JP2006119768A - Distribution data management system and method for managing distribution data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the illegal use of a data file by accurately distributing data in accordance with a data usable period so as to provide a new service model. <P>SOLUTION: A data distribution server 2 is provided with: a data selection means for adding information on a data usable period to data; and a distribution means 22 for distributing the data. A mobile communication apparatus 1 is provided with: a data storage means 12 for storing the data; a time information acquisition means 14 for acquiring present time information; a data utilization permission/rejection decision means 15 for comparing the present time information with the information concerned with the data usable period and deciding whether the present time information satisfies the data usable period or not; and a data deletion means 16 for deleting the data when the present time information does not satisfy the data usable period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a distribution data management system and a distribution data management method for managing distributed data using an available period or an available area in the field of information distribution to a mobile network.

  In recent years, computer networks have been developed, and mobile communication networks such as mobile networks have been actively performed among a plurality of computers. Accordingly, it has become possible to easily provide information and services required by users by accessing various information service centers using mobile communication devices. For example, ITS (Intelligent Transport System) is built to solve road traffic problems such as traffic accidents and traffic jams by networking people, roads and vehicles with information using the most advanced information communication technology. A system has been proposed. In particular, the portable information terminal has the advantage that it is portable and can perform information retrieval, information processing, communication processing and the like without being restricted by time and place, while a copy guard problem occurs. Therefore, a service that prohibits secondary use of distributed data by copy guard or the like is realized.

  As a conventional example of this distribution data management method, there is a regional information distribution apparatus described in Patent Document 1. In order to enable broadcast-type distribution of information related to the characteristics of the user of the portable information terminal and information that changes with time, the distribution server (earth information distribution apparatus) is transmitted from the portable information terminal by the transmission / reception means. Attribute information including information related to the user of the portable information terminal is received, and position information indicating the current position of the portable information terminal is detected by the position information detecting means. Also, notice information storage means (static information storage means) for storing static information that does not change over time, and vacant seat information storage means (dynamic information storage) for storing dynamic information that is automatically updated over time. Information), the information determining means refers to the attribute information and the position information, determines information to be read from the notice information storage means and the vacant seat information storage means, processes the information into distribution information by the information processing means, and transmits and receives The information is transmitted from the means to the portable information terminal. In this conventional example, static information that does not change with time and dynamic information that is automatically updated with time are referred to by referring to the position information of the mobile information terminal existing in a specific area and the attribute information of the user. Since the selection information is determined and the distribution information to be distributed to the portable information terminal is created and distributed, the distribution server can distribute the periodically collected information for the convenience of the user. .

In addition, the information terminal device described in Patent Document 2 is a device that performs authentication with the server device when transmitting the location time information calculated using the GPS function to the server device. Is a device that performs authentication between the mobile phone and the server device when transmitting information on the position and time obtained using the GPS function to the server device. Further, the location time information is transmitted to the server device only when the server device is authenticated as a valid connection target. That is, it is determined whether or not the information processing apparatus is a valid connection target based on the authentication information transmitted and received by the transmission / reception means, and only from the satellite signal when it is authenticated as a valid connection target. It comprises authentication means for transmitting the calculated current position and position time information relating to the current time by the transmitting / receiving means. This prevents information related to the current position and time information calculated using the global positioning system, that is, position time information, from leaking to a third party unintended by the user, via a communication network. Position time information can be transmitted and received with an information processing device safely and reliably.
JP 2003-196181 A JP 2004-32376 A

However, in the above-mentioned Patent Document 1, a copy guard for distributed data is provided, but there is no technique for copy guard depending on time and area. There was a problem that unauthorized use of files could not be prevented.
Further, in Patent Document 2, although it is possible to perform copy guarding to some extent depending on time or area with a technology that authenticates according to time or area, since the user and the data distribution company simply authenticate each other, There is a problem that various data cannot be distributed according to the position.

The present invention has been made to solve the above-described problems, and a distribution data management system capable of preventing unauthorized use of a data file by accurately distributing data according to a period unit or an area unit, and An object is to provide a distribution data management method.
Another object of the present invention is to provide a distribution data management system and a distribution data management method that can distribute various data according to time or position under a specific situation and can provide a new service model. .

