I always viewed my lectures as my (or the university's by contract) intellectual property. If a student wanted to record them they should ask first, so I knew who would be using it and why. The student paid to see those lectures, but like paying to see a play or movie, that doesn't give the right to record it.
Are you checking at the door for computers, cell phones, and other recording devices? There are a slew of good reasons for wanting recordings kept out of the classroom, but when every student is carrying a cell phone and a laptop (even if they're not allowed to use them in a particular class), I fail to see how any instructor could stop someone with even minimal determination from doing it over any objections.
Most of that is for personal use, and should be discouraged without permission. When it goes beyond that, I recognize piracy happens in all areas of intellectual property. Just because it happens doesn't mean it should be condoned.
Poll
