JP2002312714A - Electronic document management system, electronic document management method and program for managing electronic document - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely judge the authenticity of a seal put on an electronic document. SOLUTION: The document management method comprises a step (S202) for reading the electronic document received through a network, a step (S204) for reading a seal management database, steps (S206 and S208) for retrieving a seal object which can be recognized by a user and a tally seal object which can not be recognized by the user added to the electronic document on the basis of the data of the seal management database, a step (S216) for judging that the seal is diverted when the seal object is detected and the tally seal object cannot be detected (YES in S210 and NO in S212) and a step (S220) for judging that the seal is eliminated when the seal object can not be detected and the tally seal object is detected (NO in S210 and YES S214).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for managing an electronic document, and more particularly, to a device in which a plurality of terminals are connected by a network, and electronically imprints imprint image data on an electronic document created in the terminal. The present invention also relates to an electronic document management system that transmits and receives this electronic document over a network to perform document circulation processing and approval processing.

[0002]

2. Description of the Related Art Recently, with the spread of an in-house network,
Settlement processing of electronic documents and document circulation processing in the company,
This is done by electronically imprinting an imprint image on the electronic document. When such processing is performed, it is necessary to increase security against deletion and plagiarism of the imprint image imprinted on the electronic document by a third party.

Japanese Patent Application Laid-Open No. H11-220610 discloses a security system that manages authentication by imprinting with electronic data. This security system includes an input circuit for inputting user information, a storage circuit for storing imprint data for each user, a readout circuit for reading imprint data from the storage circuit, and an imprint of the imprint read based on the encryption information. And an output circuit for embedding and outputting a garbage-like image near the inside of the frame.

[0004] The storage circuit stores data representing a seal used by the user. The user inputs a user's personal ID (identification) and password to the input circuit. The output circuit reads the imprint data corresponding to the personal ID stored in the storage circuit using the personal ID as a key,
The encryption information is embedded in the read imprint data. The output circuit, for example, divides the outer frame of the seal imprint into four equal parts, and
A garbage-like image is added to the position inside the circle frame of, and corresponding to the date and time stamped.

According to this system, a seal is read, and data representing a seal used by the user is read based on the input user information. A garbage image is embedded at a predetermined position inside the read imprint frame. This makes it possible to clearly discriminate whether the imprint is genuine or fake, for example, by printing the imprint on paper and examining it with eyeglasses. As a result, even if a malicious person steals the imprint data, since the stolen imprint data does not have a dusty image, it can be detected that the imprint is improper.

[0006]

However, according to this system, when the garbage image added by the output means is imitated, the approval operation can be performed using the stolen imprint data.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an electronic document management system, an electronic document management method, and an electronic document which prevent deletion and plagiarism of an imprint imprinted electronically are provided. It is to provide a program for management.

[0008]

An electronic document management system according to a first invention is a system for managing an electronic document based on the authenticity of imprint data added to the electronic document.
The electronic document management system includes: a document storage unit for storing the electronic document; an imprint data storage unit for storing imprint data representing an imprint that is electronically imprinted on the electronic document; Identification data storage means for storing identification data; connected to the document storage means and the imprint data storage means; added means for adding the imprint data to the electronic document; connected to the addition means and the identification data storage means When the imprint data is added to the electronic document,
Identification data adding means for adding identification data corresponding to the added imprint data to the electronic document. In the electronic document to which the identification data is added, the identification data is output in a form that cannot be recognized by a person. The electronic document management system further includes extraction means for extracting imprint data and identification data from the electronic document, and is connected to the extraction means, and determines whether the imprint data is authentic based on the extraction result by the extraction means. Determination means. Here, the imprint data is
Includes data representing seals, signatures, etc.

According to the first aspect of the invention, the imprint data storage means stores imprint data representing an imprint that is electronically imprinted on the electronic document, and the identification data storage means stores identification data associated with the imprint data. , Respectively. When the imprint data is added to the electronic document by the adding means, the identification data corresponding to the added imprint data is added by the identification data adding means. In an electronic document to which imprint data and identification data are added, since the identification data is output in a form that cannot be recognized by a person, a person can recognize character information and imprint data included in the electronic document but cannot recognize the identification data. . When such electronic documents are circulated,
The extracting means of the circulation destination electronic document management system extracts imprint data and identification data from the electronic document. For example, when the seal imprint data and the identification data can be extracted from the electronic document, the judging means judges that the seal imprint data is correct. Because the identification data does not exist even if the imprint data is stolen, the identification data remains even after the imprint data is deleted, and the existence and remaining of the identification data cannot be recognized by a person who has committed an illegal act. Unauthorized processing can be detected. Thus, the authenticity of the imprint data can be determined using the identification data that cannot be recognized by a person. As a result, it is possible to provide an electronic document management system that prevents deletion and plagiarism of a seal imprinted electronically.

[0010] In the electronic document management system according to a second aspect of the present invention, in addition to the configuration of the first aspect, the identification data adding means includes an identification data adding unit configured to identify the position where the imprint data is added and a position satisfying a predetermined relationship. Including means for adding data.

