JP2000132543A - Document processing system and document processing method, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make quickly and properly processable secret document information, to make clear the secret part of the secret document information and to make properly manageable the secret of the secret document information by its providing side. SOLUTION: A secret area is designated in the document information via an area designation part 12, and a partial document information on the designated area is enciphered at an encipherment part 13 to obtain the enciphered information. At a management information generation part 14, the address information on the designated area and the key information on the encipherment are stored in a management table and the management information is generated. Then, the part 14 replaces an object area included in the text of the document information, i.e., the designated area with the enciphered information via the part 13 and transmits or stores the enciphered information together with the management information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for processing document information, and more particularly to a document processing system, method and recording for effectively maintaining encryption and confidentiality of document information by effectively utilizing encryption processing. Regarding the medium.

[0002]

2. Description of the Related Art In modern times, various document information plays a major role in performing various tasks. That is, in many operations, document information is used in all stages such as planning / planning, examination / evaluation, detailed explanation, content confirmation, correction / revision, presentation / report / communication, and materialization. Therefore, not only document information including only contents to be publicly disclosed, but also document information including contents belonging to secret is frequently used.

In order to keep confidential document information including contents belonging to secret, that is, to protect confidential information, the document information is generally handled after being encrypted. The encrypted information is information of unknown meaning as it is, and only a person who holds a specific key can decrypt the information and decrypt the substance, and a person who does not have a decryption key can decrypt the information. It cannot be decoded without meaning. If a method of decrypting / decrypting the content without a key or estimating the key is found, the encryption technology itself will not be valid as a cipher. Has been proposed and used.

Conventionally, document information including confidential information in the description can be viewed only by a specific person concerned, and can be decrypted and decrypted only by the person concerned so that the information cannot be seen by anyone other than the person concerned. In this way, the entire document information is encrypted. In this case, a key for decryption is given to the specific party in advance so that only the specific party can decrypt the key, or only the specific party can obtain the key for decryption. Keep it
The encrypted document information is provided to the specific person concerned.

[0005] That is, a specific person can decrypt the received encrypted document information using the decryption key.
However, even if the third party who cannot know the entity of the document information but can obtain the decryption key cannot obtain the key even if the encrypted document information is obtained, the third party cannot decrypt the document. Therefore, the entity of the document information cannot be known.

[0006]

Conventionally, as described above, when document information including confidential information is handled by being encrypted, the entire document information has been encrypted. this is,
This is because encryption and decryption are performed on the basis of a file or the like in which document information is stored, and a technique related to partial encryption of document information has not been established.

[0007] By the way, there is the following problem in the conventional confidential management of document information by encryption. (1) When the size of the document information, that is, the capacity of the document information file is large, the time required for the encryption and decryption processing becomes long. (2) Since the encryption and decryption processes are performed on the entire document, it is unclear which part of the document information that is truly confidential, that is, confidential, is the information content. (3) Due to erroneous judgment of the recipient (decipherable party) of the relevant document information due to (2) of the preceding paragraph, careless partial or total conversion from decrypted document information to other document information Editing operations such as typical copy or paste are easily performed. That is,
The appropriate recipient of the document information edits the original confidential content of the decrypted and decrypted document information by copying or pasting it into other document information, and performs processing for confidential processing such as encryption. There is a risk that it will be disclosed without giving it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and enables short-time and appropriate processing of document information requiring confidentiality. It is an object of the present invention to provide a document processing system, a method and a recording medium which enable appropriate confidential management by a provider of a document.

[0009]

In order to achieve the above object, a document processing system according to a first aspect of the present invention comprises:
Area designating means for designating one or more specific areas in the document information; and encrypting information of the specific area designated by the area designating means, and specifying the original document information in the encrypted information. A partial encryption unit that replaces the contents of the region; and information about the specific region specified by the region specification unit and management information related to an encryption key in the partial encryption unit are generated and processed by the partial encryption unit. Management information generating means for adding to the encrypted document information.

Also, in the document processing system according to the second aspect of the present invention, the information of the specified specific area is encrypted, and the contents of the specific area of the original document information are added to the encrypted information. A system for processing encrypted document information to which information on the specific area and management information on the encryption key are added, wherein the management information is based on a separately provided decryption key. A partial decryption unit that decrypts the information of the specific area of the added encrypted document information and replaces the decrypted information with the information of the specific area of the encrypted document information; Document information display means for displaying the obtained document information;
Is provided.

