Selling class notes illegal?

http://blog.wired.com/27bstroke6/2008/04/prof-sues-note.html

Apparently from the above article, a professor in University of Florida is suing the company Einstein Notes for "repackaging notes as 'studykits' and then profiting from the other lazy students that don't go to classes" without permission. Some students in the class are "payed" for taking notes and thus the professor states it's a "illegal distribution of copyrighted material" and thus is "infringement of copyright laws"

Unlike previous cases, this professor actually copyrighted his lectures, and he recorded every one of them. So, it's much more viable for a law suit. BUT, lots of possibilities could open up if this law suit against Einstein Notes is successful. Companies like Cliff Notes have been in the business of providing commentaries and summaries of novels, which are supposed to be copyrighted - what if they get sued?