According to the second aspect, since the identification data is added to a position in the electronic document that satisfies a predetermined relationship with the position where the imprint data is added, the identification data can be easily extracted. can do.

According to a third aspect of the present invention, in the electronic document management system according to the first or second aspect, the identification data outputs an object using the same color as the background color of the electronic document in the electronic document. This is the data for

According to the third aspect, the identification data added to the electronic document by the identification data adding means outputs an object in the electronic document using the same color as the background color of the electronic document. Thus, a person cannot recognize the identification data.

The electronic document management system according to a fourth aspect of the present invention is the electronic document management system according to any one of the first to third aspects, wherein the judging means extracts the imprint data by the extracting means and outputs the identification data. When extracted, it includes means for determining whether the imprint data is true or false.

According to the fourth invention, from among the electronic documents,
When the imprint data and the identification data can be extracted, the imprint data is determined to be correct.

In an electronic document management system according to a fifth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the judging means extracts the imprint data and extracts the identification data by the extracting means. A means for determining whether the imprint data is true or false when the data is not extracted or when the identification data is extracted and the imprint data is not extracted is included.

According to the fifth aspect, if the identification data is not extracted even when the seal imprint data is extracted, or if the seal imprint data is not extracted even if the identification data is extracted, it is determined that the seal imprint data is incorrect.

An electronic document management system according to a sixth aspect of the present invention is the electronic document management system according to the first aspect, wherein the electronic document management system stores the feature amount of the imprint data in association with the imprint data stored in the imprint data storage means. The image processing apparatus further includes a feature amount storage unit and a calculation unit connected to the extraction unit for calculating a feature amount of the seal imprint extracted from the electronic document. The judging means includes: first judging means for judging the authenticity of the imprint data based on the result of the extraction of the imprint data and the identification data by the extracting means; and the imprint data extracted by the extracting means from the feature amount storage means. A second determining means for determining the authenticity of the imprint data based on the characteristic amount calculated by the calculating means and the read characteristic amount; And means for judging the authenticity of the imprint data based on the judgment result of the judgment means and the judgment result of the second judgment means.

According to the sixth aspect, the feature amount storage means includes:
The feature amount of the imprint data (for example, coordinate data representing the position of the center of gravity of the imprint) is stored. For example, when the seal imprint data and the identification data can be extracted from the electronic document, the first judging means judges that the seal imprint data is correct. The second judging means judges that the imprint data is correct when the characteristic amount of the imprint data read from the characteristic amount storage means matches the characteristic amount of the imprint added to the electronic document calculated by the calculating means. I do. The first determining means and the second determining means are:
When determining that the imprint data is correct, the determining unit determines that the imprint data is correct. This allows
The authenticity of the imprint data can be determined using the feature amount of the imprint and identification data that cannot be recognized by a person. As a result, it is possible to provide an electronic document management system that prevents deletion and plagiarism of a seal imprinted electronically.

An electronic document management system according to a seventh aspect of the present invention is the electronic document management system according to the sixth aspect of the present invention, wherein the characteristic amount storage means stores the identification data added to the electronic document when the imprint data is added to the electronic document Means for storing the feature amounts in association with each other is included. The second judging means reads out the characteristic amount stored corresponding to the identification data extracted by the extracting means from the characteristic amount storing means, and based on the characteristic amount calculated by the calculating means and the read characteristic amount. Means for determining the authenticity of the imprint data.

According to the seventh invention, the second determining means is:
Corresponding to the extracted identification data, if the feature amount stored in the feature amount storage unit matches the feature amount of the imprint added to the electronic document calculated by the calculation unit, the imprint data is determined to be correct. to decide.

An electronic document management system according to an eighth aspect of the present invention is a system in which, in addition to the configuration of the sixth or seventh aspect, the characteristic amount of the imprint data is encrypted and stored.

According to the eighth aspect, the feature amount of the imprint data is encrypted and stored based on, for example, the number of characters of the electronic document, the date and time when the imprint data was added, and the like. Thereby, it is possible to prevent the feature amount of the imprint data from being created illegally. As a result, it is possible to provide an electronic document management system that prevents deletion and plagiarism of a seal imprinted electronically.

An electronic document management method according to a ninth aspect is an electronic document management method for managing an electronic document based on the authenticity of imprint data added to the electronic document. An electronic document management method includes: a document preparing step for preparing an electronic document; an imprint data preparing step for preparing imprint data representing an imprint to be electronically stamped on the electronic document; and preparing identification data associated with the imprint data. Identification data preparation step, and an addition step of adding imprint data to the electronic document;
When the imprint data is added to the electronic document, an identification data adding step of adding identification data corresponding to the added imprint data to the electronic document is included. In the electronic document to which the identification data is added, the identification data is output in a form that cannot be recognized by a person. The electronic document management method further includes an extracting step of extracting imprint data and identification data from the electronic document, and a determining step of determining the authenticity of the imprint data based on the extraction result in the extracting step.

