Can someone tell me what protocol the Downloader uses and what Galaxy will be using.
I'm asking because some ISPs in South Africa are talking about restricting access to some protocols, specifically Bittorrent.

I've heard a number of ISP's don't like bittorrents for stupid reasons. quite often they block specific sets of numbers used for the protocol rather than anything else. If the data's encrypted they can't know what type of protocol you're using. Most clients let you set what your listening/communication ports are anyways.

As for GoG/Galaxy, i couldn't tell you. I am aware some downloaders like some Free-To-Play games use torrents to distribute their larger downloads, although the downloader disguises it and locks the client to a particular torrent set rather than just telling you. So...

Thanks for the information.
This isn't really about piracy, the ISPs are more worried about excessive traffic, like people downloading an entire TV series overnight, everynight.