He has some instructional DVDs that he would like to host online. Obviously they would need to be converted in format. The two main requirements are not allowing the videos to be downloaded and be able to give password access per video to individuals. For example, he wants to let Joe watch video A and Jane watch video B online.
I keep reading you don't want to host video content on your own site. Also, YouTube is out because I don't think there is a way to prevent downloading. I have done a little research on Vimeo, which I think may work, but other options would be good.