Adobe premiere must likely fails because the liteons record in VR mode, if so they might do a plug-in.
As thrunner states use DVDdecrypter to extract - use IFO mode as its much quicker and neater.
Womble MPEG VideoWizard is absolutely superb for fast editing and recoding if required.
Nero can edit but is a pain but I do use Nero recode to shrink and burn - real fast.
I've also used UleadDVDMovie Factory, it is surprising good for editing and will allow you to create title and chapter menus, in motion if required, but the templates are quite basic. The other thing with this is that it is much cheaper than Womble.