On Linux, I'd just copy the dvd iso image to hard disk. Players like VLC player can open and play and iso image plus the image is on hard disk ready to burn to another dvd if needed:

dd if=/dev/dvd of=mydvd.iso bs=1024

Take care with dd though. It can (and is also used to) wipe entire drives and does not give any warnings about where you've told it to write.