Patent ID: 8413257
Filing Date: 2013-04-02
Classification: G06F

Abstract:
1. A document management system comprising: a protection policy storage unit that stores at least one piece of a plurality of pieces of document protection policy information, each of the pieces containing a document manipulation condition representing manipulation permitted for a certain user or a group, each of the pieces being stored in association with a secret key and a public key; a correspondence storage unit that stores a correspondence between electronic documents and the pieces of the document protection policy information; an embedding unit that embeds, in a sheet, public key information indicating the public keys corresponding to a given piece of the document protection policy information assigned to a given electronic document of the electronic documents when the given electronic document is printed on the sheet to produce a paper document, the piece of the document protection policy information corresponding to user manipulation which is allowed to be performed for the paper document; a portable identification unit that includes unique information and that is assigned to the certain user; a storage control unit that controls the portable identification unit so that authentication support information obtained based on the unique information and the secret key corresponding to a certain piece of the document protection policy information containing the document manipulation condition of manipulation permitted for the certain user or the group to which the certain user belongs and the document manipulation condition of manipulation permitted for the certain user in the certain piece of the document protection policy information are stored in the portable identification unit in association with the public key information corresponding to the certain piece of the document protection policy information; and a document manipulation unit that executes a user manipulation specified by the certain user to the paper document and that includes: wherein the portable identification unit includes: