phone device 30. And a function of transmitting 'to the mobile phone device 30.

  The second server device Sv2 stores the encrypted application E (K, C) in the memory among the personalized playback applications that have been secretly shared in advance, and the request from the mobile phone device 30 based on the function in the memory. A function of transmitting the encrypted application E (K, C) to the mobile phone device 30;

Next, the operation of the content reproduction system configured as described above will be described.
Now, it is assumed that the distributed key information K ′ obtained by secret sharing and individualizing the individualized reproduction application C and the encrypted application E (K, C) are stored in the first and second server devices Sv1, Sv2, respectively. .

  On the other hand, it is assumed that the cellular phone device 30 performs the same process as described above and requests the individualized reproduction application to the first and second server devices Sv1 and Sv2 as the distribution station 50.

  When receiving the request, the first and second server devices Sv1 and Sv2 individually return the distributed key information K ′ and the encrypted application E (K, C) to the mobile phone device 30.

  The individualized reproduction application reception unit 42 writes the received distributed key information K ′ and the encrypted application E (K, C) in the memory 40.

In the reproduction application restoring unit 44, the control unit 44E reads the distributed key information K ′ and the encrypted application E (K, C) corresponding to the individualized reproduction application before restoration from the memory 40, and the terminal specific information storage unit Terminal specific information K _P1 is read from 44B.

The control unit 44E inputs the terminal unique information K _P1 and the input distributed key K ′ to the individualized key restoration processing unit 44F.

The individualized key restoration processing unit 44F obtains the individualized key K (= (g ^r ) ^K _P1 mod p) =) based on the terminal unique information K _P1 and the distributed key information K ′ (= g ^r mod p). The personalized key information K obtained by restoration is sent to the control unit 44E.

  The control unit 44E inputs the individualization key information K and the encryption program E (K, C) to the individualization processing unit 44G.

  The individualization processing unit 44G decrypts the encrypted application E (K, C) based on the individualization key information K (and cancels the individualization), and restores the original individualized reproduction application C. Further, the individualization processing unit 44G outputs the obtained individualized reproduction application C to the control unit 44E.

  The control unit 44E writes the individualized reproduction application C in the memory 40.

  As described above, in the cellular phone device 30, the reproduction application Ap1 is restored by the reproduction application restoration unit 44, and the reproduction application Apl is written in the memory 40. In the information reproduction unit 43, the encrypted content in the encapsulated information is decrypted and the content is reproduced by the restored reproduction application Ap1.

  As described above, according to the present embodiment, the individualized reproduction application C is secretly distributed and individualized, and the reproduction application restoration unit 44 restores the individualized reproduction application, so that it is the same as in the third embodiment. The effect of can be obtained.

(Fifth embodiment)
FIG. 7 is a schematic diagram showing a configuration of a content reproduction system according to the fifth embodiment of the present invention.

This embodiment is a modification of the fourth embodiment, and when the original individualized reproduction application C is secretly shared, the random number r itself is distributed as distributed information S ₀ , S _{1 to} S ₃ , and the original The original g and the encrypted application E (K, C) are also distributed, and the distributed information is managed by the servers Sv1 to Sv8 of the distribution station 50. The primitive element g and the encryption application E (K, C) are as described above.

  The shared information S0 is first shared information generated by a (k, n) threshold method that can restore the content from k pieces of information out of all n pieces. The (k, n) threshold method is described in Non-Patent Document 2.

The shared information S1 to S3 is the second shared information generated by the threshold method (| Ai |, | Ai |) whose contents can be restored from | Ai | | A _i | is the number of server devices belonging to A _i .

Here, a secret sharing method necessary for generating the shared information S ₀ , S _{1 to} S ₃ of the random number r will be described. The random number r is secretly shared into several pieces of shared information, and the shared information is assigned to each server device Sv1,. At this time, the secret sharing method of the present embodiment is expressed by the following (a) to (c).

(A) a group of any (L + 1) stage of the server apparatus, to restore the random number r, also minimum group A ₁ consisting of L stand following _server, ..., A _d may also recover the random number r. Note that the minimal group is a group in which the random number r cannot be restored if even one of the server devices of the group is missing among the groups capable of restoring the random number r.

