a question for academics, lawyers about intellectual property

[spartanFan801]

I have a couple questions for people who work in academia.

If you are a prof at a state or private university, can you video tape your lecture or put together some type of lecture media based on what you teach and sell that?

Is there anything that a university forbids you from sharing with the outside world?

Also, along the same lines. Could a professor use exclusively material from a published text to sell on his own.

Here's the scenario. Let's say I wanted to hire a current professor to make a lecture series for me. So he video tapes his lectures. And then also we make an interactive DVD/CD to go along with the lecture series that is totally take from the text he teaches from.

When we try to sell that DVD/CD, are we infringing on either the publisher or U's rights?