As of CS4.2, PrPro can now Import 100% DVD-compliant VOB's. When this was first posted, PrPro did not have that capability, hence Jeff's suggestion. Now, not all DVD-Videos are 100% DVD-compliant. A good example will be DVD's produced by many DVR-DVD machines. Their implementation of Menus and navigation usually mess things up. To date, I've not seen anyone having issues with any DVD created in Encore, though with some other authoring apps, all bets are off.
With the non-compliant DVD's, then ripping is about the only choice, or capturing through a player hooked to an A-D device (maybe even your video camera if it has pass-through) to capture software.
Thanks for the reference to Handbrake. I have not used it, but hear of it often.
I looked at Handbrake and, unless I am mistaken, you must pay every 2 years or it expires... not something I would ever buy, if I had to buy it again every 2 years
Also... verify that whatever you use will work with CSS (is that the name?) protection... Digital Media Converter will NOT
All of my VOB's are not copy protected in any way - fortunately. If I have to work with them, they are provided by clients, who "lost" the original material, and DVD-Videos are all that are available. There are programs, that will help by-pass Copy Protection, but I never need them.
I've never looked at Handbrake, but I agree with you. If I buy something, I want to be able to use it, until I upgrade it. Thanks for that info.