Well, for example, my Scientific Atlanta 8300HD refuses to acknowledge that my Marantz SR9600 with HDMI v1.1 switching is HDCP compliant. It'll produce output over HDMI, but it says that "my display device is not HDCP compliant, use component instead". While my Sony DHG-HDD500 sees the SR9600 specifically as an "HDCP Compliant Repeater".

So it's not that the 8300HD can't get HDCP, it's just that it doesn't like or know what to do with a "repeater". And considering that thing thing gets live firmware updates all the time, I can't believe this is still occuring. From reading reports on the net, the 8300HD is only flakey HDMI device.