The Constitution and National Security: The First Amendment Under Attack, is a conference that was held on November 5th, 2010, at the Center on Law and Security, New York University School of Law.
The panel in the video below is entitled "On the Matter of Free Speech and Incitement," featuring Niall Brennan, Glenn Greenwald, Burt Neuborne, and Geoff Stone, and moderated by Barton Gellman.
Skip to the 30 minute part. That's when Glenn Greenwald begins to speak.