Digital document management system, digital document management method, and digital document management program

• US 20070050713A1
• Filed: 10/18/2006
• Published: 03/01/2007
• Est. Priority Date: 07/20/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yoshioka, Takashi, Takenaka, Masahiko
• Granted Patent: US 8,091,015 B2
• Time in Patent Office: Days
• US Class Current: 715/229
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G06F 40/166 Editing, e.g. inserting or deleting
• CPC Class Codes: G06F 40/197 Version control for software G06F8/71
• CPC Class Codes: G06Q 10/10 Office automation; Time management

Abstract

Disclosed is a digital document management system and the like capable of guaranteeing that a partial correction has been made according to a proper procedure and achieving a third-party certification of the validity of the guarantee.

A digital document management system that manages document information created in a digital form, comprising: a partial identification information generation section 51 that generates partial identification information that represents, in an identifiable manner, respective parts of the document information; a partial correction information generation section 52 that generates partial correction information which is information related to a correction history of a corrected part in the case where any correction has been required for the document information; and an original document information management section 40 that manages the document information, partial identification information, partial correction information, and prescribed policy information in an associated manner.

Claims

1. A digital document management system that manages document information created in a digital form, comprising:

a policy information storage section that stores previously defined policy information;

a partial identification information generation section that generates partial identification information that represents, in an identifiable manner, respective parts of the document information;

a partial correction information generation section that generates partial correction information which is information related to a correction history of a corrected part in the case where any correction has been required for the document information;

a management section that manages the document information, partial identification information generated by the partial identification information generation section, partial correction information generated by the partial correction information generation section, and policy information stored in the policy information storage section in an associated manner; and

a registration document verification section that verifies the validity of the document information using the partial identification information and partial correction information associated with each other by the management section.

2. The digital document management system according to claim 1, wherein

the partial identification information generation section divides the document information into a plurality of parts and generates the partial identification information based on the respective parts of the document information.

3. The digital document management system according to claim 2, wherein

the partial identification information generation section uses a hash function to generate the partial identification information.

4. The digital document management system according to claim 1, wherein

in the case where any correction has been made to the document information, the partial identification information generation section generates new partial identification information only for a part that has been corrected from the previous version.

5. The digital document management system according to claim 1, wherein

the document information, partial identification information, and partial correction information include a signature.

6. The digital document management system according to claim 1, comprising a registration policy verification section that verifies whether the document has been corrected properly according to the policy information in the case where any correction has been made to the document information.

7. The digital document management system according to claim 1, wherein

the information managed by the management section is constituted by XML data having a hierarchical document structure.

8. The digital document management system according to claim 7, wherein

the partial identification information generation section corrects XML data having a hierarchical document structure according to a correction instruction for correcting respective parts of the document information to generate partial identification information with respect to all parent elements and child elements for both the part that has been corrected from the previous version and the part that has not been corrected therefrom.

9. The digital document management system according to claim 8, wherein

the partial identification information generation section generates partial identification information with respect to child elements and their belonging parent element only for the part that has been corrected from the previous version, and

the management section manages only difference partial identification information from the previous version.

10. The digital document management system according to claim 1, wherein

the management section handles all digital information as original document information corresponding to version numbers, and

an access to the content of the original document information managed based on its version numbers can be controlled depending on the content thereof in the respective versions in an identifiable manner.

11. A digital document management method that manages document information created in a digital form by a computer, comprising:

a registration request reception step in which the computer receives a registration request of the created document information;

a registration policy verification step that verifies whether the document information received in the registration request reception step complies with predetermined policy information by referring to information in a policy storage section previously storing the policy information;

a partial identification information generation step that generates partial identification information that represents, in an identifiable manner, respective parts of the document information in the case where it is determined by the registration policy verification step that the document information complies with the predetermined policy information; and

a registration step that registers the document information, partial identification information, and policy information in an associated manner.

12. A digital document management method that manages document information created in a digital form by a computer, comprising:

a correction request reception step in which the computer receives a correction request concerning document information that has been corrected from document information to be managed;

a correction policy verification step that verifies whether the document information received in the correction request reception step complies with predetermined policy information stored in a policy information storage section;

a partial identification information generation step that generates partial identification information that represents, in an identifiable manner, respective parts of the corrected document information in the case where it is determined by the correction policy verification step that the document information complies with the predetermined policy information;

a partial correction information generation step that generates partial correction information which is information related to a correction history of the corrected part in the case where it is determined by the correction policy verification step that the document information complies with the predetermined policy information;

a management step that manages the corrected document information, partial identification information, partial correction information, and policy information in an associated manner; and

a registration document verification step that verifies the validity of the document information using the partial identification information and partial correction information associated with each other by the management step.

13. A digital document management program allowing a computer to execute management of document information created in a digital form, the program allowing the computer to execute:

a registration request reception step that receives a registration request of the created document information;

a registration policy verification step that verifies whether the document information received in the registration request reception step complies with predetermined policy information by referring to information in a policy storage section previously storing the policy information;

a partial identification information generation step that generates partial identification information that represents, in an identifiable manner, respective parts of the document information in the case where it is determined by the registration policy verification step that the document information complies with the predetermined policy information; and

a registration step that registers the document information, partial identification information, and policy information in an associated manner.

15. The digital document management program according to claim 13, wherein

the partial identification information generation step allows the computer to divide the document information into a plurality of parts and generate the partial identification information based on the respective parts of the document information.

16. The digital document management program according to claim 13, wherein

the information managed by the management step is constituted by XML data having a hierarchical document structure.

17. The digital document management program according to claim 13, wherein

the partial identification information generation step corrects XML data having a hierarchical document structure according to a correction instruction for correcting respective parts of the document information to generate partial identification information with respect to all parent elements and child elements for both the part that has been corrected from the previous version and the part that has not been corrected therefrom.

18. The digital document management program according to claim 13, wherein

the partial identification information generation step generates partial identification information with respect to child elements and their belonging parent element for the part that has been corrected from the previous version while generates partial identification information with respect only to a parent element for the part where all the child elements belonging to the parent element have not been corrected.

14. A digital document management program allowing a computer to execute management of document information created in a digital form, the program allowing the computer to execute:

a correction request reception step that receives a correction request concerning document information that has been corrected from document information to be managed;

a correction policy verification step that verifies whether the document information received in the correction request reception step complies with predetermined policy information stored in a policy information storage section;

a partial identification information generation step that generates partial identification information that represents, in an identifiable manner, respective parts of the corrected document information in the case where it is determined by the correction policy verification step that the document information complies with the predetermined policy information;

a partial correction information generation step that generates partial correction information which is information related to a correction history of the corrected part in the case where it is determined by the correction policy verification step that the document information complies with the predetermined policy information;

a management step that manages the corrected document information, partial identification information, partial correction information, and policy information in an associated manner; and

a registration document verification step that verifies the validity of the document information using the partial identification information and partial correction information associated with each other by the management step.