(B) A set of server devices included in a group that is a minimal group among a group of arbitrary (L + 1) server devices is A _0, and the number of server devices included in A ₀ is n ′. . At this time, the first shared information S ₀ = {s ₁ ,..., S _n ′} for the random number r is obtained by the (L + 1, n ′) threshold method, and included in S ₀ in the server device included in A _0. Allocate one piece of distributed information without duplication.

To (c) each minimum group _{A i (1 ≦ i ≦ d} ), (| A i |, | A i |) by the threshold method, the second shared information for random number _{r S i = {s {i} , _{1}, ..., s {i} , | Ai |}} look, assigns no overlap one distributed information included in S _i to the server apparatus included in a _i.

  Since this embodiment uses the secret sharing method represented by (a) to (c) above, it is possible to reduce the number of shared information allocated to each server device Sv1 to Sv6, which is very effective in implementation. It is. For example, for each of the server devices Sv1,..., Sv6, it is assumed that eight minimum groups U1 to U8 that can restore the random number r are determined as shown in FIG.

In this case, in the secret sharing method of the present embodiment, L = 3, n = n ′ = 6, d = 3, and the minimal groups A ₀ ,..., A ₃ are as shown in FIG.

  Therefore, in this case, as shown in FIG. 10, the number of shared information allocated to each server device Sv1 to Sv6 is Sv1: 3, Sv2: 3, Sv3: 3, Sv4: 3, Sv5: 1. And Sv6: 1.

  On the other hand, in the conventional method (for example, see Non-Patent Document 3), since it is necessary to perform the process (c) on all the minimal groups U1 to U8, the number of distributed information allocated to each server device Sv1 to Sv6 is As shown in FIG. 11, Sv1: 4, Sv2: 4, Sv3: 5, Sv4: 5, Sv5: 5, Sv6: 5. Thus, it can be seen that the conventional method is inefficient because it requires a larger amount of distributed information than the present embodiment.

In any case, according to the distribution information S0, S1 to S3 of the random number r, the random number r can be restored. Further, by calculating the individualized key K from the restored random number r, the primitive element g and the terminal unique information K _P1 , and decrypting the encrypted application E (K, C) based on the individualized key K, The original individualized reproduction application C can be restored.

  Here, as shown in FIG. 7, the reproduction application restoration unit 44 includes a control unit 44H, a terminal specific information storage unit 44B, a random number restoration unit 44I, an individualized key restoration processing unit 44J, and an individualization processing unit 44G.

  The reproduction application restoration unit 44 has a function of restoring the individual reproduction application {distributed key information K ′ and encrypted application E (K, C)} in the memory 40 by the following units 44B, 44H to 44J, 44G; It has a function of writing the individualized reproduction application (C) obtained by the restoration into the memory 40.

The control unit 44H controls the respective units 44B, 44I, 44J, and 44G so as to restore the individualized reproduction application {eg, S ₃ , K ′, E (K, C)} in the memory 40, and the restoration. The terminal specific information storage unit 44B having the function of writing the individualized reproduction application (C) obtained by the above into the memory 40 is as described above.

The random number restoration unit 44I has a function of restoring the random number r based on any of the shared information S _{0 to} S ₃ input from the control unit 44H and a function of sending the obtained random number r to the control unit 44H. .

The personalization key restoration processing unit 44J obtains the personalization key K (= (g ^r ) ^K _P1 mod p) =) based on the random number r, the primitive element g, and the terminal unique information K _P1 input from the control unit 44H. It has a function of calculating and sending the obtained personalized key information K to the control unit 44H.

  The individualization processing unit 44G is as described above.

  On the other hand, the distribution station 50 includes first to eighth distribution station servers Sv1 to Sv8.

  The first to sixth server devices Sv1 to Sv6 are based on the function of storing the combination of the distributed information S0 and S1 to S3 in the memory and the request from the mobile phone device 30 among the individualized reproduction applications secretly distributed in advance. And the function of transmitting the distributed information S0, S1 to S3 in the memory to the mobile phone device 30.

