welcome Don Zauli to the boards...
DVDs are in a socalled delivery format (mpeg2), which isn't meant and made for any processing as editing...
for using the iLife apps, you have to convert'em first, in recommended order, choose one of the following tools/workarounds:
*
DVDxDV (free trial, 25$, Pro: 90$)
*
Apple mpeg2 plugin (19$) +
Streamclip (free)
*
VisualHub (23.32$)
*
Cinematize >60$
*
Mpeg2Works >25$ + Apple plug-in
*
Toast 6/7/8 allows converting to dv/insert dvd, hit apple-k
* connect a miniDV Camcorder with analogue input to a DVD-player and transfer disk to tape/use as converter
none of these apps override copyprotection mechanisms as on commercial dvds...
http://danslagle.com/mac/iMovie/tips_tricks/6010.shtml
http://danslagle.com/mac/iMovie/tips_tricks/6018.shtml
be nice to copy rights