The logical way to (try) and capture output from this Humax box would entail taking the HDMI output from the Humax box and capturing it on the Mac. As standard no Mac has a HDMI input however a variety of HDMI capture interfaces are available for Macs using either USB or Thunderbolt typically.
The Humax 1100S has three main output connectors, a SCART analogue connection, a set of RCA plugs - also analogue and a HDMI 1.4 port. The HDMI signal might be protected by HDCP. Since FreeView and FreeSAT are 'free' services they might not activate HDCP, as a comparison Sky a paid for satellite service definitely does use HDCP.
