I wanted to chime in regarding a similar issue on the 54250wyk NUC. I am trying to use windows media center to watch hdhomerun prime. When I'm using the HDMI out port (through my Denon amp) everything works fine. But when I attempt to use the Displayport (via a hdmi adapter) I get an error about HDCP not supported. I have to use adapters for both the HDMI and Displayport but wanted to get some thoughts on if this is a known issue - HDMI graphics gets HDCP but Displayport doesnt.
THanks