An editing prohibition unit for performing a process of prohibiting editing of the decipherment information of the specific area of the document information processed and deciphered by the partial decoding unit, and displaying the deciphered information for display by the document information display unit. May be.

According to a third aspect of the present invention, there is provided a document processing system comprising: an area designating unit for designating one or more specific areas in document information; and encrypting information of the specific area designated by the area designating unit. Partial encryption means for replacing the contents of the specific area of the original document information with the encrypted information; information about the specific area specified by the area specification means; Management information generating means for generating management information relating to the key of the above, and adding the management information to the encrypted document information processed by the partial encryption means; and an encryption method to which the management information is added based on a separately provided decryption key. Partial decryption means for decrypting the information of the specific area of the document information and replacing the decrypted information with the information of the specific area of the encrypted document information; and document information processed and decrypted by the partial decryption means. Comprising an editing prohibiting means for performing processing for prohibiting editing the decryption information of the specific area, and a document information display means for displaying the document information processing has been performed to prohibit editing by said editing inhibiting means.

[0013] A document processing method according to a fourth aspect of the present invention is an area designating step for designating one or more specific areas in document information, and a part for encrypting information of the specific area designated in the area designating step. An encryption step, an encryption replacement step of replacing the content of the specific area of the original document information with the information encrypted by the partial encryption step, and information on the specific area specified in the area specifying step And a management information generating step of generating management information relating to an encryption key in the partial encryption step; and converting the management information generated in the management information generation step into encrypted document information processed in the encryption replacement step. And adding a management information.

In a document processing method according to a fifth aspect of the present invention, information of a specified specific area is encrypted, and the content of the specific area of the original document information is replaced with the encrypted information. When processing the encrypted document information to which information about the specific area and the management information about the encryption key are added, the encryption information to which the management information is added based on a decryption key given separately. A partial decryption step of decrypting the information of the specific area of the document information; a decryption replacement step of replacing the decrypted information decrypted by the partial decryption step with information of the specific area of the encrypted document information; A document information display step of displaying the document information processed in the step.

[0015] The document information processed and decoded in the partial decoding step is subjected to a process of prohibiting editing of the decoding information in the specific area of the document information replaced in the decoding replacement step, and is provided for display in the document information displaying step. A prohibition processing step may be further included.

In a document processing method according to a sixth aspect of the present invention, an area specifying step for specifying one or more specific areas in document information, and a part for encrypting information of the specific area specified in the area specifying step An encryption step, an encryption replacement step of replacing the content of the specific area of the original document information with the information encrypted by the partial encryption step, and information on the specific area specified in the area specifying step And a management information generating step of generating management information relating to an encryption key in the partial encryption step; and converting the management information generated in the management information generation step into encrypted document information processed in the encryption replacement step. A management information adding step of adding, based on a separately provided decryption key, the management information added to the encrypted document information; A partial decryption step of decrypting information of the constant area, a decryption replacement step of replacing the decryption information decrypted by the partial decryption step with information of the specific area of the encrypted document information, and a partial decryption step. Prohibition processing step of performing a process of prohibiting editing of the decryption information of the specific area of the document information replaced in the decryption and replacement step, and a document information display for displaying the document information processed in the prohibition processing step And

A recording medium according to a seventh aspect of the present invention comprises:
A computer for encrypting information of a specific area specified by the area specifying means by designating one or more specific areas in the document information; A partial encryption unit that replaces the content of the specific area; and information about the specific area specified by the area specification unit and management information related to an encryption key in the partial encryption unit. And a program for functioning as management information generating means to be added to the encrypted document information processed in (1).

A recording medium according to an eighth aspect of the present invention comprises:
The computer is configured to encrypt information of a specified specific area, replace the contents of the specific area of the original document information with the encrypted information, and obtain information on the specific area and the encryption. In a system for processing encrypted document information to which management information related to the key is added, based on a separately provided decryption key, the information of the specific area of the encrypted document information to which the management information is added is decrypted. A partial decryption unit that replaces the decryption information with information of the specific area of the encrypted document information, and a document information display unit that displays document information processed and decrypted by the partial decryption unit.
It records a program to function as.