  The seventh server device Sv7 uses the function of storing the primitive element g in the memory among the personalized reproduction applications that have been secretly shared in advance, and the primitive element g in the memory based on the request from the cellular phone device 30. And a function of transmitting to the device 30.

  The eighth server device Sv2 stores the encrypted application E (K, C) in the memory among the personalized reproduction applications that have been secretly shared in advance, and a request from the mobile phone device 30 based on the request from the mobile phone device 30. A function of transmitting the encrypted application E (K, C) to the mobile phone device 30;

Next, the operation of the content reproduction system configured as described above will be described.
Now, shared information S0 to S3 obtained by secret sharing and individualizing the individualized reproduction application C, the primitive element g, and the encryption program E (K, C) are stored in the first to eighth server devices Sv1 to Sv8, respectively. Suppose that

On the other hand, it is assumed that the cellular phone device 30 performs the same process as described above, and requests the individualized reproduction application to each of the server devices Sv2 to Sv4, Sv7, and Sv8 as the distribution station 50. That is, for the second to fourth server Sv2~Sv4 belonging to minimum group _{A 3,} and requests the second shared information _{S 3} as shown in FIG. 10. Further, it is assumed that the mobile phone device 30 requests information from the seventh and eighth server devices Sv7 and Sv8.

Each server device Sv2~SV4, Sv7, Sv8, when each receiving the request, the shared information _{S 3 (= S {3,1}} , S {3,2}, S {3,3}), the primitive element g and The encryption program E (K, C) is individually returned to the mobile phone device 30.

The individualized reproduction application reception unit 42 writes the received shared information S ₃ , primitive element g, and encrypted application E (K, C) in the memory 40.

In the reproduction application restoration unit 44, the control unit 44H uses the shared information S ₃ (= S {3,1}, S {3,2}, S {3,3) corresponding to the individual reproduction application before restoration from the memory 40. }), a primitive element g and encryption applications E (K, C) with reading and inputs the distributed information _{S 3} to the random number restoring unit 44I.

Random number restoring unit 44I restores the random number r from this shared information _{S 3.} Specifically, the random number restoration unit 44I restores the random number r in the following (α) or (β).

(Α) When the input shared information is the distributed information included in S ₀ and the input number is (L + 1) or more, r is restored by the (L + 1, n ′) threshold method.

(Β) When the input shared information is shared information included in S _i (1 ≦ i ≦ d), and the input number is | A _i | or more, (| A _i |, | A _i | ) Restore r by the threshold method. The obtained random number r is output to the control unit 44H.

The control unit 44H inputs the random number r, the primitive element g, and the terminal unique information K _P1 to the individualized key restoration processing unit 44J.

The individualized key restoration processing unit 44J restores the individualized key K (= (g ^r ) ^K _P1 mod p) =) based on the random number r, the primitive element g, and the terminal unique information K _P1 (ST43R-2). ), The obtained individualized key information K is sent to the control unit 44H.

  The control unit 44H inputs the individualization key information K and the encryption program E (K, C) to the individualization processing unit 44G.

  The individualization processing unit 44G decrypts the encrypted application E (K, C) based on the individualization key information K (and cancels the individualization), and restores the original individualized reproduction application C. Further, the individualization processing unit 44G outputs the obtained individualized reproduction application C to the control unit 44H.

  The control unit 44H writes the individualized reproduction application C in the memory 40.

  As described above, in the cellular phone device 30, the reproduction application Ap1 is restored by the reproduction application restoration unit 44, and the reproduction application Apl is written in the memory 40. In the information reproduction unit 43, the encrypted content in the encapsulated information is decrypted and the content is reproduced by the restored reproduction application Ap1.

