GNU/Linux Desktop Survival Guide
by Graham Williams
Ambiguity and differences across jurisdictions exists with respect to the legalities around viewing purchased DVDs and movies. Copying of DVDs as a form of backup in case of loss or damage to the DVD may be appropriate.
Some packages expect the DVD device to be called /dev/dvd. If it does not exist, and your DVD device is /dev/hdc, for example, then simply:
# ln -s /dev/hdc /dev/dvd