unable to mount read-only DVD with photos

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http://askubuntu.com – I have a working Samsung CD/DVD player (SATA connection) and am running latest updated version of 12.04. Audio CDs and video DVDs appear in the devices sidebar, but I have a DVD from a professional photographer with pictures of my daughter and friends which will just not open. When I try to mount in terminal I get the following message: mount: block device /dev/sr0 is write-protected, mounting read-only mount: you must specify the filesystem type I am assuming it's JPEG. What should I do next? I have looked through previous questions in this area but none seems to address this particular (HowTos)