  In order to solve the above-mentioned problem, the distribution data management system according to claim 1 is a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network. The server selects the data requested from the mobile communication device, adds data relating to the data availability period to the data, and the data along with the information relating to the data availability period. A data distribution unit that distributes to a communication device, wherein the mobile communication device includes a data storage unit that stores information related to the data distributed from the data distribution unit and a usable period of the data, and a GPS satellite. Receives the GPS signal to be transmitted and obtains the current time information contained in the GPS signal Comparing the current time information acquired by the time information acquisition unit with information on a usable period of the data stored in the data storage unit, and the current time information Is a result of the data use permission / rejection determination unit that determines whether or not the usable period of the data is satisfied, and as a result of the data use permission / rejection determination unit, the current time has passed the available period And a data deleting means for deleting the data. According to this configuration, the data distribution server can accurately distribute the data according to the period in which the data can be used, and thus can prevent unauthorized use of the data file.

  The distribution data management system according to claim 2 is a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network, wherein the data distribution server is a mobile communication device. Data selecting means for selecting requested data from the data, and adding information relating to the area where the data can be used to the data, and data for distributing the data to the mobile communication device together with information relating to the area where the data can be used Distribution means, wherein the mobile communication device stores the data distributed from the data distribution means and data storage means for storing information relating to the area where the data can be used, and current location information using a GPS satellite. Position information acquisition means for acquiring the current position acquired by the position information acquisition means The data is compared with the information on the area where the data is available that is stored in the data storage means, and the data for determining whether the current position information satisfies the area where the data can be used And a data deletion unit that deletes the data when the current position is out of the usable area as a result of the data usage permission determination unit. . According to this configuration, the data distribution server can accurately distribute data according to the area where the data can be used, and thus can prevent unauthorized use of the data file.

  The distribution data management system according to claim 3 is a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network. The data distribution server includes a mobile communication device. Data selection means for selecting requested data and adding information relating to the period or area in which the data can be used to the data, and the mobile communication device together with information relating to the period or area in which the data can be used A data distribution means for distributing the data to the mobile communication device, and the mobile communication device includes a data storage means for storing information related to the data distributed from the data distribution means and an available period or area of the data, and a GPS satellite. The GPS signal to be transmitted is received and the current GPS signal is included Time information / position information acquisition means for acquiring time information or current position information, the current time information or current position information acquired by the time information / position information acquisition means, and the data storage means Data use permission / rejection to determine whether or not the current time information or current position information satisfies the available period or area of the data. As a result of the determination means and the data use permission determination means, if the current time has passed the available period, or the current position is out of the available area, the data And a data deleting means for deleting. According to this configuration, the data distribution server can accurately distribute data according to the period or area in which the data can be used, and thus can prevent unauthorized use of the data file.

  The delivery data management system according to claim 4 is the distribution data management system according to claim 3, wherein the time information / position information acquisition means always uses the GPS signal at the time of reproduction of the data to use the current time information or the current position information. When the mobile communication device is turned off, the current time information or the current position information is obtained when the power is turned on again. According to this configuration, the data distribution server can accurately distribute data according to the time elapsed at the time of reproduction of the data or the position moved at the time of reproduction. Data can be distributed, and thus a new service model can be provided.

  The distribution data management method according to claim 5 is a distribution data management method for managing various data distributed from a data distribution server to a data requesting device via a network. A data selection step of selecting the requested data from the data, and adding information on the period or area in which the data can be used to the data, and the data requesting device together with information on the period or area in which the data is available A data distribution step for distributing data, a data storage step for storing information related to the data distributed in the data distribution step and a usable period or area of the data in the data requesting device, and transmitted from a GPS satellite GPS signal is received and the GPS signal Time information / position information acquisition step for acquiring current time information or current position information included, the current time information or current position information acquired in the time information / position information acquisition step, and the data Whether the current time information or current location information satisfies the available period or area of the data is compared with the information on the available period or area of the data stored in the storage means In the data use permission determination step and the data use permission determination step for determining whether the current time has passed the available period, or the current position is out of the available area. A data deletion step of deleting the data. According to this configuration, the data distribution server can accurately distribute data according to the period or area in which the data can be used, and thus can prevent unauthorized use of the data file.

