JP5299835B2 - Electronic information display program, electronic information management program, electronic information display device, electronic information management device, and electronic information management system - Google Patents

Description

  The present invention relates to an electronic information display program, an electronic information management program, an electronic information display device, an electronic information management device, and an electronic information management system.

  When the electronic information managed by the server is displayed on the client terminal, the client terminal may acquire the electronic information from the server and display the acquired electronic information using a viewer such as an installed web browser. In this case, electronic information may remain in the client terminal and the remaining electronic information may be used illegally.

For such a problem, for example, when the client terminal acquires the electronic information from the server, the electronic information is encrypted so that the acquired electronic information can be used only in the client terminal that can be decrypted. Countermeasures have been taken by methods (for example, Patent Document 1 and Patent Document 2).
JP 2003-256596 A JP 2004-102788 A

  The present invention provides an electronic information display program that suppresses unauthorized use of electronic information remaining in a client terminal without using a technique for decoding the electronic information when displaying the electronic information acquired by the client terminal, An object is to provide an electronic information management program, an electronic information display device, an electronic information management device, and an electronic information management system.

In order to achieve the above object, the electronic information display program according to the first aspect of the present invention is the electronic information generated in the request destination by requesting the computer to download the electronic information, wherein the electronic information is converted into a download format. Provisional information including electronic information after format conversion, information on opening of the electronic information after format conversion, and an expiration date for which use of the electronic information after format conversion is permitted is received from the request destination and temporarily received Temporary storage means for storing; first determination means for determining the reliability of the date and time indicated by the clock unit; setting means for setting whether or not to determine the reliability of the date and time by the first determination means; when displaying the format converted electronic information included in the provided information stored in the storage means on the display device, it included in the provided information Together with the format converted electronic information included in the provided information to determine whether it may have been opened on the basis of information on the open setting be performed and the reliability of determination of the time by the setting unit If the date and time indicated by the clock unit is determined to be reliable by the first determining means, the expiration date included in the provided information and the date and time indicated by the clock unit are determined. second determining means for determining whether it is within the valid period not the use of the format converted electronic information included in the provided information is permitted, the format converted electronic information to be displayed by said second determination means If but it is determined that and have never been opened, is within the valid period of use of the format converted electronic information to be displayed is allowed , Open electronic information after the format conversion generates display information corresponding to the format conversion after electronic information, to have been opened the information about open included in the provided information including the electronic information after the format conversion It is set to indicate that it is present, and operates to function as display information output means for outputting the display information to the display device .

The invention according to claim 2 is the electronic device according to claim 1, wherein when the computer determines that the post-format conversion electronic information to be displayed is opened by the second determination means, the post-format conversion electronic It operates to further function as a deletion processing means for deleting information.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the display information output means is within an expiration date during which use of the post-format conversion electronic information to be displayed is permitted by the second determination means. If it is not determined, the display information corresponding to the information indicating the storage location of the post-format conversion electronic information included in the provided information including the post-format conversion electronic information is created, and the display information is displayed in the display Output to the device.

According to a fourth aspect of the present invention, there is provided an electronic information display device according to a fourth aspect of the present invention , wherein electronic information after format conversion in which the electronic information is converted into a download format, which is generated at a request destination by requesting download of electronic information Temporary storage means for receiving provisional information including information related to opening of electronic information after format conversion and an expiration date for permitting use of the electronic information after format conversion from the request destination, and a watch Stored in the temporary storage means, first setting means for determining the reliability of the date and time indicated by the unit, setting means for setting whether or not to determine the reliability of the date and time by the first determination means When displaying the electronic information after the format conversion included in the provided information on a display device, based on the information related to the opening included in the provided information It is determined whether or not the format-converted electronic information included in the provided information has been opened, and when the setting means is configured to determine the reliability of the date and time, The format included in the provision information based on the expiration date included in the provision information and the date and time indicated by the clock section when the determination section determines that the date and time indicated by the clock section is reliable. A second determination means for determining whether or not the use of the electronic information after conversion is within an allowed expiration date; and the format-converted electronic information to be displayed is opened by the second determination means. And if it is determined that the format-converted electronic information to be displayed is within the validity period permitted to be used, the post-format-converted electronic information Open to create display information corresponding to the electronic information after the format conversion, and set the information related to the opening included in the provision information including the electronic information after the format conversion to indicate that the information has been opened. And display information output means for outputting the display information to the display device.