According to the ninth aspect, in the imprint data preparing step, the imprint data representing the imprint to be electronically imprinted on the electronic document is replaced by the identification data associated with the imprint data in the identification data preparing step. , Be prepared respectively. When the imprint data is added to the electronic document in the adding step, the identification data corresponding to the added imprint data is added in the identification data adding step. In an electronic document to which imprint data and identification data are added, since the identification data is output in a form that cannot be recognized by a person, a person can recognize character information and imprint data included in the electronic document but cannot recognize the identification data. . When such an electronic document is circulated, imprint data and identification data are extracted from the electronic document in an extraction step at the circulation destination. In the determining step, for example, when the imprint data and the identification data are extracted from the electronic document, it is determined that the imprint data is correct. Because the identification data does not exist even if the imprint data is stolen, the identification data remains even after the imprint data is deleted, and the existence and remaining of the identification data cannot be recognized by a person who has committed an illegal act. Unauthorized processing can be detected. Thus, the authenticity of the imprint data can be determined using the identification data that cannot be recognized by a person. As a result, it is possible to provide an electronic document management method that prevents deletion and plagiarism of a seal imprinted electronically.

A program according to a tenth aspect of the present invention is a program for managing an electronic document based on the authenticity of imprint data added to the electronic document. The program stores, in a computer, a document storage procedure for storing an electronic document, an imprint data storage procedure for storing imprint data representing an imprint imprinted electronically on the electronic document, and identification data associated with the imprint data. An identification data storing procedure, an adding step of adding imprint data to the electronic document, and an identifying data adding procedure of adding identification data corresponding to the added imprint data to the electronic document when the imprint data is added to the electronic document. Is executed. In the electronic document to which the identification data is added, the identification data is output in a form that cannot be recognized by a person.
The program further causes the computer to execute an extraction procedure for extracting imprint data and identification data from the electronic document, and a determination procedure for determining the authenticity of the imprint data based on the extraction result of the extraction procedure.

According to the tenth aspect, the imprint data representing the imprint to be electronically stamped on the electronic document is stored in the imprint data storage procedure, and the identification data associated with the imprint data is stored in the identification data storage procedure. , Respectively. When the imprint data is added to the electronic document in the adding procedure, the identification data corresponding to the added imprint data is added in the identification data adding procedure. In an electronic document to which imprint data and identification data are added, since the identification data is output in a form that cannot be recognized by a person, a person can recognize character information and imprint data included in the electronic document but cannot recognize the identification data. . When such an electronic document is circulated, imprint data and identification data are extracted from the electronic document by an extraction procedure executed by a program for managing the circulated electronic document. If the imprint data and the identification data can be extracted from the electronic document in the determination procedure, the imprint data is determined to be correct. Because the identification data does not exist even if the imprint data is stolen, the identification data remains even after the imprint data is deleted, and the existence and remaining of the identification data cannot be recognized by a person who has committed an illegal act. Unauthorized processing can be detected. Thus, the authenticity of the imprint data can be determined using the identification data that cannot be recognized by a person. As a result, it is possible to provide a program for managing an electronic document, which prevents deletion and theft of an imprint imprinted electronically.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment> The document management function of the electronic document management apparatus according to the present embodiment is realized by executing a predetermined program by a CPU (Central Processing Unit) in a computer.
In this computer, an electronic document such as settlement request data or circulation data is created, an electronic document such as settlement request data or circulation data received from another computer connected to the network is displayed, or the created electronic document is created. Alternatively, a payment approval stamp or a circulation stamp represented by electronic data is added to the displayed electronic document, and the electronic document is transmitted to another computer via a network or a recording medium.

FIG. 1 shows an external view of a system which is an example of a computer which realizes a document management function. Referring to FIG. 1, this system includes an FD (Flexible Disk) drive 1
06 and CD-ROM (Compact Disc-Read Only Mem)
ory) includes a computer 102 with a drive 108, a monitor 104, a keyboard 110, and a mouse 112.

FIG. 2 is a block diagram showing the configuration of the computer system. As shown in FIG. 2, the computer 102 includes the above-described FD driving device 106 and a CD.
Transmitting and receiving settlement request data or circulation data between a CPU (Central Processing Unit) 120, a memory 122, a fixed disk 124, and another computer connected to each other by a bus in addition to the ROM drive device 108; And a communication interface 128. The FD 116 is set in the FD driving device 106. CD-R
A CD-ROM 118 is set in the OM driving device 108. A predetermined program corresponding to software is stored in the FD 116 and the CD-ROM 118.

As described above, the document management function is realized by the computer hardware and the software executed by the CPU 120. Generally, such software is stored and distributed as a program on a recording medium such as an FD 116 or a CD-ROM 118, and is read from the recording medium by the FD driving device 106 or the CD-ROM driving device 108 and temporarily stored on a fixed disk 124. Is done. Further, from the fixed disk 124 to the memory 12
2 is executed by the CPU 120.

