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This paper presents a relay recording model for supporting user's recording at random from DTV live broadcast channels for IPTV nPVR services. Based on the recorded files, SMIL annotation is used to playback a recording in a segmentation fashion for users' viewing their recordings. A relay recording algorithm is proposed and its implementation issues are addressed. Some analyses and evaluations show that as compared with the traditional recording model that records channels all the time, the proposed relay recording model is beneficial on the storage usage of nPVR server for most live broadcast channelS.