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We have developed an audiovisual content recorder using a removable hard disk drive. Protection of digital content recorded on the removable medium is important. Besides a large capacity and a high speed, the hard disk drive has much better features than optical discs, one of which is intelligent enough to make bi-directional authentication in the system. This benefit realizes more flexible and reliable protection of digital content. This paper describes the architecture of the developed audiovisual content recorder, focusing on its content protection technology.

We have developed a 3D player using a high density optical disc (CD-ROM) as the storage medium. Two video channels are compressed by MPEG2 technology while the audio signal is compressed by MPEG1 technology. The player is controlled by our newly developed real time OS. This OS allows the video and audio MPEG streams to be synchronized during playback. The 2 channels video data and audio data are interleaved during recording on the disc. We also have developed a unique disc recording format. The 3D data recorded with this format are exactly synchronized during playback. >