A recording medium according to a ninth aspect of the present invention comprises:
A computer for encrypting information of a specific area specified by the area specifying means by designating one or more specific areas in the document information; A partial encryption unit that replaces the content of the specific region, information about the specific region specified by the region specification unit, and management information about an encryption key in the partial encryption unit are generated. Management information generating means for adding to the processed encrypted document information, based on a separately provided decryption key, decrypting the information in the specific area of the encrypted document information to which the management information has been added, and With the information of the specific area of the encrypted document information, and a process of prohibiting editing of the decryption information of the specific area of the document information processed and decrypted by the partial decryption means. Editing disabling means for performing, and records a program for functioning as a document information display means for displaying the document information processing has been performed to prohibit editing by said editing inhibiting means.

The document processing system, method, and recording medium according to the present invention add information for managing a confidential portion in a document, encrypt only a portion of the document that requires confidentiality, and encrypt the document when browsing the document. The decrypted part is decoded and displayed. Further, at the time of the display, editing may be prohibited for the encrypted portion.

In this system, the number of portions to be subjected to encryption / decryption processing is reduced as compared with the prior art, so that the processing time can be reduced. In addition, since the encrypted document can be managed in the decrypted document, it is possible to prevent editing operations such as copying or pasting of the truly confidential part, and to leak confidential information. Can be effectively prevented.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. A document processing system according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a basic configuration of a document processing system according to an embodiment of the present invention. The document processing system shown in FIG. 1 includes an encryption unit 1 and a decryption unit 2 that are connected to each other via a transmission system or a storage system.

The encryption unit 1 is a document creation side, and includes a document creation unit 11, an area designation unit 12, an encryption processing unit 13, and a management information generation unit 14.

The document creation section 11 inputs and creates document information by a user's input operation or the like. The area specification unit 12 specifies an area to be kept secret by the user's operation in the created document information, that is, an area to be encrypted. The encryption processing unit 13 encrypts partial document information of the designated area specified by the area designating unit 12 in the document created by the document creating unit 11 and generates the encrypted information. Also, the encryption processing unit 13
Replaces the partial document information of the specified area in the document information with the encrypted information.

The management information generator 14 generates management information including a management table including key information such as the address information of the area designated by the area designator 12 in the document information and the encryption key used for encrypting the part. . Further, the management information generation unit 14 adds management information to the document information, and the document information to which the management information has been added is transmitted to a transmission system such as a network or written into a storage system such as a storage device.

The decryption unit 2 is on the document browsing side, and includes a decryption key supply unit 21, a decryption processing unit 22, a management information processing unit 23, an edit prohibition processing unit 24, and a display processing unit 25. The decryption key supply unit 21 is for decrypting the encryption information included in the document information, which is input at the time of browsing the document information received from the transmission system or read from the storage system, or input by the viewer prior to the browsing. The decryption key is held and supplied to the decryption processing unit 22.

When browsing the document information received from the transmission system or read from the storage system, the decryption processing unit 22 extracts management information from the document information and provides it to the management information processing unit 23. The encrypted information of the document information is decrypted and decrypted based on the management table supplied from the information processing unit 23 and the decryption key supplied from the decryption key supply unit 21. Further, the decryption processing unit 22 replaces the encrypted information of the document information with the partial document information of the designated area decrypted and decrypted based on the management table supplied from the management information processing unit 23.

The management information processing section 23 extracts a management table necessary for decryption and reproduction of the original document information from the management information supplied from the decryption processing section 22 and supplies the management table to the decryption processing section 22. The management information processing unit 23 also supplies the management table to the editing prohibition processing unit 24.

The edit prohibition processing unit 24
Prior to displaying the document information in which the encrypted information has been decrypted and decrypted and replaced with the partial document information, an editing operation such as copy or paste for the specified area is prohibited in cooperation with the display processing unit. The technique of the editing prohibition processing by the editing prohibition processing unit 24 is a technique different from the present invention. For example, transfer to the clipboard in the window system is prohibited, new information is inserted into the part, and This is done by prohibiting deletion of information from the part. In particular, if the display processing in the display processing unit 25 is unique to the system, the editing prohibition processing unit 24
Can be easily realized by an operation related to the display processing unit 25.

