OK... I'm a little surprised at all this feedback and no good answers.
If you have read access to everything, this isn't a hard problem to fix.
First, make sure the disc is mounted.
Next, make a "Junk" folder on your desktop.
now open a terminal. type these commands:
sudo bash (will log you in as root)
cp -R /Volumes/DVDName/* ~/Desktop/Junk
now it's time to fix the permissions. type these:
chown -R [yourusername] ~/Desktop/Junk/* (makes you the owner)
chmod -R +rw ~/Desktop/Junk/* (gives you read and write permission).
There you go.