Well, the original purpose of copyright was to allow creators to earn <i>enough</i> from their works that they could <i>create more</i>. (Since then I personally feel that it has turned into a form of money-grabbing.)<p>The argument can hardly be made that this applies to Feynman. And in this case -- especially with such a treasure trove of information -- I cannot really see much of a purpose in it not being free to distribute.