The invention of the electronic information management system according to claim 5 is an electronic information management system comprising an electronic information management device and an electronic information display device, wherein the electronic information management device comprises storage means for storing electronic information; Receiving means for receiving a download request for requesting downloading of the electronic information stored in the storage means from the electronic information utilization apparatus; and the electronic information corresponding to the download request received by the receiving means is for download The provision information including the post-format conversion electronic information converted into the format, the information on the opening of the post-format conversion electronic information, and the expiration date in which the use of the post-format conversion electronic information is permitted is created, and the provision Show that you have never opened the information about the opening when creating the information Provision information creation means for setting to the electronic information utilization apparatus in response to the download request received by the reception means, and transmission means for transmitting the provision information created by the provision information creation means The electronic information display device includes: a temporary storage unit that temporarily stores the provision information created by the provision information creation unit; a first determination unit that determines the reliability of the date and time indicated by the clock unit; Setting means for setting whether or not to determine reliability of the date and time by the first determination means, and displaying the electronic information after format conversion included in the provision information stored in the temporary storage means on the display device When the format-converted electronic information included in the provided information is opened based on the information related to opening included in the provided information. If the setting means is configured to determine the reliability of the date and time, the date and time indicated by the clock unit is determined to be reliable by the first determination means. If it is determined, whether or not the expiration date included in the provision information and the date and time indicated by the clock unit are within the validity period permitted to use the electronic information after format conversion included in the provision information. The second determination means for determining whether the electronic information after the format conversion to be displayed has not been opened by the second determination means, and the use of the electronic information after the format conversion to be displayed is permitted. If it is determined that it is within the valid period, the electronic information after format conversion is opened, display information corresponding to the electronic information after format conversion is created, Display information output means for setting the information regarding the opening included in the provided information including the electronic information after the format conversion to indicate that the information has been opened, and outputting the display information to the display device To do.

  According to the first aspect of the present invention, when the electronic information acquired by the client terminal is displayed, unauthorized use of the electronic information remaining in the client terminal can be suppressed without using a technique for decrypting the electronic information.

Further, when it is not determined that the date and time indicated by the clock unit is reliable, unauthorized use of electronic information can be suppressed.

According to the invention of claim 2 , when it is determined that the electronic information is opened, the electronic information can be automatically deleted.

According to the invention of claim 3 , when it is not determined that the use of electronic information is within the permitted expiration date, the user obtains the electronic information again as compared with the case without this configuration. Convenience to improve.

According to the fourth aspect of the present invention, when the electronic information acquired by the client terminal is displayed, unauthorized use of the electronic information remaining in the client terminal can be suppressed without using a technique for decoding the electronic information.

According to the fifth aspect of the present invention, when the electronic information acquired by the client terminal is displayed, unauthorized use of the electronic information remaining in the client terminal can be suppressed without using a technique for decoding the electronic information.

  Embodiments of an electronic information display program, an electronic information management program, an electronic information display device, an electronic information management device, and an electronic information management system according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing an example of the overall configuration of an electronic information management system (hereinafter referred to as a content management system) according to an embodiment of the present invention.

  A server 20 and a plurality of client terminals 10 are connected to the content management system via a network 30 constituted by communication means such as a LAN (Local Area Network) or a WAN (Wide Area Network). The configuration illustrated here is merely an example, and for example, a configuration in which a plurality of servers 20 are connected may be used, or a configuration in which only one client terminal 10 is connected may be used. The server 20 and the client terminal 10 may be connected by a communication means such as a dedicated line.

  The client terminal 10 functions to use content (electronic information including document information, image information, audio information, moving image information, etc.) and various services. In this embodiment, in particular, the content managed by the server 20 is used. It plays a role as a content using device. Each client terminal 10 is installed with a viewer 12 for browsing the content managed by the server 20, and the client terminal 10 uses the viewer 12 to browse the content managed by the server 20. To do. The viewer 12 is realized by a Web browser or the like, for example.