The hardware itself of these computers is general. The computer includes a control circuit including a CPU, a storage circuit, an input circuit, an output circuit, and an OS.
(Operating System) and an environment for executing programs. The program according to the present invention is a program that causes such a computer to realize a document management function. Therefore, the most essential part of the present invention is
This is a program recorded on a recording medium such as an FD, a CD-ROM, a memory card, and a fixed disk.

Since the operation of the computer shown in FIGS. 1 and 2 is well known, detailed description thereof will not be repeated here.

Referring to FIG. 3, fixed disk 124 of a computer for implementing the document management function according to the present embodiment
Will be described. The seal database stores, for each approver who approves an electronic document, information on the approver and seal information. The approver information includes an approver's name, approver's affiliation, approver's job title, approver ID (Identification), password, password expiration date, and so on. The seal information is stored in association with the approver information, and includes a seal ID, seal data, and seal characteristic amount data. The seal stamp feature amount data includes the shape, color, center of gravity position, specific point information, and the like of the seal stamp image data. Hereinafter, in the present embodiment, a description will be given assuming that one approver has one seal information. However, the present invention is not limited to this, and a plurality of seal information may be provided for one approver. Absent.

Referring to FIG. 4, a seal management database stored in fixed disk 124 will be described. The seal management database includes, for each piece of document information stored in the fixed disk 124, document information and seal information corresponding to the document information. This document information will be described as having N seal locations. As shown in FIG. 4, the document information includes a document ID, document feature amount data, creation date, update date,. The document feature data includes a document file name, the number of pages, the number of characters, character string data at a specific position,. With this document feature data, a document created using a computer can be uniquely specified.

The seal information includes N pieces of seal information. Each of the sealing information will be described using the sealing information (1) as an example.
It includes a seal ID (1), seal position information (1), seal size (1), seal characteristic amount (1), seal date and time (1), seal position information (1), and seal characteristic amount (1).

Referring to FIG. 5, a seal object and a seal object to be pasted on an electronic document will be described. FIG. 5 shows a seal object 202 created based on the seal information. Seal object 202
Is affixed inside the seal frame 200. In FIG.
The seal object 204 created corresponding to the seal object 202 is shown. The positional relationship between the seal object 202 and the seal object 204, the seal object 20
The ratio of the size of the tally object 204 to the size of 2, for example, is predetermined.

The marking object 204 is visualized and displayed for the sake of explanation. However, in an actual electronic document, the marking object 204 cannot be grasped by the user's vision. This tally object 204
Is attached to the electronic document as an object having the same color as the background color of the electronic document. Further, the object is pasted by distinguishing the layer on which the stamp object is pasted from the layer on which the stamp object is pasted.

A case will be described in which a seal object and a stamp object are pasted on one layer. It is assumed that the seal object and the seal object are represented as a set of pixel data in pixel units. The color of the seal object is specified for a pixel where the seal object and the seal object overlap. The color of the background color of the electronic document is specified for a pixel that does not exist in both the seal object and the seal object. The color of the seal object is specified for the pixel where the seal object exists and the seal object does not exist. The color of the background color of the electronic document is specified for the pixel where the seal object does not exist but the seal object exists, and the presence of the seal object is stored in the seal management database.

Referring to FIG. 6, a program executed by the electronic document management apparatus according to the present embodiment has the following control structure for the sealing process.

Step (hereinafter, step is abbreviated as S)
At 100, CPU 120 determines whether a request for document creation or document update has been detected. The request for creating a document or updating a sentence is made based on an input from the keyboard 110 or the mouse 112, for example. When a document creation or document update request is detected (YE in S100)
S), the process is moved to S102. On the other hand, if neither a document creation request nor a document update request is detected (NO in S102), the process proceeds to S104.

At S102, CPU 120 performs document creation processing or document update processing. At S104, the CP
U120 makes an input request for an approver ID and password. At this time, a screen requesting the input of the approver's ID and password is displayed on the monitor 104.

At S106, CPU 120 proceeds to S104
Input by the user in response to the input request at
It is determined whether the approver ID and the password match. This determination is made based on the approver information stored in the seal database shown in FIG. If the approver ID and the password match (YES in S106), the process proceeds to S108. On the other hand, if the approver ID and the password do not match (NO in S106), the process proceeds to S12.
Moved to 4.

At S108, CPU 120 determines approver I
Based on D, the seal information is read from the seal database shown in FIG. In S110, CPU 120 requests designation of a sealing position. The user inputs a position where the user wants to paste an object based on the seal data. S11
In 2, CPU 120 displays a seal object based on the seal data read in S108 at a position designated by the user. At S114, CPU 120
Stamp position information is created based on the position specified by the user, and stamp position information is created based on the created stamp position information. The marking position information is created based on a predetermined positional relationship between the sealing object and the marking object.

At S116, CPU 120 proceeds to S102.
A stamp feature is created based on the stamp feature of the stamp information read and the current date and time. For example, in the centroid position (X coordinate) of the seal feature amount, a numeral created by the last digit of the year, month, and day (1040 on April 4, 2001)
4) is added, and a number (1 at 15:34) created by the current time is added to the barycentric position (Y coordinate) of the seal stamp feature amount.
534) is added to calculate the marking feature amount. The current date and time is stored as the date and time in the seal management database. The calculated stamp feature amount is stored in the seal management database.

