Abstract: A disclosed document management system reduces the risk of information leakage and prevents an operation error by simplifying operations. The document management system includes an image forming apparatus with a scan unit for scanning a paper document into digitized document data; a user authentication server for user authentication; and an encrypted document server having encrypted folders for storing encrypted document data based on the access right of a user. The image forming apparatus includes an encryption unit configured to encrypt document data and a delivery unit configured to deliver encrypted document data to one of the folders in the encrypted document server to which access is allowed based on the access right of a user authenticated by the authentication server.