high-bandwidth digital content protection (copy protection) (HDCP)
High-Bandwidth Digital Content Protection (HDCP) is a copy protection developed by Intel that prevents you from copying multimedia content, especially video and audio, from the output of various digital interfaces such as the DVI interface and the HDMI interface.
To ensure secure system protection, an encrypted connection is established between the computer's graphics system or high-definition television( HDTV) receiver and the display. For this purpose, the decoders of the devices have a certified 56-bitkey. Before transmission, the two devices exchange the key information protecting the signal in handshake mode.
HDCP is a robust encryption method for transmitting digital content to connected displays. It is an authentication protocol in which the graphics system is called the video transmitter and the display is called the video receiver. After authentication, the data is transmitted and the copy protection is removed when the DVD player or the receiver of HDTV and the display or the projector have identified themselves via the Digital Visual Interface (DVI).
The HDCP process is a private key process with linear key exchange. It is mandatory for Blu-Ray discs.