The display processing unit 25 decrypts and decrypts the encrypted information in the decryption processing unit 22 and replaces the encrypted information with the partial document information.
Further, the document information subjected to the editing prohibition processing by the editing prohibition processing unit 24 is displayed on the display screen. In particular, in order to easily and reliably perform editing prohibition processing by the editing prohibition processing unit 24, it is desirable that display processing in the display processing unit 25 be unique to the system.

As shown in FIG. 2, such a document processing system is connected to a transmission system such as a communication line and a network, or to a storage system such as a storage device including a storage device on a network. Computer system.

The document processing system 100 shown in FIG. 2 includes an encryption unit 101, a decryption unit 102, an input / output unit 103, and a control unit 1.
The operation terminal 105 is connected to the input / output unit 103, and the file storage unit 106 is connected to the control unit 104. The control unit 104 may be further coupled to a transmission system or a storage system.

The encryption unit 101 and the decryption unit 102 perform the functions of the encryption unit 1 and the decryption unit 2 shown in FIG. 1, respectively. That is, the encryption unit 101 is used to encrypt information in a designated area portion in the document information,
Is used to recover encrypted information. The input / output unit 103 processes an operation input by the user from the operation terminal 105, a display output to the operation terminal 105, and the like.
The input / output unit 103 processes not only user operations but also data input / output based on other programs or the like. Control unit 10
Reference numeral 4 denotes a so-called central processing unit (CPU), which controls operations of the encryption unit 101, the decryption unit 102, and the input / output unit 103, and exchanges information with these. The control unit 104 includes a file storage unit 106 for storing document information and the like.
Are combined. The control unit 104 is coupled to a transmission system such as a communication line and a network, or to a storage system such as a storage device including a storage device on the network.

The document processing system shown in FIG. 2 is used alone or connected to similar systems via a transmission system such as a network. When the document processing system as shown in FIG. 2 is constructed independently, that is, as a stand-alone system, the user operates the input / output unit 1 via the operation terminal 105.
The document information input through the file 03 is partially encrypted by the encryption unit 101 for the designated area as described above, and is stored in the file storage unit 106. When another user, that is, a viewer, browses the document information stored in the file storage unit 106, the document information is read out from the file storage unit 106 as it is, and the designated area remains encrypted even when used for display and browsing. Yes, the encrypted content cannot be decrypted.

A legitimate viewer has key information such as a decryption key for decryption. By inputting the key information from the operation terminal 105 through the input / output unit 103, the file storage unit The decryption unit 102 decrypts the encrypted information of the specific area of the document information read from 106,
It can be replaced with the decrypted partial document information for display. At this time, the decryption unit 102 performs a process of prohibiting copying or editing of the decrypted partial document information of the designated area, and displays it. Therefore, for the specified area,
Cut and paste or other editing operations cannot alter the content, write it to another document, or cite it in another document.

When a document processing system as shown in FIG. 2 is constructed on a network or the like via a transmission system or an external storage system or the like, a user inputs a document from the operation terminal 105 via the input / output unit 103. Encrypting unit 10 for document information
According to 1, the partial encryption process is performed on the designated area as described above, and the encrypted area is transferred to the transmission system or the storage system. Prior to this transfer, similar document information is stored in the file storage unit 1.
06 may be stored.

The browsing side also has a document processing system similar to that shown in FIG. 2, and when another user, that is, a viewer, browses the document information received via the transmission system or read from the storage system, The designated area remains encrypted even if it is displayed and viewed as it is, and the encrypted contents cannot be decrypted.

A legitimate viewer has key information such as a decryption key for decryption. By inputting the key information from the operation terminal 105 via the input / output unit 103, the document information can be read. The encryption information of the specific area is
And can be replaced with the decrypted partial document information for display. At this time, the decryption unit 102 performs a process of prohibiting copying or editing of the decrypted partial document information of the designated area, and displays it. For this reason, it is not possible to modify the contents of the designated area by cut-and-paste or any other editing operation, write it to another document, or quote it in another document.

The document information encrypted in this document processing system is configured as shown in FIG.
The document information shown in FIG. 3 includes management information including a management table and text information including text data including encryption information.

