JP2009020618A - Document information editing device, document information editing method, document information editing program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the browsing of document information before editing when editing the document information while holding the document information before editing. <P>SOLUTION: This document editing server 1 for generating the document information after editing while storing information before editing is provided with a document editing part 103 for acquiring the document information before editing and the document information after editing, and for embedding the document information before editing in the acquired document information after editing. The document editing part 103 is characterized by embedding the document information before editing as visible information when the document information after editing is shown by the function of an application exclusive for browsing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a document information editing apparatus, a document information editing method, a document information editing program, and a recording medium, and more particularly to a method for editing document information while retaining information before editing.

  In recent years, there has been a tendency to digitize information, and image forming apparatuses such as printers and facsimiles and image processing apparatuses used for outputting digitized information have become indispensable devices. Examples of the format of image information that can be processed by such an image processing apparatus include document information in PDF (Portable Document Format) format. For such document information, digital signatures and time stamps are applied to identify the information creator, verify the validity of the contents, and verify the information creation time.

  Proof information by time stamp is generated by, for example, encrypting a hash value obtained from document information to be proved and time information generated by a valid third party with a secret key of a public key cryptosystem. Is done. When verifying the information, since the certification information can be decrypted with the public key, the validity of the time information is confirmed, and the information creation time is proved. Further, since the hash value generated from the document information to be proved matches the hash value decrypted with the public key, it is possible to confirm the validity of the document information and whether or not the document information has been tampered with (original guarantee).

On the other hand, when editing and updating document information, there is a method of adding update information (incremental information) while leaving the original document information (see, for example, Patent Document 1). According to the method of Patent Document 1, even when document information is edited, the original document information that is guaranteed to be original remains without being lost or altered. Therefore, even when document information is edited, it is possible to perform original guarantee using a hash function.
Japanese Patent Laid-Open No. 10-247191

  When the document information such as the PDF format is visually displayed, a plurality of pieces of information are assembled according to a predetermined format to be configured as a visually displayed electronic document. Here, a general-purpose browsing-only application such as ADOBE READER (registered trademark) generally has only a function of displaying an electronic document that is finally configured. Therefore, when the incremental update method disclosed in Patent Document 1 is used, the original document information that is guaranteed to be original is not visually displayed (not visible) when displayed by the viewing-only application (not visible). Invisible information) is generally used. In addition, when the electronic document is printed out, the original document information is not printed out, so that it cannot be visually recognized.

  Here, there is a method of browsing the document information at the time when the electronic signature or the time stamp is applied by the function of the above-mentioned viewing-dedicated application, but this displays the document information at the time when the electronic signature or the time stamp is applied. Therefore, it is not always possible to acquire document information before editing. Even if the document information before editing is digitally signed, time stamped, etc., it is still possible to display the document information before editing in an application that does not support such functions. Impossible. In addition, in order for the user to obtain document information before editing by a viewing-only application using such a function, the document information is returned after the electronic signature, time stamp, etc. are applied. Troublesome operations such as saving were necessary.

  Such a problem is not limited to the document information in the PDF format, but when the original document information is edited, the document information before the editing becomes a general-purpose browsing application, OS (Operating System), or the like. Similarly, it may be a problem in the case of quasi-invisible information that is not displayed by the function of the basic software.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to facilitate browsing of document information before editing when document information is edited while retaining document information before editing.

  In order to solve the above problem, the invention described in claim 1 is a document information editing apparatus that generates document information after editing while retaining the information before editing, and acquires the document information before editing. An original document information acquisition unit; an edited document information acquisition unit that acquires edited document information; and a document information processing unit that associates the acquired document information with the edited document information. The information processing unit associates the document information before editing with the document information after editing as information that can be displayed by a function of a viewing-dedicated application.

  The document information editing apparatus according to claim 1, wherein the document information processing unit edits the document information before editing as an attached file that can be acquired by the browsing-dedicated application. It is characterized by being associated with later document information.

  The invention according to claim 3 is the document information editing apparatus according to claim 1 or 2, wherein the document information processing unit uses the document information before editing as annotation information recognizable by the browsing-dedicated application. The document information is associated with the edited document information.

  According to a fourth aspect of the present invention, in the document information editing apparatus according to any one of the first to third aspects, the document information processing unit includes the edited document of the pre-edited document information. Information corresponding to information changed in the information is associated with the edited document information.