  The server 20 has a function of responding to a request source with contents and execution results of various processes in response to a request (request). In the present embodiment, in particular, the server 20 manages various contents and responds to requests from the client terminal 10. It plays the role of a content management device that provides these contents. When providing the content, the server 20 converts the content into the download format shown in the example of FIG. The download format includes, for example, a print prohibition flag indicating whether printing is prohibited, a transfer prohibition flag indicating whether posting is prohibited, an open presence flag indicating whether opened, or the use of content is permitted. It is composed of an effective period indicating a period, a content source (URI) indicating the storage location of the original content, content information indicating the contents of the actual content, and the like. Here, a case where a period (including a start time, an end time limit, etc.) is set as the effective period in the present embodiment will be described. However, the method of setting the effective period is not limited to this, for example, the time limit (end A period including only a time limit) may be set as the effective period. Note that opening the content means that the device that operates the content designates the content to be operated, and the opened state is canceled by closing.

  Here, in order to make the explanation of the content management system in the present embodiment easy to understand, an example of a processing flow when browsing the content managed by the server 20 will be briefly described with reference to FIG.

  Assume that a download request is transmitted from the client terminal 10 to the server 20 via the viewer 12. In response to this, the server 20 creates download content based on the requested content (format conversion or the like), and responds to the client terminal 10 with the converted content.

  The client terminal 10 stores the downloaded content in the temporary storage area. The viewer 12 displays the content by opening the content stored in the temporary storage area. The downloaded content may be displayed upon completion of the download, or may not be displayed immediately after the download, but may be displayed only when an instruction is given to open the content saved in the temporary storage area. .

  After downloading, when opening of the content stored in the temporary storage area is instructed based on an instruction from the user or the like, the viewer 12 determines whether the content can be opened. This determination is made based on reference to the open / non-open flag, the valid period, etc. in the download format described above. Specifically, if the content has never been opened and if the elapsed time after downloading is within the valid period, the content will be opened and displayed on the screen. If it is determined that the content has been opened, or if the validity period has passed even if it has not been determined that the content has been opened, the content is refused to be opened and a message indicating that the content cannot be opened is displayed on the screen. Become.

  The above is an explanation of an example of the overall configuration of the content management system according to the present invention. The client terminal 10 and the server 20 described above include a CPU (Central Processing Unit) as a main control unit, a ROM (Read Only Memory) as a storage unit, a RAM (Random Access Memory), an HDD (Hard Disk Drive). ), Etc., such as a keyboard, a mouse, and a display as input / output means, and a network card as a communication means are connected by a bus. Each of these constituent means is controlled by executing a program stored in the storage means by the main control means.

  Next, an example of a functional configuration of the client terminal 10 and the server 20 illustrated in FIG. 1 will be described with reference to FIG.

  First, the client terminal 10 will be described. The client terminal 10 includes a temporary data storage unit 11 and a viewer 12. The temporary data storage unit 11 is a storage area in which data including content downloaded by the viewer 12 is temporarily stored, and the viewer 12 is an application for browsing content and the like. When displaying content in the viewer 12, the content is temporarily stored in the temporary data storage unit 11, and the content stored therein is opened. The contents opened on the viewer 12 can be browsed, and can be printed and saved.

  Here, the viewer 12 has, as its functional configuration, an internal clock determination unit 13, a validity period determination unit 14, an open presence determination unit 15, an opened flag recording processing unit 16, and an opened content deletion processing unit 17. And a display control unit 18.

  The internal clock determination unit 13 functions to determine the reliability of the internal clock in the client terminal 10. For example, NTP (Network Time Protocol) may be used to determine the reliability of the internal clock.

  The validity period determination unit 14 functions to determine whether or not the content to be opened is within the validity period. That is, the valid period in the download format is compared with the client internal clock, and it is determined whether or not the elapsed time after the download is within the valid period.

  The open / non-open determination unit 15 determines whether or not the content to be opened has already been opened. This determination is made based on the reference of the open / non-open flag in the download format.

  The opened flag recording processing unit 16 has a function of recording in the content when the content is opened. That is, along with the content open, the open / not-open flag in the download format is set to open.

  The opened content deletion processing unit 17 has a function of deleting the content stored in the temporary data storage unit 11 after the content is opened.