The management table stores address information indicating the position of the designated area encrypted in the document information and key information relating to the key used for encryption. Document information is managed using the information. The body data that constitutes the body information is
Only the designated area indicated by the management information is the document information replaced with the encryption information, and the text data is written / read or transmitted together with the management information described above.

That is, the document information has a structure as shown in FIG. 3 which is handled as, for example, one file.
The management table contains address information ADR1, ADR2, and ADR3, and key information KEY corresponding to each of them.
1, KEY2 and KEY3 are stored.
The body data includes encrypted information EP1, EP2, and EP3 in which the designated area is encrypted. The address information ADR1, ADR2, and ADR3 indicate the designated areas, that is, the positions of the encryption information EP1, EP2, and EP3. Key information KEY1, KEY2 and KE
Y3 is encryption information EP1, EP2, and EP3, respectively.
For example, key information necessary for decryption using a decryption key or the like.

Next, the operation of the document processing system according to the embodiment of the present invention will be described with reference to the flowcharts shown in FIGS. First, FIG. 4 shows a flow of a document creation process at the time of document creation. First, a user inputs a document to be processed by the encryption unit 101, that is, the document creation unit 11 of the encryption unit 1 via the operation terminal 105 and the input / output unit 103, and creates a required document. (Step S11). Next, an area to be kept secret in the document information input and created by the user is specified in the area specifying unit 12.
Is selected and designated by the user (step S1).
2).

The encryption processing unit 13 encrypts the partial document information in the designated area to obtain encrypted information (step S).
13). Then, the management information generation unit 14 stores the address information of the designated area and the key information related to the encryption in the management table, and generates the management information (step S14).
Lastly, the management information generation unit 14 causes the encryption processing unit 13 to replace the target area in the text of the document information, that is, the designated area, with the encryption information and transmit or store the same with the management information (step S15).

FIG. 5 shows the flow of the document display process when displaying a document. First, the decryption unit 102, that is, the decryption processing unit 22 of the decryption unit 2 extracts the management information of the document information including the received or read encryption information and supplies the management information to the management information processing unit 23. Then, the decryption processing unit 22 is preset in the content of the key information of the management table provided from the management information processing unit 23 and the decryption key supply unit 21, or is input by the viewer via the operation terminal 105 and the input / output unit 103. The encrypted information part of the document information is decrypted based on the decryption key thus obtained (step S21).

Next, based on the address information in the management table of the management information processing section 23, the decryption processing section 22 replaces the encrypted information of the target area, that is, the designated area, with the partial document information decrypted and decrypted (step S22). . Then, based on the control of the management information processing unit 23, the editing prohibition processing unit 24
Prohibits editing operations such as copying or pasting of partial document information in the designated area (step S23), and
5 on the display screen (step S2
4).

As described above, only the portion of the document information that requires confidentiality is encrypted. Therefore, management information for managing the position of the confidential portion in the document information is added. When browsing the document information, the encrypted portion is decrypted and provided for display. Even in such a case, edit processing such as copy or paste is prohibited for the encrypted portion, so that the confidential portion cannot be leaked.

In this way, even when the document information is leaked, the information of the truly secret part is protected by encryption so as not to leak. Further, by designating a confidential part in the document information and performing the editing prohibition process, leakage of the confidential information in the document due to editing operations such as copying or pasting is also prevented.

Therefore, the object of encryption / decryption can be limited to only necessary parts, so that the processing time can be effectively reduced. Also, regarding the document information after decryption and decryption, since the designated part of the document information is managed whether or not it is confidential, it is possible to prevent editing such as copying or pasting of the part which should be truly confidential. It is possible to effectively prevent leakage / outflow of secret information.

The above-described embodiment of the present invention
For example, it can be applied to an in-house document management system, etc.
Processing when applied to an in-house document management system is as follows. The document creator inputs a new document in accordance with the above-described document creation process, and designates a secret area in the document information. The in-house document management system including the document processing system according to the present invention encrypts a specified area and replaces the partial document information of the area before encryption with the encrypted information, so that a document of a part that does not require secret is encrypted. The document information is generated in plain text with respect to the information, and the encrypted document information is generated with respect to the portion requiring secrecy.