  The document information editing apparatus according to claim 1, wherein the document information before editing includes page information when the document information is output on paper, and the document information processing The section associates page information of the document information before editing with the document information after editing.

  The document information editing apparatus according to claim 5, wherein the document information before editing includes a plurality of page information, and the document information processing unit includes the plurality of pages. Of the information, page information changed in the edited document information is associated with the edited document information.

  The invention according to claim 7 is the document information editing apparatus according to claim 6, wherein the document information processing unit is configured to edit the edited document among a plurality of page information included in the document information before editing. The page information changed in the information is associated with the page information immediately before or after the corresponding page information in the edited document information.

  The invention according to claim 8 is the document information editing apparatus according to claim 5, wherein the document information processing unit associates all page information of the document information before editing with the document information after editing. It is characterized by.

  The invention according to claim 9 is the document information editing apparatus according to any one of claims 1 to 8, wherein the document information processing unit stores metadata for managing document information before editing after the editing. It is related to the document information.

  The invention described in claim 10 is a document information editing method for generating document information after editing while retaining the information before editing. The document information before editing is acquired, and the document information after editing is obtained. Acquiring and associating the document information before editing with the document information after editing as information that can be displayed by a function of a dedicated viewing application.

  The invention described in claim 11 is a document information editing program, which causes the document information editing apparatus to execute the document information editing method described in claim 10.

  The invention described in claim 12 is a recording medium, wherein the document information editing program according to claim 11 is recorded in a format readable by the document information editing apparatus.

  According to the present invention, when editing document information while retaining the document information before editing, it is possible to facilitate browsing of the document information before editing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In this embodiment, a document management system in which various document information is stored in a document management server and arbitrary document information is downloaded from a client terminal via a network will be described as an example. In this embodiment, PDF data is used as an example of document information. That is, in the present embodiment, description will be made using PDF data as an example of image information that does not include display or print output. FIG. 1 is a block diagram illustrating the document management system according to the present embodiment. As shown in FIG. 1, the document management system according to this embodiment includes a document management server 1, a host device 2, and a host device 3. The document management server 1 is a server that stores and manages various types of document information. The host device 2 and the host device 3 are information processing terminals operated by a user, and are realized by a PC (Personal Computer) or the like. As shown in FIG. 1, the document management server 1, the host device 2, and the host device 3 are connected to each other via a LAN (Local Area Network) or the like. The host device 2 and the host device 3 can download and use document data stored in the document management server 1 via a network.

  FIG. 2 is a block diagram illustrating the configuration of the document management server 1 according to the present embodiment. The document management server 1 according to this embodiment includes a document database 101, a communication control unit 102, a document editing unit 103, and a document analysis unit 104. The document database 101 is a database that stores and manages document information. Document information stored in the document database 101 is read in response to a request from the host device 2 or the host device 3. The communication control unit 102 controls communication between the document management server 1, the host device 2, and the host device 3 via the network. The document editing unit 103 edits the document information read from the document database 101 in accordance with instructions from the host device 2 and the host device 3. The document analysis unit 104 analyzes document information edited by the document editing unit 103 and detects the presence or absence of an electronic signature, a time stamp, and the like.

  The document editing unit 103 and the document analysis unit 104 are configured by a combination of software and hardware. Specifically, a control program such as ROM (Ready Memory), EEPROM (Electronically Erasable and Programmable ROM), and firmware stored in a non-volatile recording medium such as a magnetic disk or an optical disk is a DRAM (Dynamic Random Access Memory). The software control unit is loaded into a volatile memory (hereinafter referred to as a memory), and is configured according to the control of a CPU (Central Processing Unit) and hardware such as an integrated circuit.

  Next, information included in the document database 101 according to the present embodiment will be described. FIG. 3 is a diagram showing information stored in the document database 101. As shown in FIG. 3, the document database 101 includes document information used by the host apparatus 2 via the network, electronic signature information of the document information, time stamp information, and a document management database. The electronic signature information shown in FIG. 3 is generated by calculating a hash value of the corresponding document information and encrypting the hash value with a secret key in the public key cryptosystem. Here, the secret key used for encrypting the hash value may be the secret key of the creator of the corresponding document information, or may be a secret key unique to the document management server 1.

