Remember that we have to admit this is blocked by not only user agreements but by HDMI's HDCP as well. HDMI, HDCP descriptions are on the web.

On top of that, in the USA it's currently illegal to record HDCP content.

So you would need a HDMI splitter so you can see what's on then the second feed goes to a box which in the USA doesn't exist that strips HDCP then converts the HD signal to what the recorder uses.

I think it would be far easier to just Telecine this one. That is, setup a phone or camcorder, point it at the screen, record. Done.