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  Digital document management system, digital document management method, and digital document management programRelated Patent Categories: Electrical Computers And Digital Processing Systems: Support, Multiple Computer Communication Using Cryptography, Particular Communication Authentication Technique, Authentication By Digital Signature Representation Or Digital WatermarkThe Patent Description & Claims data below is from USPTO Patent Application 20070168671. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a digital document management system or the like that manage document information including digital information and, more particularly, to a digital document management system, a digital document management method, and a digital document management program which are applied to digitization, distribution, storage of a document that needs weight of evidence as heavy as that a paper document provides and which are capable of easily identifying a corrected part in digital document information involving a partial correction (including, e.g., addition, change, deletion, sanitizing), guaranteeing the validity of the correction, and performing a third-party certification of the correction. [0003] 2. Description of the Related Art [0004] As a prior art, a correction method and verification method of the validity of the correction used in a paper document will firstly be described. [0005] Conventionally, as a representative correction method for use in performing correction for a paper document, there is known a method as shown in FIG. 69. That is, the method includes: crossing out characters to be corrected with a double line and entering proper characters in the space immediately above the correction (P1), putting signatures (initials) of both parties thereto (P2). Note that, in drawings, hereinafter, where the correction is made with a seal (name in a circle), this means the above correction method, that is, it corresponds to putting signatures of both parties thereto. [0006] It is possible to guarantee/confirm the following points by conducting the above P1 and P2 in the conventional correction method for a paper document. [0007] (1) Capable of easily confirming/identifying a corrected part, as well as capable of confirming that any other part than the corrected part includes no deliberate or negligent change. [0008] (2) Capable of easily confirming/identifying corrected area. [0009] (3) Capable of easily confirming a person who has made the correction. [0010] (4) Capable of confirming whether the corrected part is a correctable part. [0011] (5) Capable of confirming the original before correction. [0012] (6) Capable of making a correction and verifying the correction according to a policy (control information) related to corrections. [0013] Similarly, it is possible to guarantee/confirm the following points in the conventional correction method for a paper document with carbon-copied paper used for an insurance application form, transportation order form, or the like. [0014] (7) Capable of partially hiding the document, as well as confirming that any other part than the hidden part includes no change. [0015] (8) Capable of confirming the identity between a base paper and carbon-copied paper by comparing handwritings on respective papers. [0016] (9) Capable of detecting falsification of document by separately storing the base paper and carbon-copied paper. [0017] (10) Capable of performing a third-party certification related to the content of the document, even if being brought in court case, according to (9). [0018] (11) The base paper and carbon-copied paper can be distributed as needed. In some cases, they can independently be distributed of each other. [0019] As described above, a correction method and a method of certificating the validity of the correction in a paper document are excellent in various points. Meanwhile, along with recent advancement in IT technology, a technique that handles digital data (digital information) in place of the above paper document in view of convenience of data handling and data storage has been proposed (refer to, e.g., Jpn. Pat. Appln. Laid-Open Publications Nos. 2000-285024, 2001-117820, and 2003-114884, Paper of Information Processing Society of Japan/Computer Security Group (CSEC) "Digital document sanitizing problem (2003/7/17) (2003-CSEC-22-009)", and Paper of SCIS2004 "A Digital Document Sanitizing Scheme with Disclosure Condition Control"). [0020] The above publications Nos. 2000-285024 and 2001-117820, which relate to a technique of storing the original of a digital document, propose techniques that give the properties that the original document (paper document) has to digital information and protect the digital document from being falsified. That is, these techniques focus that a mechanism for storing and managing a digital document of the final fixed version as an original document, that is, the storage location of the original document is made evident and focus how safely the original documents accumulated within an organization are stored. [0021] However, in such an original document storage technique, even when only minor corrections are made for a digital document, it is regarded as "falsification". For example, in the case of the abovementioned "corrections for paper agreement document", a correction procedure of "crossing out word to be corrected with a double line, entering corrected word in the space immediately above the correction, and putting signatures of both parties". In this case, even after corrections have been made for the paper agreement document, it is regarded as an original document. [0022] The above correction procedure in a paper society is publicly judged to be valid and therefore the corrections made can be confirmed through a third-party certification. [0023] On the other hand, in the case, even if the conventional original document storage technique, a problem that it is impossible to determine whether corrections are "falsification" or "proper change". This can also be explained from the current feature of a digital signature which can detect every change made for a digital document. Continue reading... Full patent description for Digital document management system, digital document management method, and digital document management program Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Digital document management system, digital document management method, and digital document management program patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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