Citizenfour is an Academy Award winning documentary on the story of Edward Snowden. He was a contractor for the NSA as a systems administrator working out of Hawaii, and that's how he was able to obtain information. What he did with that information is what became so controversial. He went to Hong Kong, and contacted journalists to give them this information he had collected, but didn't want anything released that would risk the lives of government operatives. Instead, he wanted journalists to tell the world, Americans in particular, what the NSA had been up to.
The most recent leak from Edward Snowden is about an NSA program called "Quantum." The Intercept, a publication created to release this information, claims that this quantum tool weaponizes the internet. It is a malware tool that can infect machines at an industrial scale exploitation. The agency has malware tools that could infect millions of computers worldwide that allows them to eavesdrop on the computer's owner. It can covertly record audio from the computer microphone and take pictures from the computer webcam.
The NSA has said that Edward Snowden used a cheap, common webpage downloader to grab data.
Snowden Used Low-Cost Tool to Best N.S.A. (NY Times)…