The event will focus on how news organizations and reporters can use technology and encryption to better protect their sources in the post-Snowden age.

Bill Moyers spoke with investigative reporter Julia Angwin, author of the new book Dragnet Nation: A Quest for Privacy, Security and Freedom in a World of Relentless Surveillance. The full episode is above.

BILL MOYERS: What has happened to the Fourth Amendment?

NSA whistleblower William Binney warns that the agency collects so much useless information that it can't process it effectively. The Snowden leaks about the MUSCULAR surveillance program (tapping the fiber links connecting up the data-centers used by Internet giants like Google and Yahoo) corroborate Binney's view: in 2013, NSA analysts asked to be allowed to collect less data through MUSCULAR, because the "relatively small intelligence value it contains does not justify the sheer volume of collection."