I don't think the problem is whether the content is HDCP encrypted or not, the link is via HDMI and the link (meaning hardware) won't allow you to pass HD Digital content. This is an absolute pain as in the past you could connect a PC to a Production Switcher and output the content without a problem now with all Graphics cards being HDCP compliant you can't. The only way round this is an HDCP stripper.
Converting to component video would be another option and is much cheaper with negligible loss in quality for your needs.
HDCP HDMI to VGA + SPDIF RGB Component Ypbpr Converter v1.3b
You can get it from
Amazon for $32
You can then use the VGA or Component output
Hope this helps