Questions about BBC plugin

The BBC plugin (bbc.co.uk) has an option called "Enable Tor" which doesn't affect UK or proxy users.



Can someone please explain what this means, is or does?

Does it use Tor to download if outside the bbc iplayer geolocation? Do I need Tor installed or am I required to do anything else?


Also, what is the "Preferred CDN" and what should I choose?


Thanks,
MrBear