  As described above, according to the present invention, data management is performed based on accurate time information and position information, and it is possible to prevent a malicious user from changing information related to a period or area in which the data can be used. Yes, using time information transmitted from GPS satellites or position information based on positioning as a means of acquiring the current time or current position, and determining the period and area in which data can be used on mobile phones and in-vehicle audio devices As a result, it is possible to prevent the unauthorized use of data.

  In addition, it is possible to provide a data management function under a specific situation, and various data can be distributed, so that an effect of providing a new service model can be obtained. Note that the above specific situation refers to, for example, when it is necessary to provide information limited to a short time by management by time in music files, etc., or when it is necessary to provide information limited to a short time by management by time using map data, etc. In some cases, it is necessary to provide information limited to a specific area.

Hereinafter, embodiments of a distribution data management system of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
First, the distribution data management system according to the first embodiment of the present invention will be described in detail.
FIG. 1 is a block diagram showing the overall configuration of a distribution data management system according to the first embodiment of the present invention.
As shown in the figure, this system includes a mobile communication device 1 used in a mobile communication network, a data distribution company 2 that distributes data to the mobile communication device 1, time information and the like to the mobile communication device 1. GPS satellite 3 for providing

  The mobile communication device 1 includes all devices that can communicate while moving, such as mobile communication devices such as mobile phones and PHS, in-vehicle communication devices for automobiles, communication devices for ships, and communication devices for trains. An example of an in-vehicle communication device for automobiles is an in-vehicle audio device. The mobile communication device 1 is connected to the data distribution company 2 via a network (mobile communication network) 4 such as the Internet so as to be capable of bidirectional communication, and acquires its own time information using the GPS satellite 3. A GPS device is required to receive radio waves from the GPS satellite 3, which is a geostationary satellite. This GPS device is built in the mobile communication terminal 1 in this embodiment. In this way, the mobile communication terminal 1 acquires information on the current time by infrared communication or radio communication using radio waves.

  The data distribution company 2 has a data distribution server that distributes data, and distributes information to the mobile communication device 1 via the mobile communication network 4. This information includes various information such as music information, map information, news, traffic information, etc., which are directly provided by each music information provider, map information provider, news provider, traffic information provider, etc. It may also be a provider that collects and distributes these pieces of information.

A GPS (Global Positioning System) satellite 3 is a global positioning system, and is composed of a plurality of GPS satellites 3. Each GPS satellite 3 transmits an individual GPS signal. The mobile communication device 1 receives GPS signals transmitted from a predetermined number of GPS satellites 3, and acquires time information and the like by analyzing the GPS signals.
Inside the mobile communication device 1, a data receiving unit 11, a data storage unit 12, a GPS signal receiving unit 13, a time information acquisition unit 14, a data use permission / inhibition determination unit 15, and a data deletion unit 16 are arranged. The data distribution company 2 is provided with data selection means 21 and data distribution means 22.

  The data selection means 21 selects the data requested from the mobile communication device 1 from a database (not shown) stored in the data distribution company 2 or the like, and sets information related to the usable period of the data to the data. Append. The data distribution unit 22 distributes the data selected by the data selection unit 21 to the mobile communication device 1 together with information regarding a period during which the data can be used.

The data receiving unit 11 receives data from the data distribution unit 22 of the data distribution company 2. The data storage unit 12 temporarily stores the data received by the data reception unit 11 in a memory or the like. The GPS signal receiving unit 13 receives a GPS signal transmitted from a predetermined GPS satellite 3. The time information acquisition unit 14 analyzes the received GPS signal and acquires data such as time information. The data use permission / non-permission determination unit 15 includes a time period included in the time information from the GPS satellite 3 acquired by the time information acquisition unit 14 and the data from the data distribution company 2 stored in the data storage unit 12. It is determined whether the data distributed from the data distribution company 2 can be used temporally. The data deleting unit 16 deletes the data in the memory when the data use permission / non-permission determining unit 15 determines that the data cannot be used temporally.
The time information acquisition means 14 always acquires the current time information using the GPS signal when reproducing the data, and when the mobile communication device 1 is turned off, the time information acquisition means 14 It is preferable that the time information is acquired.