  Next, a document management database included in the document database 101 shown in FIG. 3 will be described with reference to FIG. As shown in FIG. 4, the document management database includes an ID for uniquely identifying document information stored in the document database 101, a title of corresponding document information, creation of document information, update date and time, an electronic signature, and a time stamp. Has information on presence or absence. The document information title is a file name of the document information or a title as a document of the document. The creation and update date and time of document information are the date and time when the document information was created and the date and time when it was last edited. The presence / absence of an electronic signature or a time stamp indicates whether an electronic signature or a time stamp has been generated for the document information. The user searches and refers to the document information based on all or part of the information stored in the document management database. The retrieval of the document information stored in the document database 101 is realized by an application provided in the host device 2 or the host device 3 or an application provided by the document management server 1. In such a document management system, this embodiment is characterized by an editing method when document information stored in the document database 101 is edited.

  Next, the operation of the document management server 1 according to the present embodiment will be described with reference to FIG. FIG. 5 is a sequence diagram illustrating processing when the host device 2 and the host device 3 access the document management server 1 and edit document information stored in the document database 101 in the document management system according to the present embodiment. It is. In FIG. 5, a case where the host apparatus 2 downloads and uses document information from the document management server 1 will be described as an example, but the same applies to the host apparatus 3. When an application running on the host device 2 edits the document information downloaded from the document management server 1 (S501) and instructs the storage to the document management server 1, the editing information is sent from the host device 2 to the document management server 1. It is transmitted (S502). In the editing information transmission in S502, all the edited document information may be transmitted, or the ID of the document information to be edited shown in FIG. 4 is specified, and the editing content to be added to the document information is transmitted. May be. In addition, the editing information transmitted in S502 includes information indicating whether or not the original document information is retained when the document information is transmitted, that is, whether or not the original document storage mode is set.

  The editing information transmitted by the host device 2 is input to the communication control unit 102 and transferred to the document analysis unit 104 (S503). The document analysis unit 104 that has received the editing information from the communication control unit 102 determines a method for editing the document information to be edited (S504). The contents determined here are whether or not to leave the original document information when editing the document information, and in what format to leave the original document information. Thereafter, the document analysis unit 104 transmits the determination result in S504 to the document editing unit 103 (S505). Upon receiving the notification from the document analysis unit 104, the document editing unit 103 reads the document information to be edited from the document database 101 (S506). That is, the document editing unit 103 functions as an original document information acquisition unit. Then, the document editing unit 103 edits the document information according to the editing information received from the host device 2 and the editing method determined by the document analysis unit 104 (S507). That is, the document information editing unit 103 functions as an edited document information acquisition unit that acquires document information after editing. This editing method will be described in detail later. When the editing of the document information is completed, the document editing unit 103 stores the edited document information in the document database 101 and ends the process (S508).

  Next, operations of the document analysis unit 104 and the document editing unit 103 in the document information editing operation shown in FIG. 5 will be described with reference to FIG. Upon receiving the editing information (S601), the document analysis unit 104 analyzes the document information (S602). As a result of the analysis in S602, when the document editing mode is the original document storage mode (S603 / YES), the document analysis unit 104 notifies the document editing unit 103 to that effect, and the document editing unit 103 edits from the document database 101. The target document information is read (S604). Then, the document editing unit 103 generates edited document information according to the editing information received from the host device 2, and attaches the original document information before editing to the generated edited document information (S605). That is, the document editing unit 103 functions as a document information processing unit. The method of attaching the original document will be described in detail later. When the generation of the edited document information is completed, the document editing unit 103 stores the edited document information in the document database 101 (S606), and ends the process.

  On the other hand, as a result of the analysis in S602, when the document editing mode is not the original text saving mode (S603 / NO), the document analysis unit 104 notifies the document editing unit 103, and the document editing unit 103 receives the editing target from the document database 101. Document information is read (S607). Then, the document editing unit 103 generates edited document information according to the editing information received from the host device 2 (S608). At this time, unlike S605, the document editing unit 103 generates document information including only the edited document information. When the generation of the edited document information is completed, the document editing unit 103 stores the edited document information in the document database 101 (S606), and ends the process.

