How do I take scenes off a dvd so it is on my computer in order to add it to a video I'm making?

I want to make something like this: a href="http://www.youtube.com/watch?v=JJxwuuIOQAc&search=laguna%20beach" rel="nofollow"http://www.youtube.com/watch?v=JJxwuuIOQ…/a