FIG. 2 is a flowchart showing the operation of the distribution data management system according to the first embodiment of the present invention.
First, the user uses the mobile communication device 1 to request data such as music or a map from the data distribution company 2 (step S21). Next, the data distribution company 2 uses the data selection means 21 to select the requested data from its own database or the like (step S22), and determines information regarding a period during which the data can be used and adds it to the data. (Step S23), the data selected using the data distribution means 22 and the information relating to the available period are distributed to the mobile communication device 1 (Step S24). The mobile communication device 1 receives data from the data distribution company 2 using the data receiving unit 11 (step S25) and stores it in the data storage unit 12 (step S26). Further, the mobile communication device 1 receives the GPS signal transmitted from the GPS satellite 3 using the GPS signal receiving unit 13 (step S27), analyzes the GPS signal using the time information acquisition unit 14, and acquires the time information. (Step S28). Next, the time information acquired from the GPS satellite 3 is compared with the information about the usable period distributed from the data distribution company 2 by using the data use permission / refusal determination means 15, and the current time is It is determined whether a usable period has elapsed (step S29), and after the period in which the current time is available, the data is deleted using the data deleting unit 16 (step S30). If the current time period has not passed, the process returns to step S25 to acquire time information from the GPS signal again. In step S29, the current time is again available for the data. It is determined whether or not the period has elapsed. In this way, the data in the memory is deleted sequentially.

FIG. 3 is a schematic diagram showing a method for managing available data using time information of GPS satellites in the distribution data management system according to the first embodiment of the present invention.
This method uses GPS satellites 3 to acquire time information in a mobile communication device such as a mobile phone or an in-vehicle audio device, and compares the obtained time information with information related to a period in which distribution data can be used. This is a method for determining whether or not the use can be permitted.

  As shown in the figure, first, data is transmitted to the data distribution company 2 via the mobile communication network 4 in order for the mobile communication device 1 such as a mobile phone or an in-vehicle communication device to distribute data from the data distribution company 2. After making the request (step S31), the data distribution company 2 selects the requested data, determines the period information available for the data, and then adds information about the period to the data (step S32). Then, the data including the information regarding the usable period is distributed to the mobile communication device 1 via the mobile communication network 4 (step S33). The mobile communication device 1 acquires the current time information using the GPS signal transmitted from the GPS satellite 3 (step S34), and is distributed from the current time information acquired from the GPS satellite 3 and the data distribution company 2. Compared with the information regarding the available period, and after the period when the current time is available, the data distributed and stored from the data distribution company 2 is deleted (step S35).

  As described above, the first embodiment compares the information about the usable period notified together with the data distributed through the mobile phone network with the current time information acquired by the mobile phone or the in-vehicle audio device by GPS or the like, In this method, the data is deleted from the memory when the time of the time exceeds the available period. This makes it possible to provide a data management function limited to a specific situation using time information acquired using GPS or the like, and prevent unauthorized use of data. Provision is possible.

[Second Embodiment]
Next, a distribution data management system according to the second embodiment of the present invention will be described.
FIG. 4 is a schematic diagram showing a method for managing available data using position information of GPS satellites in the distribution data management system according to the second embodiment of the present invention.
This method uses GPS satellite 3 to perform positioning in a mobile phone or an in-vehicle audio device, and compares the obtained location information with available area information of distribution data to determine whether or not data usage can be permitted. This is a method for determining whether or not.

  As shown in the figure, first, data is transmitted to the data distribution company 2 via the mobile communication network 4 in order for the mobile communication device 1 such as a mobile phone or an in-vehicle communication device to distribute data from the data distribution company 2. After making the request (step S41), the data distribution company 2 selects the requested data, determines available area information for the data, and then adds the area information to the data (step S42). Data including the usable area information is distributed to the mobile communication device 1 via the mobile communication network 4 (step S43). In the mobile communication device 1, the current position is acquired using the GPS signal transmitted from the GPS satellite 3 (step S44), and the current position information acquired from the GPS satellite 3 and the data distribution company 2 are distributed. Compared with the available area information, after the current position deviates from the available area information, the data distributed and stored by the data distribution company 2 is deleted (step S45).

  As described above, the second embodiment compares the available area information notified together with the data distributed through the mobile phone network with the current position information acquired by the mobile phone or the in-vehicle audio device by GPS or the like, This is a method of deleting data from the memory only when the position is out of the available area. As a result, it becomes possible to provide a data management function limited to a specific situation using position information acquired using GPS or the like, which can prevent unauthorized use of data and a new service model. Provision is possible.

