Patent ID: 7626943
Filing Date: 2009-12-01
Classification: G06F,H04L,H04W

Abstract:
1. A data transmitting apparatus comprising: a transmitting unit connected to a first network and configured to transmit a check packet to a data receiving apparatus using a User Datagram Protocol (UDP); a control unit configured to receive a UDP acknowledgment message to the check packet from the data receiving apparatus, the acknowledgment message including acknowledgment information based on shared data shared with said data receiving apparatus; a computing unit configured to compute an expected acknowledgment information based on the shared data shared with said data receiving apparatus; a comparing unit configured to produce a comparison result for said data receiving apparatus based on the acknowledgment information and the expected acknowledgment information; a timer configured to determine whether a response time of the acknowledgment message is less than a predetermined time; and a judgment unit configured to judge whether subsequent content data transmitted to said data receiving apparatus will be limited in usage right based on the comparison result and the determination of the timer, if the UDP acknowledgement message is not received, the judgment unit determines that the data receiving apparatus is connected to the data transmitting apparatus through a second network, and the subsequent data content data transmitted is limited in usage right.