in regards to totem being able to play the DVD, it could possibly be 
that totem has a UDF parser within it, and is reading the raw device and 
hence ignores the permissions.

In regards to UDF permissions, a possible solution (possibly hack) to 
the issue instead of getting rid of permission entirely

1) mount disk on insertion
2) check if it's video DVD (AUDIO_TS/VIDEO_TS folder)
3) check perms
3a) if invalid, remount with option to sanitize perms

-- 
DVDs with restrictive permissions are unreadable for normal user
https://bugs.launchpad.net/bugs/10550
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