Patent ID: 7979392

Claim:
A method of preventing duplicate saving of a resource in a universal plug and play (UPnP) device of a receiver during content synchronization between a UPnP device of a transmitter and the UPnP device of the receiver, which provide content directory service, the method comprising: using a processor to perform: (a) receiving a change log including metadata about a changed resource from the UPnP device of the transmitter; (b) determining whether the changed resource is a duplicate of a resource saved in the UPnP device of the receiver based on the received change log and designating a saving path according to a result of the determination; and (c) receiving the changed resource in the UPnP device of the receiver and saving the changed resource according to the designated saving path; wherein the receiving the change log, the determining, and the receiving the changed resource prevents duplicate saving of the resource.