The best way to obscure the face of a person being interviewed?

Question

What is the correct way in using Mac OSX, 10.4.10, and iLife 06, to obscure the face of a person being interviewed in order not to be identified in editing movies?

Answer 1

Back light the subject with a low positioned flood light.
No frontal light.
You will get a silhouette.

Answer 2

Halloween masks are cheap and plentiful this time of year.

Don't forget the voice!

Don't forget any non-hidden vidoe/audio will remain on your hard drive waiting to be stolen or subpoenad.

Maybe indymedia.org would be a good place to look for the ful set of advice on this.