Digital rights management with right delegation for home networks

The purpose of digital rights management (DRM) is to protect the copyrights of content providers and to enable only designated user to access digital contents. For a user to share the contents among all his devices in the home network, several domain-based approaches that group multiple devices into a domain have been proposed. In these approaches, however, each device in a domain has equivalent rights on all contents although certain contents require an access control between the devices. In this paper, a new DRM system for home networks is presented. This system enables access control on the contents by a right delegation strategy with proxy certificates. Moreover, it also provides additional functionalities, including restricted sharing and temporal sharing of contents, which are necessary for ordinary scenarios in home networks.