At S118, CPU 120 pastes a seal object on the document data. At this time, S10
At step S8, a seal object based on the seal information displayed at step S112 is attached.

At S120, CPU 120 proceeds to S118
The document data to which the seal object is attached is stored in the fixed disk 124. At S122, CPU 12
0 updates the seal management database shown in FIG. At this time, the sealing information about the newly stamped seal is stored.

In S124, CPU 120 determines in S106
If the approver ID and password do not match at
Perform error handling. The error processing in S124 displays, for example, that the approver ID and the password do not match on the monitor 104.

Referring to FIG. 7, the program executed by the electronic document management apparatus according to the present embodiment has the following control structure for the determination processing.

At S200, CPU 120 determines whether a read request for document data has been detected or not. The read request at this time is performed by designating a file name. When reading of document data is requested (Y in S200)
ES), the process proceeds to S202. On the other hand, if a document data read request is not detected (NO in S200), the process returns to S200, and waits until a document data read request is detected.

At S202, CPU 120 proceeds to S200
On the fixed disk 12 based on the file name detected in
4 to read the document data. At S204, CPU 12
0 reads the seal management database shown in FIG. 4 based on the file name.

In S206, CPU 120 determines in S202
Retrieves the seal object from the read document data. At this time, a seal object is searched based on the seal position information in the seal management database.

At S208, CPU 120 proceeds to S202
Searches for the marking object from the read document data. At this time, the stamp object is searched based on the stamp position information in the stamp management database.

At S210, CPU 120 determines whether or not a seal object exists. If a seal object exists in the document data read in S202 (YES in S210), the process proceeds to S212. On the other hand, if the stamp object does not exist in the document data read in S202 (N in S210)
O), the process is moved to S214.

At S212, CPU 120 proceeds to S202
It is determined whether or not the mark object exists in the read document data. If the mark object exists in the document data read in S202 (YES in S212), the process proceeds to S218. On the other hand, S20
If there is no mark object in the document data read in 2 (NO in S212), the process proceeds to S216.
Moved to

In S214, if there is no seal object in the read document data (NO in S210), CPU 120 determines whether or not the seal object exists in the document data read in S202. to decide. If there is a tally object (YES in S214), the process proceeds to S220. On the other hand, if the stamp object does not exist in the read document data (NO in S214), the process proceeds to S222.

The determination of the presence of the seal object and the stamp object in S210 to S214 is performed as follows in addition to the detection of the seal object and the seal object. When the seal object and the seal object exist, the CPU 120 reads the seal feature amount and the seal date and time of the seal management database read in S204. The barycentric position (coordinate) of the seal stamp feature is calculated based on the read stamp feature and the stamp date and time. The calculated center-of-gravity position is compared with the center-of-gravity position of the seal object, and only when they match, it is determined that the seal object and the stamp object exist. If they do not match, it means that even if the stamped object is detected, the stamped date and time are different and the center of gravity of the stamp is different, so that the detected stamped object is not the one that was properly stamped.

At S216, CPU 120 performs error processing. In the error processing in S216, the monitor 104 indicates that the seal may have been diverted. At S218, CPU 120 performs normal processing. That is, the seal is treated as legitimate,
The electronic document is determined to be legitimate.

At S220, CPU 120 performs error processing. The error processing performed in S220 indicates, for example, that the seal may have been deleted halfway. At S222, CPU 120 performs normal processing. At this time, for example, the seal is displayed on the monitor 104 as if the seal was not found.

At S224, CPU 120 determines at S202
Then, it is determined whether or not the document data read out further includes seal information. If there is further seal information in the document data (YES in S224), the process returns to S206, and a determination process for the next seal information is performed. On the other hand, if there is no seal information in the document data (NO in S224), this determination processing ends.

The operation of the electronic document management device based on the above structure and flowchart will be described.

[Seal Operation] When the computer user requests document creation or document update (YE at S100)
S), a document creation process or a document update process is performed (S102). The document created at this time is shown in FIG. As shown in FIG. 8, the electronic document 300 includes an approval column 310 in which a circulation route and an approver are predetermined, and an approval column 330 written by the approver himself during circulation. The approval column 310 stores approval frames 312 to 324 in the approval column 330.
Include approval frames 332-342.

The user who has completed the document creation or document update inputs an approver ID and password into the computer (S104). If the approver ID matches the password (YES in S106), the seal information (FIG. 3) is read based on the approver ID.

When the user designates the seal position of the seal object (S110), the seal object is displayed at the designated position of the electronic document based on the seal data (S112). The user selects the approval frames 312 to 32 shown in FIG.
324, the inside of one of the approval frames 332 to 342 is specified, and a seal object based on the seal data of the user is displayed in the specified approval frame.

The stamp position information and the stamp position information are created (S114), and the stamp feature amount is created based on the stamp feature amount and the current date and time (S116). The seal object and the seal object are pasted on the document data (S118).

