This article doesn't answer that question, but it raises it and a few others. It was linked to by Greg Mankiw who was big enough to say that he is "not at all confident that I am right about this one."
The founder of the company that is profiled is Andrew Magliozzi, son of one of the CarTalk guys. CarTalk, if you don't know, is the greatest radio show in the history of the medium.
I think a professor or university may have a claim if a student posted video of an entire semester of lectures without the professor's consent. Class notes and recalled information from tests, however, seem to be fair game. Especially if the online service is free. Scanned images or digital pictures of tests would also seem, to me, a bridge too far, but the website doesn't seem to do that.