  Next, generation of document information after editing with the original document information attached in S605 of FIG. 6 will be described with reference to FIGS. FIG. 7A is a diagram showing a structure of general PDF data. As shown in FIG. 7A, the PDF data has a hierarchical structure including a plurality of objects such as a Catalog object, a PageTree object, and a Page object. Among these objects, the Page object indicates the contents of each page in the document information, that is, information on each page when the document information is output on paper. In addition to information indicating the contents of each page, the Page object includes an annotation object, a thumbnail of each page, and the like. A Catalog object is arranged at the top of the hierarchical structure of the PDF data. This Catalog object holds setting values representing the entire document. The PageTree object is arranged as a lower layer object of the Catalog object. The PageTree object is an intermediate object for managing the Page object, and holds common setting values such as a Page object arranged in a lower layer.

  FIG. 7B is a diagram showing an example of a method for attaching the pre-variation PDF data to the edited PDF data. In the example of FIG. 7B, the original document information before editing is attached as an annotation object arranged below the Page object. The Page object to which the annotation object is attached is a Page object related to a page whose contents have been changed from the original document information. That is, for the Page object related to the page whose contents have been changed, the contents of the page before the contents are changed are added as annotation information. Thus, when browsing the edited document information, the user can know the contents of the page before the change as an annotation by referring to the annotation object of the page whose content has been changed. Incidentally, in document information such as PDF format, a general browsing-only application has a function of referring to information inserted as an annotation object as shown in FIG.

  FIG. 7C is a diagram showing another example of a method for attaching the pre-variation PDF data as an attached file to the edited PDF data. In the example of FIG. 7C, the document information before editing is held in the Catalog object as an attached file. When attaching the original document information, for the Page object related to the page whose contents are changed, the document information having only the Page object related to the page before the contents may be attached, or before the contents are changed. All the document information may be attached as it is. Thereby, when browsing the document information after editing, the user can know the contents of the document information before being changed by referring to the document information before editing attached to the document information. In document information such as the PDF format, a general browsing-only application has a function of referring to information attached to the document information.

  FIG. 7D is a diagram illustrating an example in which metadata is further added to the example of FIG. As shown in FIG. 7D, document information in PDF format can hold metadata in units of documents. An example of such metadata is shown in FIG. As shown in FIG. 8, metadata added to document information in PDF format is described in XMP format. Information defined by an application that processes the document information can be embedded in the metadata. That is, when document information before editing is attached to document information after editing, management of the attached document information can be managed by the metadata.

  As described above, in the document management system and the document information editing method according to the present embodiment, when editing document information, information before editing is added in a format that can be browsed and referred to by a viewing-only application. Thus, it is possible to facilitate browsing of document information before editing. Conventionally, by storing edit content information in original document information, it is possible to express the document information after editing and roll back to the document information before editing. In such a case, an application having a function of deleting the editing content information stored in the document information and rolling back the document information to a state before editing is necessary. On the other hand, in this embodiment, since the document information before editing is added to the document information after editing, it is not necessary to perform the process such as the rollback, and the document information before editing can be easily acquired. Is possible.

  In the above description, an example has been described in which the host device 2 designates whether or not to hold the original document information and transmits the editing information to the document management server 1. That is, it is typically specified by the user who operates the host device 2 whether or not to retain the document information before editing in the generation of the document information after editing. In addition, the document analysis unit 104 may determine whether to hold the document information before editing based on other information. For example, the document analysis unit 104 accesses the document database 101 in step S504 in FIG. 5 and confirms whether or not an electronic signature or a time stamp is applied to the document information to be edited. As a result, if an electronic signature or a time stamp is applied, it is determined that the original document information needs to be stored, and the document information before editing is stored when generating the document information after editing. On the other hand, if the electronic signature or time stamp is not applied to the document information to be edited, it is determined that it is not necessary to store the original document information. This eliminates the need for the user to specify whether or not to save the original document when editing the document information.

  In the above description, the document management system as shown in FIG. 1 is taken as an example, and an example in which the document management server 1 edits document information according to the editing information received from the host device 2 and the host device 3 has been described. . However, the above-described document editing method by the document management server 1 can be realized by the host device 2 and the host device 3 (hereinafter referred to as host device). For example, this can be realized by providing a document information editing application running on the host device with functions corresponding to the document editing unit 103 and the document analysis unit 104 shown in FIG. In this case, the document information before editing is stored in the storage medium of the host device, and when the user decides to edit the document information, the document information before editing is read from the storage medium of the host device, and the edited document information is stored. Attach to document information. In addition, it can be read from a document management server connected to the network as in the above embodiment.