At this time, the marking object pasted on the document data is displayed invisible to the user. The document data to which the tally object is attached is stored on the fixed disk 124 (S120). The seal management database shown in FIG. 4 is updated (S122). At this time, the date and time of the seal
The imprint feature amount and the like are newly stored in the seal management database.

The electronic document to which the seal object and the seal object are pasted is transmitted to another computer via the communication interface 128.

[Judgment Operation] When a document data read request is input from another computer connected to the network (YES in S200), the document data is read based on the file name (S202), and the seal management database Is read (S204).

A seal object is searched for based on the seal position information of the seal management object (S206).
A seal object is searched for based on the seal position information of the seal management object (S208).

If the seal object exists (YES in S210) and the seal object does not exist (NO in S212), it is determined that the seal is likely to have been diverted, and error processing is performed (S216). If the seal object exists (YES in S210) and the seal object exists (YES in S212),
The seal is determined to be normal as a normal process (S
218).

If the seal object does not exist (S21
If the stamp object exists (YES in S214), it is determined that the seal may have been deleted halfway as an error process (S22).
0). If the seal object does not exist (NO in S210) and the seal object does not exist (S2
(NO in 14), it is determined that the seal was not originally found as a normal process (S222). If the seal is determined to be legitimate, the electronic document is determined to be legitimate.

As described above, the electronic document management apparatus according to the present embodiment performs document management based on the presence / absence of a seal object visually recognizable by a user and the presence / absence of an unrecognizable seal object. Can be. As a result, it is possible to provide an electronic document management device capable of preventing deletion and plagiarism of a seal imprinted electronically.

In the above description, the stamp feature is converted using the stamp date and time, and the converted feature is stored as the stamp feature in the stamp management database. However, the present invention is not limited to this. Without converting the seal features,
It can also be stored as a seal feature in the seal management database. In this way, the seal is extracted from the electronic document, the characteristic amount of the extracted seal is calculated, the calculated characteristic amount is compared with the seal characteristic amount stored in the seal management database, and the trueness of the seal is determined. Judge false. This eliminates the need for conversion based on the stamp date and time.

In addition to the description of the above-described determination processing, processing for detecting falsification of the read document data can be added. The following processing is performed between the processing of S204 and the processing of S206 in FIG. The CPU 120 executes S202
The feature amount of the read document data is calculated. The feature amount is, for example, the number of pages, the number of characters, and the like. CPU 12
0 retrieves the document feature amount of the seal management database (FIG. 4) read in S204. The CPU 120 compares the calculated document feature value with the extracted document feature value, and if they match, determines that the document data has not been tampered with.
Step 6 and subsequent steps are performed. If they do not match, it is determined that the document data has been tampered with, error processing is performed, and this determination processing ends.

<Second Embodiment> An electronic document management apparatus according to a second embodiment of the present invention is different from the first embodiment in that it does not store the seal management database in the first embodiment. Other hardware configurations and flowcharts are the same as those in the first embodiment. Therefore, a detailed description of them will not be repeated here.

Referring to FIG. 9, fixed disk 124 of a computer for implementing the document management function according to the present embodiment
Will be described. The seal frame data includes seal frame information indicating the position and size of the seal frame for each seal number corresponding to the seal position. The seal frame information includes coordinate data of the upper left corner and coordinate data of the lower right corner of the seal frame to which the seal object is to be attached.

Referring to FIG. 10, the program executed by the electronic document management apparatus according to the present embodiment has the following control structure for the sealing process. In the processing shown in FIG. 10, the same processing as the processing in FIG. 6 of the above-described first embodiment is denoted by the same step number. Therefore, detailed description thereof will not be repeated here.

At S112, CPU 120 displays the seal stamp data read at S108 at the position designated by the user. Thereafter, the process proceeds to S150.

At S150, CPU 120 creates a stamp object based on the stamp information of the designated stamp frame. Details of the creation of the tally object will be described later. Thereafter, the process proceeds to S118.

At S118, CPU 120 pastes a seal object on the document data. At this time, S10
At step S8, a seal object based on the seal information displayed at step S112 is attached.

Referring to FIG. 11, a program executed by the electronic document management apparatus according to the present embodiment has the following control structure for determination processing. In the processing shown in FIG. 11, the same processing as the processing in FIG. 7 of the first embodiment described above is denoted by the same step number. Therefore, detailed description thereof will not be repeated here.

At S202, CPU 120 proceeds to S200
On the fixed disk 12 based on the file name detected in
4 to read the document data. Thereafter, the process proceeds to S250.

At S250, CPU 120 proceeds to S202
Searches for the seal object and the seal object from the document data read out by. At this time, a seal object and a seal object are searched based on the seal frame information. Thereafter, the process proceeds to S210.

At S210, CPU 120 determines whether or not a seal object exists. If a seal object exists in the document data read in S202 (YES in S210), the process proceeds to S212. On the other hand, if the stamp object does not exist in the document data read in S202 (N in S210)
O), the process is moved to S214.

