C4 HD is a DVB-S2 stream so you'll need to enable S2 search in TV server (and have a DVB-S2 capable card). As C4 HD is encrypted via NDS, Sky's encryption system, then you'll need a CAM with a recently updated and valid Sky 'Yellow House' card.
Correct. Eventually C4HD will become FTA like BBC-HD. 5 also have an HD channel in the pipeline.I take it there is now way to get ch4HD without having the above.
I don't use or subscribe to sky. so what is a yellow house card??