  In the first embodiment, as illustrated in FIGS. 7B to 7D, the example in which the document information before editing is held as an annotation object attached to the Page object or attached information attached to the Catalog object has been described. In addition, for example, the document information before editing can be attached to the document information after editing as a new Page object. That is, the information for each page included in the document information before editing is embedded in the document information after editing as new page information. Such an example will be described with reference to FIGS. FIG. 8A shows the original document information before editing. The document information shown in FIG. 8A includes PageA, PageB, and PageC as Page objects. As shown in FIG. 8B, when such document information is edited to document information including PageA, PageB ′, and PageC, that is, when the PageB object is edited into a PageB ′ object. think of.

  As an example of such a case, as shown in FIG. 8C, an unedited PageB object indicated by a double line box in FIG. 8C is added after the edited PageB ′ object. can do. As another example, as shown in FIG. 8 (d), a page object consisting of PageA, PageB, and PageC, which is all document information before editing, is placed behind a Page object composed of PageA, PageB ', and PageC after editing. Objects can also be added. As a result, when the edited document information is browsed with a viewing-only application, the edited contents and editing as normal page information without using the annotation function or the attached information function as described in the first embodiment. The previous contents can be browsed, and the contents of the original document can be browsed more easily.

  In the above description, the example in which the PageB object before editing is embedded immediately after the PageB ′ object changed in the document information after editing in FIG. 8C has been described, but it may be embedded immediately before. Further, the layout of the page corresponding to the edited PageB ′ object may be divided and embedded so as to include both the PageB ′ and PageB objects.

It is a figure which shows the document management system which concerns on the Example of this invention. It is a block diagram which shows the whole structure of the document management server based on the Example of this invention. It is a figure which shows the information contained in the document database based on the Example of this invention. It is a figure which shows the information contained in the document management database based on the Example of this invention. It is a sequence diagram which shows the document information editing operation | movement which concerns on the Example of this invention. 5 is a flowchart illustrating a document information editing operation according to an embodiment of the present invention. It is a figure which shows the structure before and behind the edit of the document information based on the Example of this invention. It is a figure which shows the example of the information added to the document information after edit which concerns on the Example of this invention. It is a figure which shows the structure before and behind the edit of the document information which concerns on the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Document management server 2, 3 Host apparatus 101 Document database 102 Communication control part 103 Document edit part 104 Document analysis part

Claims (12)

A document information editing apparatus for generating document information after editing while retaining information before editing,
An original document information acquisition unit for acquiring document information before editing;
An edited document information acquisition unit for acquiring edited document information;
A document information processing unit that associates the document information before editing with the acquired document information after editing,
The document information editing apparatus, wherein the document information processing unit associates the document information before editing with the document information after editing as information that can be displayed by a function of a viewing-dedicated application.   The document information editing apparatus according to claim 1, wherein the document information processing unit associates the document information before editing with the document information after editing as an attached file that can be acquired by the browsing-dedicated application.   The document information editing unit according to claim 1, wherein the document information processing unit associates the document information before editing with the document information after editing as annotation information recognizable by the browsing-only application. apparatus.   The document information processing unit associates information corresponding to information changed in the document information after editing, among the document information before editing, with the document information after editing. 4. The document information editing apparatus according to any one of items 3 to 3. The document information before editing includes page information when the document information is output on paper,
The document information editing apparatus according to claim 1, wherein the document information processing unit associates page information of the document information before editing with the document information after editing. The document information before editing has a plurality of page information,
6. The document information according to claim 5, wherein the document information processing unit associates page information changed in the edited document information among the plurality of page information with the edited document information. Editing device.   The document information processing unit is configured to display page information changed in the edited document information among a plurality of page information included in the document information before editing, immediately before the corresponding page information in the edited document information. The document information editing apparatus according to claim 6, wherein the document information editing apparatus is associated with page information immediately after the page information.   The document information editing apparatus according to claim 5, wherein the document information processing unit associates all page information of the document information before editing with the document information after editing.   The document information editing apparatus according to claim 1, wherein the document information processing unit associates metadata for managing document information before editing with the document information after editing. A document information editing method for generating document information after editing while retaining the information before editing,
Get document information before editing,
Get the document information after editing,
A document information editing method, wherein the document information before editing is associated with the edited document information as information that can be displayed by a function of a viewing-dedicated application.   A document information editing program that causes a document information editing apparatus to execute the document information editing method according to claim 10.   12. A recording medium in which the document information editing program according to claim 11 is recorded in a format readable by a document information editing apparatus.

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