Recently, one of the main objectives of DRM system is to develop a user-friendly DRM system. In this paper, we propose a new DRM system based on graded contents sharing and time-block distribution for home networks. In particular, we focus on supporting partial use of the contents and enabling a user to use his multiple devices freely in the home network. Moreover, our system enables a device to use contents in both on-line and off-line situation since contents or time-blocks can be exchanged among user?s multiple devices in home network without collaboration of a DRM server.