Here’s something you can try.
First, since you have no copyright issues, copy the VIDEO_TS
folder from the DVD to your hard drive ( it will speed up
the process ).
Go to the following site and get VirtualDub-mpg ( while you’re
there, you might also want to get the AC3-ACM codec ). BTW, they’re both free.
https://home.comcast.net/~fcchandler/stable/index.html
VirtualDub doesn’t need to be install. Just unzip the folder, I usually put it in the program files folder and create a shortcut for “virtualdub.exe” on my desktop.
In Virtualdub, go File-Open video file, navigate to the VIDEO_TS folder and and open any one of the VOB files. Once the file is loaded go Menu Video-Compression ( or Ctrl+P ), select a compressor and then go Menu File – Save as AVI. Do the same for all the VOBs.
You should be able to import the avi files into Vegas and render them in any format you want.
Hope this helps.