Most of the time, the Roku HDCP error occurs on a single channel. Protects digital content with HDCP, a protocol that prevents illegal copying and distribution of digital content. Most digital equipment is HDCP supported. A Roku is an HDCP-protected device, which means the equipment used alongside it must also be HDCP-compliant. Errors occur when non-HDCP-compliant devices try to connect to HDCP-protected systems. There is an HDCP error Roku.