As described above, according to the present embodiment, the encrypted application E (K, K) in which the personalized reproduction application is encrypted based on the personalized key information K generated based on the random number r and the terminal specific information K _P1 . C) and the first and second shared information S ₀ , S _{1 to} S _{3 obtained} by secretly sharing the random number r are secretly distributed to the server devices Sv 1 to Sv 8, and the reproduction application restoring unit 44 performs the encryption during program processing. Since the personalized reproduction application C is restored from the personalized application E (K, C) and the shared information (eg, S ₃ ), the security of the personalized reproduction application can be improved. Further, since the (k, n) threshold method and the (| Ai |, | Ai |) threshold method are used when the secret sharing method is used, the (| Ai |, | Ai |) threshold value is used. Compared to the case where only the method is used, the number of shared information can be suppressed (see FIGS. 10 and 11).

  The method described in each of the above embodiments is a program that can be executed by a computer, such as a magnetic disk (floppy (registered trademark) disk, hard disk, etc.), an optical disk (CD-ROM, DVD, etc.), a magneto-optical disk ( MO), and can be stored and distributed in a storage medium such as a semiconductor memory.

  In addition, as long as the storage medium can store a program and can be read by a computer, the storage format may be any form.

  In addition, an OS (operating system) operating on the computer based on an instruction of a program installed in the computer from the storage medium, MW (middleware) such as database management software, network software, and the like implement the present embodiment. A part of each process may be executed.

  Further, the storage medium in the present invention is not limited to a medium independent of a computer, but also includes a storage medium in which a program transmitted via a LAN, the Internet, or the like is downloaded and stored or temporarily stored.

  Further, the number of storage media is not limited to one, and the case where the processing in the present embodiment is executed from a plurality of media is also included in the storage media in the present invention, and the media configuration may be any configuration.

  The computer according to the present invention executes each process according to the present embodiment based on a program stored in a storage medium, and includes a single device such as a personal computer or a system in which a plurality of devices are connected to a network. Any configuration may be used.

  In addition, the computer in the present invention is not limited to a personal computer, but includes a processing unit, a microcomputer, and the like included in an information processing device, and is a generic term for devices and devices that can realize the functions of the present invention by a program. .

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

1 is a schematic diagram illustrating a configuration of a content reproduction system to which a distribution information reproduction method according to a first embodiment of the present invention is applied. It is a schematic diagram for demonstrating the encapsulation information in the embodiment. It is a sequence diagram for demonstrating the operation | movement in the embodiment. It is a schematic diagram which shows the structure of the content reproduction system which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the content reproduction system which concerns on the 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the content reproduction system which concerns on the 4th Embodiment of this invention. It is a schematic diagram which shows the structure of the content reproduction system which concerns on the 5th Embodiment of this invention. It is a schematic diagram for demonstrating the minimum group in the same embodiment. It is a schematic diagram for demonstrating the minimum group in the same embodiment. It is a schematic diagram for demonstrating the number of the shared information in the same embodiment. It is a schematic diagram for demonstrating the number of the distributed information by a conventional method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Time distribution station, 11 ... Time information generation part, 12 ... Time information verification information generation part, 13 ... Time information transmission part, 20 ... Position information distribution station, 21 ... Position information generation part, 22 ... Position information verification information generation , 23 ... Location information transmission unit, 30 ... Mobile phone device, 31 ... Time information reception unit, 32 ... Time information verification unit, 33 ... Internal time control unit, 34 ... Location information reception unit, 35 ... Location information verification unit, 36 ... Information distribution request unit, 37 ... Encapsulated information receiving unit, 38 ... Reproduction application receiving unit, 39 ... Encapsulated information decoding determination unit, 40 ... Memory, 41 ... Individualized reproduction application request unit, 42 ... Individualized reproduction application Receiving unit, 43 ... information reproducing unit, 44 ... reproducing application restoring unit, 44A, 44E, 44H ... control unit, 44B ... terminal specific information storing unit, 44C ... individualization releasing unit, 44 ... distributed program restoration unit, 44F ... individualized key restoration processing unit, 44G ... individualization processing unit, 44I ... random number restoration unit, 44J ... individualized key restoration processing unit, 45 ... information display unit, 46 ... separation erasure unit, 50 ... delivery station.

