Now available on video, two lectures by professor Frank Michelman, held at Frankfurt University on May 17 and 18, 2010, on "The Case of Liberty"
Lecture I: Liberty, Liberties, and "Total Freedom" (video, approx 1 hour)
Lecture II: Contract versus Common Ground? (video, approx 1 hour)
See the programme for the lectures here.
Also see Michelman's critical paper on Ronald Dworkin: "Foxy Freedom" (pdf) in "Boston University Law Review" vol. 90 no. 2 (April 2010).
Frank Michelman is Robert Walmsley University Professor at Harvard Law School.