Sure enough, they did. Warner demanded YouTube take down one of Lessig's presentations.
As Mike Masnick of Techdirt put it, "If there were anyone out there to whom you would not want to send a random takedown notice for an online video, it would probably be Larry Lessig."
The mood on the net seems to be various flavors of gleeful, especially after Lessig said--not surprisingly--that this takedown order is most definitely going to get a fight.
Everyone's hoping for fireworks. Let's hope we all get some.