students have been taping professors for decades in order take better notes for study.
The comments of professors are not "private" they are PAID for.
The students pay for the class, but not the right to tape the professor's comments. As I mentioned before, I have not problem with students taping my lectures as it is done for note service. I also have nothing to 'hide'...
Nevertheless from a University perspective I think that they would side with the professor should he/she not want students to tape their lectures.