With reference to FIGS. 12 to 14, the creation of the tally object will be described. A seal object is temporarily arranged based on the seal information and the seal frame information (FIG. 1).
2). At this time, a stamp object having a fixed positional relationship with the stamp object and a fixed size ratio is arranged together with the stamp object.

When the imprint object protrudes outside the frame of the electronic document or protrudes beyond the imprint frame of the imprint object corresponding to the imprint object, the imprint object is rotated.

At this time, the seal object is rotated around the center of gravity (FIG. 13), or rotated around the center of gravity of the seal object (FIG. 14).
In either case, the stamp object is rotated so that the stamp object fits within the frame of the electronic document and does not protrude into the adjacent stamp frame.

On the other hand, if the rotation cannot fit into the frame of the electronic document and does not protrude into the adjacent stamp frame, the size of the stamp object is reduced. A predetermined ratio of the size of the stamp object to the size of the seal object is reduced. The marking object is reduced so as to fit within the frame of the electronic document and not protrude into the adjacent sealing frame. The rotation and reduction of the tally object can be performed together.

In both cases where the marking object is rotated, reduced, and rotated and reduced, the marking object always overlaps a part of the marking object. By doing this,
When the seal object can be detected, a seal object overlapping the detected seal object can be easily detected. When detecting a seal object, the seal frame data can be used. By searching only the inside of the seal frame based on the seal frame information, the seal object and the seal object can be detected.

As described above, in the electronic document management apparatus according to the present embodiment, similarly to the above-described first embodiment, the presence / absence of a seal object visually recognizable by the user, Document management can be performed depending on the presence or absence of the tally object.

<Modification> Hereinafter, as a modification of the above-described embodiment, a marking object having a shape different from the above-described marking object will be described.

The shape of the tally object is not limited to a band like the tally object 204 in FIG. Shapes include any shape, including the shape of a point represented by one pixel.

The marking object includes a plurality of divided marking objects. As shown in FIG. 15, the marking object 204 pasted on the electronic document has two marking areas 400 and 4 in the sealing management database.
02 and is managed separately. The division example shown in FIG.
An area overlapping the seal object is set as a marking area 400, and other areas are set as a marking area 402. FIG.
In the division example shown in FIG. 6, the marking object 204 is divided into four marking regions 410 to 41 so that the areas of the regions are equal.
This is divided into six. In addition to the division into equal areas, the division may be performed so that the distance in a certain direction of the marking object is equal. In the division example shown in FIG. 17, the marking object 204 is divided into the marking area 40 shown in FIG.
0 and the marking object 204
Are divided into a marking area 420 having the center of gravity of a point symmetry and a marking area 422 having a point symmetry.

In addition to the division examples shown in FIGS.
Document information (number of pages,
Based on parameters calculated based on the number of characters, creation date and time, and sealing information (seal feature, sealing date and time)
The mark object can also be divided.

Further, more robust document management can be performed using the divided seal objects. S1 corresponding to at least one marking area (for example, marking area 420 in FIG. 17) of the divided sealing object.
Information obtained by encrypting the marking feature amount calculated in 16 is stored. Other marking areas (for example, marking area 4 in FIG. 17)
Corresponding to 22), release key information for decrypting the encrypted marking feature amount is stored. In this case, the processing is performed as follows in S210 to S214 of the determination processing.

When the seal object and the seal object are present, the seal feature amount (encryption information) stored in association with the seal area 420 created by dividing the seal object is read. The release key information stored in association with the marking area 422 is read. The read signature feature is decrypted using the release key information to calculate a signature feature (decryption information). The barycentric position (coordinate) of the seal stamp feature is calculated based on the calculated stamp feature and the stamp date and time of the stamp management database. The calculated center-of-gravity position is compared with the center-of-gravity position of the seal object, and only when they match, it is determined that the seal object and the stamp object exist. In this way, if both the divided marking area 420 and the divided marking area 422 do not exist, the sealing object attached to the electronic document is not determined to be a legitimate sealing object. It is possible to more firmly manage the stamp object during circulation of the electronic document.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is an external view of a computer that realizes an electronic document management system.

FIG. 2 is a control block diagram of the computer shown in FIG.

FIG. 3 is a view showing a seal database according to the first embodiment.

FIG. 4 is a diagram showing a seal management database according to the first embodiment.

FIG. 5 is a diagram illustrating a display example of a seal object and a seal object.

FIG. 6 is a flowchart illustrating a sealing process according to the first embodiment.

FIG. 7 is a flowchart illustrating a determination process according to the first embodiment.

FIG. 8 is a diagram illustrating a display example of an electronic document.

FIG. 9 is a diagram showing stamp frame data according to the second embodiment.

FIG. 10 is a flowchart illustrating a sealing process according to the second embodiment.

FIG. 11 is a flowchart illustrating a determination process according to the second embodiment.

FIG. 12 is a diagram illustrating a display example (part 1) of a seal object.

FIG. 13 is a diagram illustrating a display example (part 2) of a seal object.

FIG. 14 is a diagram illustrating a display example (part 3) of a seal object.

FIG. 15 is a diagram illustrating a display example (part 4) of a seal object.

