I know this is a touchy subject these days.. but: What are the specific rules for the distribution of the audio files and pdf encoded notes from the lectures of Feyman, Segal, Hawkings...etc. I came across a huge collection of these on the net (in the thousands) and was just wondering if I will get the electric chair for having anything to do with them. They all seem to be taped course lectures rather than production quality releases. I'm almost certain that many of the professors on the list never sold commercial versions of these lectures. btw. I googled with no success.