US Patent 7599984 Method of exchanging user messages among interactive disk players

A method of exchanging user messages among interactive disk players through an external server is disclosed. The external server receives a user message from a first interactive disk player and stores the user message in an internal memory. Receiving a message request from a second interactive disk player, the external server compares playback time included in the message request and playback time included in the stored user message and sends the stored user message to the second interactive disk player if the two playback times are almost the same. The method allows users of individual interactive disk players to exchange opinions about the same DVD title irrespective of their individual playing positions.