HDCP (High-bandwidth Digital Content Protection): high-bandwidth digital content protection technology. The HDTV (high-definition television) era is coming. In order to adapt to the high bandwidth of high-definition television, HDMI appeared. HDMI is a high-definition digital interface standard that can provide high bandwidth and lossless transmission of digital video and audio signals. In order to ensure that high-definition signals transmitted by HDMI or DVI will not be illegally recorded, HDCP technology emerged. The HDCP technical specification is led by Intel. When users make illegal copies, this technology will interfere and reduce the quality of the copied images, thereby protecting the content.