Lawrance Lessig is a professor at Stanford Law School and author of various books on IP and (c) technology issues. In this unique 40min presentation he gave in 2002 at the Open Source conference OSCON he convincingly argues that society is less free to “create” today than it has ever been in history. He presents proof that fair-use and unregulated use are increasingly falling off the map due to technological advancements and laws such as the DCMA, leaving a society dominated by regulated use.

Also, regardless of your opinion on the topic he has a unique presentation style to make note of. It forces the audience to pay attention to the speaker by using the slide to emphasize verbal points instead of showing bullet lists.