When another person wants to view the document information, an attempt is made to decrypt the encrypted portion.
At this time, a key for decryption is requested from the user, and decryption is performed using the input key. Then, if the decryption is successful, the decrypted document is displayed, and if the decryption is unsuccessful, a message indicating that the corresponding area is encrypted is displayed.

It should be noted that the document processing system of the present invention can be realized by using an ordinary computer system without configuring as a dedicated system. For example,
By installing the program from a medium (a floppy disk, a CD-ROM, or the like) storing a program for executing the above-described operation in the computer system, a document processing system that executes the above-described processing is constructed. be able to. By installation,
The program is stored in a medium such as a hard disk in a computer system, configures a document processing system, and is provided for execution. In addition, the medium for supplying the program to the computer is not limited to a storage medium in a narrow sense, such as a communication line, a communication network, and a communication system.
It may be a storage medium in a broad sense including a communication medium for temporarily and fluidly holding information such as a program.

For example, the program may be registered in an FTP (File Transfer Protocol) server provided on a communication network such as the Internet and distributed to an FTP client via the network, or a bulletin board (BBS: Bulletin) of the communication network may be used. The program may be registered in a board system or the like and distributed via a network. Then start this program and run the OS
The above processing can be achieved by executing under the control of the (Operating System). Furthermore, the above-described processing can also be achieved by starting and executing the program while transferring the program via the communication network.

[0053]

As described above, according to the present invention, it is possible to quickly and appropriately process document information that requires confidentiality, to clarify the confidential part of the confidential document information, It is possible to provide a document processing system, a method, and a recording medium that enable appropriate security management by a provider.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a basic configuration of a document processing system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining an example of a specific configuration of the document processing system of FIG. 1;

FIG. 3 is a schematic diagram for explaining a specific example of a format of stored or transmitted document information in the document processing system of FIG. 1;

FIG. 4 is a flowchart illustrating a document creation process in the document processing system of FIG. 1;

FIG. 5 is a flowchart illustrating a document display process in the document processing system of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 encryption unit 2 decryption unit 11 document creation unit 12 area designation unit 13 encryption processing unit 14 management information generation unit 21 decryption key supply unit 22 decryption processing unit 23 management information processing unit 24 editing prohibition processing unit 25 display processing unit 100 document Processing system 101 Encryption unit 102 Decryption unit 103 Input / output unit 104 Control unit 105 Operation terminal 106 File storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B009 TA11 TB13 VA11 VC02 5B017 AA06 AA07 BA07 BB02 CA16 5J104 AA01 CA02 EA02 EA17 NA02 NA22 PA14

Claims (11)