FIG. 16 is a diagram illustrating a display example (part 5) of a seal object.

FIG. 17 is a diagram illustrating a display example (part 6) of a seal object.

[Explanation of symbols]

102 computer, 104 monitor, 106 FD
Drive, 108 CD-ROM drive, 110 keyboard, 112 mouse, 116 FD, 118 C
D-ROM, 120 CPU, 122 memory, 124
Fixed disk, 128 communication interface.

Claims (10)

[Claims] 1. An electronic document management system for managing an electronic document based on the authenticity of imprint data added to the electronic document, the electronic document management system comprising: a document storage for storing the electronic document; Means, imprint data storage means for storing imprint data representing an imprint to be electronically imprinted on the electronic document, identification data storage means for storing identification data associated with the imprint data, An addition unit connected to the document storage unit and the imprint data storage unit, for adding the imprint data to the electronic document, connected to the addition unit and the identification data storage unit,
When the imprint data is added to the electronic document, identification data adding means for adding identification data corresponding to the added imprint data to the electronic document, and in the electronic document to which the identification data is added, The identification data is output in a form that cannot be recognized by a person, and the electronic document management system is further connected to an extraction unit for extracting the seal imprint data and the identification data from the electronic document; and A determination unit for determining whether the imprint data is authentic based on an extraction result by the extraction unit. 2. The electronic device according to claim 1, wherein the identification data adding unit includes a unit for adding the identification data to a position that satisfies a predetermined relationship with a position to which the imprint data is added. Document management system. 3. The electronic document management system according to claim 1, wherein the identification data is data for outputting an object using the same color as a background color of the electronic document in the electronic document. 4. The determination means according to claim 1, wherein
4. The electronic document according to claim 1, further comprising a unit configured to determine whether the imprint data is true when the imprint data is extracted and the identification data is extracted. 5. Management system. 5. The determination means according to claim 1, wherein:
When the seal imprint data is extracted, and the identification data is not extracted, and the identification data is extracted,
4. The electronic document management system according to claim 1, further comprising: a unit configured to determine whether the imprint data is false when the imprint data is not extracted. 5. 6. The document management system is connected to a feature amount storage unit for storing a feature amount of the seal imprint data in association with the seal imprint data stored in the seal imprint data storage unit, and the extraction unit. Calculating means for calculating a characteristic amount of the seal imprint extracted from the electronic document, wherein the determination unit determines the seal imprint data based on the extraction result of the seal imprint data and the identification data by the extracting unit. A first judging unit for judging the true / false of the characteristic amount, and a characteristic amount stored in association with the imprint data extracted by the extracting unit from the characteristic amount storing unit,
Second determining means for determining the authenticity of the imprint data based on the characteristic amount calculated by the calculating means and the read characteristic amount; a determination result by the first determining means; 2. The electronic document management system according to claim 1, further comprising: a unit configured to determine whether the imprint data is authentic based on a result of the determination by the second determining unit. 3. 7. The feature amount storage unit includes a unit for storing the feature amount in association with identification data added to the electronic document when the seal imprint data is added to the electronic document, The second judging means reads out the characteristic amount stored in correspondence with the identification data extracted by the extracting means from the characteristic amount storing means, and reads the characteristic amount calculated by the calculating means and the read-out characteristic amount. The electronic document management system according to claim 6, further comprising a unit configured to determine whether the imprint data is true or false based on the characteristic amount. 8. The electronic document management system according to claim 6, wherein the feature amount of the imprint data is encrypted and stored. 9. An electronic document management method for managing the electronic document based on the authenticity of imprint data added to the electronic document, the electronic document management method comprising: a document preparation step for preparing the electronic document; An imprint data preparing step for preparing imprint data representing an imprint imprinted electronically on the electronic document; an identification data preparing step for preparing identification data associated with the imprint data; An adding step of adding the identification data to the document; an identification data adding step of adding identification data corresponding to the added imprint data to the electronic document when the imprint data is added to the electronic document; In the generated electronic document, the identification data is output in a form that cannot be recognized by a person, and the electronic document management method further includes: From the document, the seal image data and extracting and said identification data, based on the extraction result of the extracting step, and a determination step of determining authenticity of the seal image data, electronic document management method. 10. A program for managing the electronic document based on the authenticity of the imprint data added to the electronic document, the program comprising: a document storage procedure for storing the electronic document in a computer; An imprint data storing procedure for storing imprint data representing an imprint that is electronically imprinted on an electronic document, an identification data storing procedure for storing identification data associated with the imprint data, and adding the imprint data to the electronic document. When the imprint data is added to the electronic document, an identification data adding procedure of adding identification data corresponding to the added imprint data to the electronic document is executed, and the identification data is added. In the electronic document, the identification data is output in a form that cannot be recognized by a person, and the program is further transmitted to the computer. From serial electronic document, the seal impression and the extraction procedure for extracting the data and the identification data, on the basis of the extracted result of the extraction procedure, the seal image to execute a determination procedure for determining the authenticity of the data, the program.