Hello, I've been contemplating purchasing AnyDVD for several months now, and I think I'm ready to do so. However, I'm confused by the descriptions I see. AnyDVD HD says it has all the functionality of AnyDVD, plus various other features. Yet it costs less. How can this be? Is it or is it not an add-on to AnyDVD? Can I use AnyDVD HD as a standalone with regular DVDs? Thanks!