  The display control unit 18 has a function of controlling display of content to be opened on the viewer 12. In the display control by the display control unit 18, for example, display information is created based on content information in the download format and displayed on a display. Note that the display control unit 18 also performs display control of a message indicating that it cannot be opened.

  Next, the server 20 will be described. The server 20 includes a content storage unit 21, a provision content creation unit 22, and a content management unit 23 as its functional configuration.

  The content storage unit 21 functions to store content. Here, the original content is stored. The content storage unit 21 may be realized on a separate device from the server 20.

  The provided content creation unit 22 performs the function of creating download content, and converts the format of the content into a download format (see FIG. 2), and various types of information (for example, whether open or not) A usage information setting unit 22b for setting a flag, a valid period, and the like. Note that the download content may be created when a download request is made, or may be made when the original content is stored in the content storage unit 21, and the timing is not particularly limited. Absent.

  The content management unit 23 has a function of performing overall management of content stored in the content storage unit 21. For example, the content after format conversion is transmitted to the request source based on a download request from the viewer 12, or access is denied in some cases.

  The above is the description of the client terminal 10 and the server 20. Next, an example of the operation at the client end 10 and the server 20 will be described with reference to FIGS.

  First, an example of an operation flow in the server 20 will be described with reference to FIG.

  The server 20 is waiting to receive a download request (NO in step S101). Here, when a download request is sent from the client terminal 10 (YES in step S101), the server 20 receives the request at the content management unit 23 and at the format conversion unit 22a the requested content. The format is converted (step S102), and the usage information setting unit 22b sets an open / non-open flag (no open), a valid period, and the like for the converted content (step S103).

  After this conversion, the server 20 transmits the converted content to the download request transmission source client terminal 10 in the content management unit 23 (step S104), and ends this processing.

  Next, an example of the operation flow in the client terminal 10 will be described using two patterns with reference to FIGS. In FIGS. 6 and 7, it is assumed that the content after format conversion downloaded from the server 10 is already stored in the temporary storage area (temporary data storage unit 11) in the client terminal 10.

  First, an example of the first operation flow in the client terminal 10 will be described with reference to FIG.

  When the viewer 12 is activated in the client terminal 10 and the display of the content stored in the temporary data storage unit 11 is instructed, the viewer 12 confirms that the content has been opened even once in the open presence / absence determination unit 15. It is determined whether or not there is (step S201). As described above, this determination is made based on the reference to the open / non-open flag in the download format.

  As a result, if it is determined that the file has been opened (YES in step S202), the display control unit 18 creates display information indicating that the file cannot be opened and displays it (step S205), and then ends this process. However, if it is determined that it has not been opened (NO in step S202), the effective period determination unit 14 determines whether it is within the effective period (step S203). Specifically, the effective period in the content is referred to, and it is determined whether or not the elapsed time after downloading the content is within the effective period. As described above, this determination is made based on a comparison between the valid period in the download format and the client internal clock.

  Here, if it is determined that the valid period has passed (NO in step S204), the display control unit 18 creates display information indicating that it cannot be opened and displays it (step S205). If it is determined that it is within the valid period (YES in step S204), the display control unit 18 opens the content (step S206), and the display information based on the content Is created and displayed on the screen (step S206). At this time, the open flag recording processing unit 16 writes and records information indicating that the content has been opened (opened) (step S208). That is, “open” is set in the open / non-open flag in the content. Then, this process ends.

  Subsequently, an example of the flow of the second operation in the client terminal 10 will be described with reference to FIG.

  When the viewer 12 is activated in the client terminal 10 and the display of the content stored in the temporary data storage unit 11 is instructed, the viewer 12 confirms that the content has been opened even once in the open presence / absence determination unit 15. It is determined whether or not there is (step S301). As described above, this determination is made based on the reference to the open / non-open flag in the download format.

  As a result, if it is determined that the file has been opened (YES in step S302), the display control unit 18 creates display information indicating that the file cannot be opened and displays it (step S307), and then ends this process. However, when it is determined that it has not been opened (NO in step S302), the internal clock determination unit 13 verifies the reliability of the internal clock (step S303). This is performed in order to prevent the content valid period from being unduly lengthened by disguising the internal clock.

