Patent ID: 7890470

Claim:
A synchronization method for synchronizing a first Universal Plug and Play (UPnP) device with a second UPnP device in a UPnP network, the method comprising: generating, by the UPnP first device, a synchronization document comprising an identifier that specifies an object to be synchronized from among the content objects of the first UPnP device and the second UPnP device and information regarding a synchronization policy for synchronizing content directory services that provides metadata of contents; providing the synchronization document to the second UPnP device; and synchronizing the first UPnP device and the second UPnP device based on the synchronization document, update information of the first UPnP device regarding the content objects of the first UPnP device to be synchronized, and information indicating a location from which the update information of the first UPnP device may be obtained by the second UPnP device, wherein the first UPnP device provides no content directory service and the second UPnP device provides a content directory service, wherein a format of the synchronization document is Digital Item Description Language Lite (DIDL-Lite), and wherein the information indicating the location comprises a Uniform Resource Identifier (URI).