BBC Horizon - lnside The Dark Web (en subs)

With many concerned about internet surveillance, Horizon meets the hackers and scientists whose technology is fighting back. See also https://prism-break.org/

Update 25 september 2015
Top-secret program records website browsing habits of “every visible user on the Internet.” https://theintercept.com/2015/09/25/gchq-radio-porn-spies-track-web-users-online-identities/