[Third Embodiment]
Next, a distribution data management system according to the third embodiment of the present invention will be described.
FIG. 5 is a schematic diagram showing a management method of usable data using time information or position information of a GPS satellite in the distribution data management system according to the third embodiment of the present invention.
This method uses time information or position information transmitted from a GPS satellite 3 and acquires accurate time information or position information in a mobile communication device 1 such as a mobile phone or an in-vehicle audio device. 2 is a method of managing data distributed from the time 2 or position information.

  As shown in the figure, first, the mobile communication device 1 such as a mobile phone or an in-vehicle communication device receives data from the data distribution company 2 to the data distribution company 2 in order to receive data from the data distribution company 2. When making the request (step S51), the data distribution company 2 selects the requested data, adds information on the available period or area of the data to the data (step S52), and the available period or Data including information on the area is distributed to the mobile communication device 1 via the mobile communication network 4 (step S53). In the mobile communication device 1, the current time information or position information is acquired using the GPS signal transmitted from the GPS satellite 3 (step S54), and the current time information or position information acquired from the GPS satellite 3 and data The data delivery company after comparing the available period information or area information delivered from the delivery company 2 and after the current time has passed the available period, or after the current location is out of the available area The data distributed and stored from 2 is deleted (step S55).

  As described above, in the third embodiment, the available period information or area information notified together with the data distributed through the mobile phone network, and the current time information or position information acquired by the mobile phone or the in-vehicle audio device by the GPS, etc. And the data is deleted from the memory when the current time exceeds the available period or when the current position is out of the available area. As a result, it becomes possible to provide a data management function limited to a specific situation using time information or position information acquired using GPS or the like. A service model can be provided.

As described above, by applying the present invention, it becomes possible to accurately distribute data in units of periods or areas using time information or position information such as GPS, and prevent unauthorized use of data files. It is possible to provide a new service model in the management of distribution data.
In addition, in performing the process shown in FIG. 2, it is description about the case where the control program previously stored in ROM is performed, but it is not restricted to this, The memory | storage which recorded the program which showed these procedures The program may be executed from a medium by being incorporated in a RAM. Alternatively, the program may be acquired from a network.

  Here, the storage medium is a semiconductor storage medium such as RAM or ROM, a magnetic storage type storage medium such as FD or HD, an optical reading type storage medium such as CD, CDV, LD, or DVD, or a magnetic storage type such as MO. / Optical reading type storage media, including any storage media that can be read by a computer regardless of electronic, magnetic, optical, or other reading methods.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, A various change is possible without deviating from the meaning of this invention. For example, in the above-described embodiment, the GPS satellite 3 is used, and after the period in which the current time is available in the first embodiment has passed, the current position is out of the available area in the second embodiment. Later, after the period in which the current time is available in the third embodiment or after the current position is out of the available area, the data distributed and stored from the data distribution company 2 is deleted. However, the present invention is not limited to these embodiments, and the data distribution is performed after the period when the current time is available and the current position is out of the available area. The data distributed from the company 2 and stored can also be deleted.

In the above-described embodiment, the time information or the position information is acquired using the GPS satellite 3 that is the global positioning system. However, the present invention is not limited to this, and the time information is acquired using another positioning system. It can also be configured to obtain information or location information.
Further, in the above-described embodiment, the data distribution server 2 is configured to add information related to a period or area in which the data can be used after the data is selected and distribute the data, but the present invention is not limited thereto. Alternatively, information related to the period or area in which the data can be used can be listed together with information related to the period or area in which other data can be used, and the list can be distributed separately from the data.

In the above-described embodiment, the data is distributed according to the period or area information. However, the present invention is not limited to this, and other attributes, for example, information about the attributes of the user of the mobile communication device can be used. It can also be configured to be added as information on various attributes.
In the above-described embodiment, the data deleting unit 16 is configured to sequentially delete the data distributed and stored from the data distribution company 2 after the current time or position is out of the available period or area. However, the present invention is not limited to this, and it may be configured to move to another memory as an unnecessary memory and delete it after confirmation by the user.