Claims (6)

A distribution information reproducing apparatus capable of reproducing distribution information distributed including reproduction time information and reproduction position information,
When time information including verification information is distributed in advance, time information verification means for verifying validity of the time information based on the verification information;
As a result of the verification, when the time information is valid, an internal clock adjustment means for adjusting an internal clock that cannot be adjusted from the outside based on the time information;
When positional information including verification information is distributed in advance, positional information verification means for verifying the validity of the positional information based on the verification information;
As a result of each verification, when the time information and the position information are valid, reproduction time determination means for determining whether the time indicated by the internal clock corresponds to the reproduction time information;
As a result of each verification, when the time information and the position information are valid, reproduction position determination means for determining whether the position information corresponds to the reproduction position information;
As a result of each determination, when corresponding to the reproduction time information and the reproduction position information, reproduction means for reproducing the distribution information;
Distribution information deleting means for deleting the distribution information after the end of the reproduction;
A distribution information reproducing apparatus comprising: The distribution information reproducing apparatus according to claim 1,
The verification information includes an error correction code as redundant parity, and an erasure pattern including a pattern indicating a valid base station is provided in the parity part.
The time information verification means verifies the validity of the time information by detecting an erasure pattern from the verification information included in the time information,
The distribution information reproducing apparatus characterized in that the position information verification means verifies the validity of the position information by detecting an erasure pattern from the verification information included in the position information. A program used for a distribution information reproducing apparatus capable of temporarily storing distribution information distributed including reproduction time information and reproduction position information in a memory and reproducing the information.
A computer of the distribution information reproducing apparatus;
When time information including verification information is distributed in advance, time information verification means for verifying the validity of the time information based on the verification information;
As a result of the verification, when the time information is valid, an internal clock adjusting means for adjusting an internal clock that cannot be adjusted from the outside based on the time information;
When location information including verification information is distributed in advance, location information verification means for verifying the validity of the location information based on the verification information;
As a result of each verification, when the time information and the position information are valid, reproduction time determination means for determining whether the time indicated by the internal clock corresponds to the reproduction time information in the memory;
As a result of each verification, when the time information and the position information are valid, reproduction position determination means for determining whether the position information corresponds to reproduction position information in the memory;
Reproduction means for reproducing the distribution information in the memory when the result of each determination corresponds to the reproduction time information and the reproduction position information;
Distribution information deleting means for deleting the distribution information from the memory after the end of the reproduction;
Program to function as. In the program according to claim 3,
The verification information includes an error correction code as redundant parity, and an erasure pattern including a pattern indicating a valid base station is provided in the parity part.
The time information verification means includes a procedure for verifying the validity of the time information by detecting a disappearance pattern from the verification information included in the time information,
The location information verification means includes a procedure for verifying the validity of the location information by detecting an erasure pattern from the verification information included in the location information. A distribution information reproduction method executed by a distribution information reproduction apparatus capable of reproducing distribution information distributed including reproduction time information and reproduction position information,
When time information including verification information is distributed in advance, a time information verification step of verifying the validity of the time information based on the verification information;
As a result of the verification, when the time information is valid, an internal clock adjustment step of adjusting an internal clock that cannot be adjusted from the outside based on the time information;
When location information including verification information is distributed in advance, a location information verification step for verifying the validity of the location information based on the verification information;
As a result of each verification, when the time information and the position information are valid, a reproduction time determination step of determining whether the time indicated by the internal clock corresponds to the reproduction time information;
As a result of each verification, when the time information and the position information are valid, a reproduction position determination step of determining whether the position information corresponds to the reproduction position information;
As a result of each determination, when corresponding to the reproduction time information and the reproduction position information, a reproduction step for reproducing the distribution information;
A distribution information deletion step of deleting the distribution information after the end of the reproduction;
A method for reproducing distribution information, comprising: In the delivery information reproduction method according to claim 5,
The verification information includes an error correction code as redundant parity, and an erasure pattern including a pattern indicating a valid base station is provided in the parity part.
The time information verification step verifies the validity of the time information by detecting an erasure pattern from the verification information included in the time information,
The distribution information reproducing method characterized in that the location information verification step verifies the validity of the location information by detecting an erasure pattern from the verification information included in the location information.

Images