Russell Simmons sues HBO and 'On the Record' assault documentary directors alleging defamation and dismissed evidence.

But HBO Documentary Films, which started in a nascent form in the late 1970s, remains a distinguished player, regarded as an especially prestigious and director-driven home for nonfiction fare.

NPR's Scott Simon asks Ronan Farrow about his new HBO documentary, "Surveilled," which looks at the increasing use of spyware.