  As a result of the verification, if it is determined that the internal clock is not reliable (NO in step S304), the display control unit 18 creates display information indicating that the internal clock cannot be opened and displays it (step S307). This process ends, but if it is determined that the internal clock is reliable (YES in step S304), then the validity period determination unit 14 determines the elapsed time after the content download. (Step S305). Specifically, the effective period in the content is referred to, and it is determined whether or not the elapsed time after downloading the content is within the effective period. As described above, this determination is made based on a comparison between the valid period in the download format and the client internal clock.

  Here, if it is determined that the valid period has passed (NO in step S306), the display control unit 18 creates display information indicating that it cannot be opened and displays it (step S307). If it is determined that it is within the valid period (YES in step S306), the display control unit 18 opens the content (step S308), and the display information based on the content Is created and displayed on the screen (step S309). At this time, the open flag recording processing unit 16 writes and records information indicating that the content has been opened (opened) (step S309). That is, “open” is set in the open / non-open flag in the content. Then, this process ends.

  Note that the operation of the client terminal 10 has been described with reference to FIG. 6 and FIG. 7 with an example of two patterns, but which of these operations is taken can be adjusted based on the operation setting in the client terminal 10. .

  In the description of FIG. 6 and FIG. 7 described above, the open flag is recorded after the content is opened (steps S207 and S309). Instead of this process, the open content deletion processing unit 17 is used. The content that has been opened once may be deleted.

  Further, in the description of FIG. 6 and FIG. 7 described above, when the content open is not allowed, it is a process of displaying that it cannot be opened and ending (step S205 and step S307). The processing may be terminated after displaying the URI indicating the original content storage location. This process can be realized, for example, by creating display information based on the content source (URI) in the download format shown in FIG. 2 and displaying it.

  Although the above is an example of typical embodiment of this invention, this invention is not limited to the Example shown to the said and drawing, It can implement suitably deform | transforming within the range which does not change the summary. .

  For example, in the above embodiment, after determining whether or not the content has been opened, it is determined whether or not the content is within the valid period. However, the order of this processing can be changed as appropriate. For example, it may be determined whether it is within the valid period first.

  The programs operating on the client terminal 10 and the server 20 described above can be provided by being recorded on an external recording medium such as a CD-ROM as well as provided by communication means such as a network.

It is a figure which shows an example of the whole structure of the content management system concerning one Embodiment of this invention. It is a figure which shows an example of a download format. It is a figure which shows the outline | summary of an example of operation | movement in the content management system shown in FIG. 2 is a diagram illustrating an example of a functional configuration that configures a client terminal 10 and a server 20. FIG. 4 is a flowchart illustrating an example of an operation flow in the server 20. 4 is a flowchart illustrating an example of a first operation flow in the client terminal 10. 4 is a flowchart illustrating an example of a flow of a second operation in the client terminal 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Client terminal 11 Temporary data storage part 12 Viewer 13 Internal clock judgment part 14 Effective period judgment part 15 Opening presence / absence judgment part 16 Opened flag recording processing part 17 Opened content deletion processing part 18 Display control part 20 Server 21 Content storage part 22 Provided content creation unit 22a Format conversion unit 22b Usage information setting unit 23 Content management unit

Claims (5)

