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
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