A method for moving a rights object (RO) between devices, a method of using a content object based on the moving method, and devices using the methods are provided. The moving method includes performing authentication between two devices; securing a connection between the devices; and communicating the rights object between the two devices. The using method includes two devices communicating with each other, the first device having use permission of content objects and the second device including the content objects and corresponding rights objects; the first device searching for the content objects; and the first device using the content object that was found. The device includes an authentication module to authenticate another device; a security formation module to secure a connection for the other device; and a transceiving module which communicates a rights object for which the connection has been secured.