Computer
The electronic information after the format conversion in which the electronic information is converted into a download format, the information on the opening of the electronic information after the format conversion, and the format conversion generated at the request destination by requesting the download of the electronic information Temporary storage means for receiving provisional information including an expiration date during which post-electronic information is permitted to be received from the request destination and temporarily stored;
First determination means for determining the reliability of the date and time indicated by the clock unit;
Setting means for setting whether or not to determine reliability of the date and time by the first determination means;
When displaying the format converted electronic information included in the provided information stored in the temporary storage unit on a display device, the format conversion included in the provided information based on the information on the open included in the provided information It is determined whether or not post- electronic information has been opened, and when the setting means is configured to determine the reliability of the date and time, the first determination means causes the clock unit to When it is determined that the date and time indicated are reliable , use of the electronic information after format conversion included in the provided information is permitted based on the expiration date included in the provided information and the date and time indicated by the clock unit. Second determination means for determining whether or not the expiration date
When it is determined by the second determination means that the post-format conversion electronic information to be displayed has not been opened and the use of the post-format conversion electronic information to be displayed is within the valid period The electronic information after the format conversion is opened, display information corresponding to the electronic information after the format conversion is created, and the information related to the opening included in the provision information including the electronic information after the format conversion is opened. An electronic information display program which is set so as to indicate that it is present and functions as display information output means for outputting the display information to the display device. The computer,
Deletion processing means for deleting the post-format conversion electronic information when it is determined by the second determination means that the post-format conversion electronic information to be displayed has been opened
The electronic information display program according to claim 1 for further functioning as: The display information output means includes
The format included in the provided information including the post-format conversion electronic information when the second determination means does not determine that the format-converted electronic information to be displayed is within the validity period permitted to be used The electronic information display program according to claim 1 , wherein display information corresponding to information indicating a storage location of the electronic information after conversion is created, and the display information is output to the display device . The electronic information after the format conversion in which the electronic information is converted into a download format, the information on the opening of the electronic information after the format conversion, and the format conversion generated at the request destination by requesting the download of the electronic information Temporary storage means for receiving provisional information including an expiration date during which post-electronic information is allowed to be received from the request destination and temporarily stored;
First judging means for judging the reliability of the date and time indicated by the clock part;
Setting means for setting whether or not to perform reliability determination of the date and time by the first determination means;
When displaying the electronic information after format conversion included in the provision information stored in the temporary storage means on a display device, the format conversion included in the provision information based on the information regarding the opening included in the provision information It is determined whether or not post-electronic information has been opened, and when the setting means is configured to determine the reliability of the date and time, the first determination means causes the clock unit to When it is determined that the date and time indicated are reliable, use of the electronic information after format conversion included in the provided information is permitted based on the expiration date included in the provided information and the date and time indicated by the clock unit. Second judging means for judging whether or not it is within the expiration date;
When it is determined by the second determination means that the post-format conversion electronic information to be displayed has not been opened and the use of the post-format conversion electronic information to be displayed is within the valid period The electronic information after the format conversion is opened, display information corresponding to the electronic information after the format conversion is created, and the information related to the opening included in the provision information including the electronic information after the format conversion is opened. Display information output means for setting to indicate that the display information is output to the display device;
An electronic information display device comprising: An electronic information management system comprising an electronic information management device and an electronic information display device,
The electronic information management device includes:
Storage means for storing electronic information;
Receiving means for receiving a download request for requesting downloading of the electronic information stored in the storage means from the electronic information utilization device;
In response to the download request received by the receiving means, the electronic information after format conversion in which the electronic information is converted into a format for download, information on opening of the electronic information after format conversion, and the electronic after format conversion Providing information including an expiration date during which use of the information is permitted, and providing information creating means configured to indicate that the information regarding the opening has never been opened when creating the providing information;
Transmission means for transmitting the provision information created by the provision information creation means to the electronic information utilization apparatus in response to the download request received by the reception means;
Comprising
The electronic information display device
Temporary storage means for temporarily storing the provision information created by the provision information creation means;
First judging means for judging the reliability of the date and time indicated by the clock part;
Setting means for setting whether or not to perform reliability determination of the date and time by the first determination means;
When displaying the electronic information after format conversion included in the provision information stored in the temporary storage means on a display device, the format conversion included in the provision information based on the information regarding the opening included in the provision information It is determined whether or not post-electronic information has been opened, and when the setting means is configured to determine the reliability of the date and time, the first determination means causes the clock unit to When it is determined that the date and time indicated are reliable, use of the electronic information after format conversion included in the provided information is permitted based on the expiration date included in the provided information and the date and time indicated by the clock unit. Second judging means for judging whether or not it is within the expiration date;
When it is determined by the second determination means that the post-format conversion electronic information to be displayed has not been opened and the use of the post-format conversion electronic information to be displayed is within the valid period The electronic information after the format conversion is opened, display information corresponding to the electronic information after the format conversion is created, and the information related to the opening included in the provision information including the electronic information after the format conversion is opened. Display information output means for setting to indicate that the display information is output to the display device;
An electronic information management system comprising:

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