It is a block diagram which shows the whole structure of the delivery data management system which concerns on 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the delivery data management system which concerns on 1st Embodiment of this invention. It is the schematic which shows the management method of the usable data using the time information of the GPS satellite in the delivery data management system which concerns on 1st Embodiment of this invention. It is the schematic which shows the management method of the usable data using the positional information on the GPS satellite in the delivery data management system which concerns on 2nd Embodiment of this invention. It is the schematic which shows the management method of the usable data using the time information or position information of a GPS satellite in the delivery data management system which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile communication apparatus, 2 ... Data distribution company, 3 ... GPS satellite, 4 ... Network, 11 ... Data receiving means, 12 ... Data storage means, 13 ... GPS signal receiving means, 14 ... Time information acquisition means, 15 ... Data Usage permission determination means, 16 ... data deletion means, 21 ... data selection means, 22 ... data distribution means

Claims (5)

In a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network,
The data distribution server selects data requested by the mobile communication device, adds data related to the data availability period to the data, and data selection means for the data availability period And a data distribution means for distributing to the mobile communication device,
The mobile communication device is
Data storage means for storing information related to the data distributed from the data distribution means and a period in which the data can be used;
Time information acquisition means for receiving a GPS signal transmitted from a GPS satellite and acquiring current time information included in the GPS signal;
The current time information acquired by the time information acquisition unit is compared with information related to an available period of the data stored in the data storage unit, and the current time information can be used for the data. Data use permission determination means for determining whether or not a certain period is satisfied,
As a result of the data use permission determination means, when the current time has passed the available period, a data deletion means for deleting the data;
A distribution data management system comprising: In a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network,
The data distribution server selects data requested by the mobile communication device, adds data regarding an area where the data can be used to the data, and information regarding the area where the data can be used. And a data distribution means for distributing to the mobile communication device,
The mobile communication device is
Data storage means for storing information related to the data distributed from the data distribution means and an area where the data can be used;
Position information acquisition means for acquiring current position information using a GPS satellite;
The current position information acquired by the position information acquisition unit is compared with information on the available area of the data stored in the data storage unit, and the current position information can be used for the data. Data use permission determination means for determining whether or not a certain area is satisfied,
As a result of the data use permission determination means, when the current position is out of the available area, data deletion means for deleting the data;
A distribution data management system comprising: In a distribution data management system for managing various data distributed from a data distribution server to a mobile communication device via a network,
The data distribution server selects data requested from a mobile communication device, adds data selection period or area information related to the data to the data, and data usage period. Or a data distribution means for distributing to the mobile communication device together with information about the area,
The mobile communication device is
Data storage means for storing information related to the data distributed from the data distribution means and a usable period or area of the data;
Time information / position information acquisition means for receiving a GPS signal transmitted from a GPS satellite and acquiring current time information or current position information included in the GPS signal;
The current time information or current position information acquired by the time information / position information acquisition means is compared with information relating to an available period or area of the data stored in the data storage means, and the current information Data use permission determination means for determining whether the time information or the current position information of the data satisfies a usable period or area of the data;
Data that deletes the data when the current time has passed the available period, or when the current position is out of the available area, as a result of the data use permission determination unit Delete means,
A distribution data management system comprising:   The time information / location information acquisition means always acquires the current time information or the current location information using a GPS signal at the time of reproducing the data, and when the mobile communication device is turned off, 4. The distribution data management system according to claim 3, wherein the current time information or the current position information is acquired when the power is turned on. In a distribution data management method for managing various data distributed from a data distribution server to a data requesting device via a network,
In the data distribution server, a data selection step of selecting data requested from a data requesting device, and adding information related to a usable period or area of the data to the data;
A data distribution step of distributing the data to the data requesting device together with information on a period or area in which the data can be used;
In the data requesting device, a data storage step of storing information related to the data distributed in the data distribution step and an available period or area of the data;
A time information / position information acquisition step of receiving a GPS signal transmitted from a GPS satellite and acquiring current time information or current position information included in the GPS signal;
The current time information or current position information acquired in the time information / position information acquisition step is compared with information relating to an available period or area of the data stored in the data storage means, and the current A data use permission determination step for determining whether or not the time information or the current position information satisfies a usable period or area of the data;
In the data use permission / inhibition determination step, if the current time has passed the usable period, or if the current position is out of the usable area, data deletion is performed to delete the data. Steps,
A delivery data management method comprising:

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