An image forming apparatus is connected to an information processing apparatus via a network. The information processing apparatus may be configured to accumulate files. The information processing apparatus may include a communicating part configured to communicate with the information processing apparatus; a data obtaining part configured to obtain data to be accumulated; an encrypting part configured to encrypt the data to be accumulated; a metadata generating part configured to transmit the encrypted data to be accumulated to the information processing apparatus, and set metadata, which is received or generated by an operation receiving part, in a property of the data to be accumulated according to a WebDAV protocol; and an access control information setting part configured to set access control information which defines whether to permit an edit, an addition or a deletion of the metadata as well as an access entity according to the WebDAV protocol.