A document managing system includes: a document use controller; and a document storage device, the document use controller including: a managing unit; and an instructing information transmitting unit, and the document storage device including: an index information holding unit; an instructing information...http://www.google.de/patents/US8001149?utm_source=gb-gplus-sharePatent US8001149 - Document managing system, document use controller, document storage device, document managing method, and computer readable medium for updating index information at a storage device in response to change of index use permit/inhibit information at a document use controller
