HDCP. An encrypted stream with a pre-shared key, designed to prevent the interception of video and audio streams over HDMI cables. Even DVDs data streams are e

HDCP. An encrypted stream with a pre-shared key, designed to prevent the interception of video and audio streams over HDMI cables. Even DVDs data streams are encrypted, which is why the release of that magic number (AKA a pre-shared key) is such a big thing.