High Definition Multimedia Interface (HDMI) is a digital video/audio interface technology, a dedicated digital interface for video transmission, which can transmit audio and video signals simultaneously at a maximum data rate of 5Gbps. HDMI is compatible with HDCP (High-bandwidth Digital Content Protection) to prevent unauthorized copying of copyrighted audio and video content, and provides additional headroom for future upgrades of audio and video formats. And because a 1080p video and an 8-channel audio signal require less than 4 Gbps, HDMI has a lot of headroom. This allows it to connect a DVD player, receiver and PRR with a single cable respectively.