Thank you, @jamerussell! I've heard of "Citizenfour" and have wanted to watch it for a while.
I remember closely following the Snowden story. I have also read Glenn Greenwald's book "No Place to Hide" and watched a few interviews featuring him, which is where some ideas I have planned to write have come from.
Unfortunately, neither of the links you shared seems to work from Australia. However, I can most likely access "Citizenfour" elsewhere, so I will try to watch it before I continue.
RE: Metadata and government surveillance practices - Part 1