Patent ID: 9081984
Filing Date: 2015-07-14
Classification: G06F,H04L

Abstract:
1. A document control apparatus comprising: a document storage circuit that stores therein a plurality of documents, for each of which access authorization is performed such that an access authority to access said each document is granted to a corresponding one of users of said each document or a corresponding one of at least one group said users belong to; a duty position and organization information storage circuit that stores therein duty position levels, which represent height levels of respective official positions with respect to said users; a duty position information calculation circuit that, for each of documents acquired from said document storage circuit, calculates a duty-position level average, which is an average value of duty position levels of respective all of users who are authorized to access said each document acquired from said document storage circuit, by using duty position levels acquired from said duty position and organization information storage circuit, and further, calculates a duty-position level variation, which is a variance value of said duty position levels; a single document detection circuit that detects a document, for which said calculated duty-position level average is lower than a predetermined value and said calculated duty-position level variation is smaller than a predetermined value, as an illegitimate document for which there is a violation in said access authorization; and an organization information calculation circuit, wherein said at least one group includes a plurality of groups, and said duty position and organization information storage circuit further stores therein pieces of group hierarchy information representing dependency relations among said plurality of groups, a root group representing a group whose member number is larger than any other one of said plurality of groups each being authorized to access a corresponding one of said documents stored in said document storage circuit, and inter-organization distances representing distances between said route group and said respective plurality of groups, wherein, for each of documents acquired from said document storage circuit, said organization information calculation circuit calculates an inter-organization distance average, which is an average value of inter-organization distances of respective all of groups which are authorized to access said each document acquired from said document storage circuit, by using inter-organization distances acquired from said duty position and organization information storage circuit, and further, calculates an inter-organization distance variation, which is a variance value of said inter-organization distances, and wherein said single document detection circuit detects a document, for which said calculated inter-organization distance average is higher than a predetermined value and said calculated inter-organization distance variation is smaller than a predetermined value, as an illegitimate document for which there is a violation in said access authorization.