[Claims] 1. An area designating means for designating one or more specific areas in document information, and information of a specific area designated by the area designating means is encrypted, and original information is added to the encrypted information. A partial encryption unit that replaces the contents of the specific area of the document information; and information about the specific area specified by the area specification unit and management information related to an encryption key in the partial encryption unit. A management information generating means for adding to the encrypted document information processed by the encrypting means. 2. The information of a specified specific area is encrypted,
The content of the specific area of the original document information is replaced with the encrypted information, and the encrypted document information to which the information on the specific area and the management information on the encryption key are added is processed. A system for decrypting information of the specific area of the encrypted document information to which the management information is added based on a separately provided decryption key, and identifying the decrypted information with the identification of the encrypted document information. A document processing system comprising: a partial decoding unit that replaces area information; and a document information display unit that displays document information processed and decrypted by the partial decoding unit. 3. An editing prohibition unit for performing a process of prohibiting editing of the decipherment information of the specific area of the document information processed and deciphered by the partial decoding unit, and providing the display for display by the document information display unit. 3. The document processing system according to claim 2, further comprising: 4. An area designating means for designating one or more specific areas in the document information; and encrypting information of the specific area designated by the area designating means, and adding the original information to the encrypted information. A partial encryption unit that replaces the contents of the specific area of the document information; and information about the specific area specified by the area specification unit and management information related to an encryption key in the partial encryption unit. Management information generating means for adding to the encrypted document information processed by the encryption means; and decoding the information in the specific area of the encrypted document information to which the management information is added, based on a separately provided decryption key. A partial decryption unit that replaces the decryption information with information of the specific region of the encrypted document information; and prohibits editing of decryption information of the specific region of the document information processed and decrypted by the partial decryption unit. A document processing system comprising: an edit prohibition unit that performs a process of performing the above-described processing; and a document information display unit that displays the document information that has been subjected to the process of prohibiting the editing by the edit prohibition unit. 5. An area specifying step for specifying one or more specific areas in the document information; a partial encryption step for encrypting information of the specific area specified in the area specifying step; An encryption replacement step of replacing the content of the specific area of the original document information with the encrypted information; information about the specific area specified in the area specifying step; and an encryption key in the partial encryption step A management information generating step of generating management information related to the management information, and a management information adding step of adding the management information generated in the management information generating step to the encrypted document information processed in the encryption replacing step. A document processing method characterized by the following. 6. The information of a designated specific area is encrypted,
The content of the specific area of the original document information is replaced with the encrypted information, and the encrypted document information to which the information on the specific area and the management information on the encryption key are added is processed. In doing so, based on a separately provided decryption key, a partial decryption step of decrypting the information of the specific area of the encrypted document information to which the management information is added, and the decryption information decrypted by the partial decryption step A document processing method, comprising: a decryption / replacement step of replacing the encrypted document information with information of the specific area; and a document information display step of displaying the document information processed in the decryption / replacement step. 7. A process in which decoding of the document information in the specific area of the document information that has been processed and decoded in the partial decoding step and replaced in the decoding and replacing step is performed, and displayed in the document information displaying step. 7. The method according to claim 6, further comprising the step of:
Document processing method described in. 8. An area specifying step of specifying one or more specific areas in the document information; a partial encryption step of encrypting information of the specific area specified in the area specifying step; An encryption replacement step of replacing the content of the specific area of the original document information with the encrypted information; information about the specific area specified in the area specifying step; and an encryption key in the partial encryption step A management information generating step of generating management information related to the management information, and a management information adding step of adding the management information generated in the management information generating step to the encrypted document information processed in the encryption replacing step. A partial decryption step for decrypting the information of the specific area of the encrypted document information to which the management information has been added, based on the decryption key thus obtained. A decryption replacement step of replacing the decrypted information decrypted by the partial decryption step with information of the specific area of the encrypted document information; and a processing and decryption process performed in the partial decryption step, and a replacement performed by the decryption replacement step. A prohibition processing step of performing a process of prohibiting the decoding of the decrypted information of the specified document information in the specific area; and a document information display step of displaying the document information processed in the prohibition processing step. Document processing method. 9. A computer, comprising: an area specifying unit that specifies one or more specific areas in document information; encrypts information of a specific area specified by the area specifying unit; And partial encryption means for replacing the content of the specific area of the document information, and information about the specific area specified by the area specifying means and management information regarding the encryption key in the partial encryption means, A computer-readable recording medium storing a program for functioning as management information generating means for adding to the encrypted document information processed by the partial encryption means. 10. A computer according to claim 1, wherein information of the specified specific area is encrypted, and the contents of said specific area of the original document information are replaced with said encrypted information. In a system for processing encrypted document information to which information and management information related to the encryption key are added, based on a separately provided decryption key, the specific area of the encrypted document information to which the management information is added is specified. Partial decryption means for decrypting information and replacing the decrypted information with the information of the specific area of the encrypted document information, and document information display means for displaying the document information processed and decrypted by the partial decryption means, A computer-readable recording medium on which a program for functioning as a computer is recorded. 11. A computer, comprising: area designation means for designating one or more specific areas in document information; encrypting information of a specific area designated by the area designation means; A partial encryption unit that replaces the content of the specific area of the document information with the information about the specific area specified by the area specifying unit and management information about an encryption key in the partial encryption unit; Management information generating means for adding to the encrypted document information processed by the partial encryption means, based on a separately provided decryption key, for decoding the information in the specific area of the encrypted document information to which the management information has been added A partial decryption unit that replaces the decryption information with information of the specific region of the encrypted document information; and a decryption information of the specific region of the document information processed and decrypted by the partial decryption unit. A computer-readable program storing a program for functioning as editing prohibiting means for performing a process of prohibiting collection of documents, and document information displaying means for displaying the document information on which the processing of prohibiting editing has been performed by the editing prohibiting means. recoding media.