> I can verify that the DVD I burned was in fact readable on other Macs.

That is not surprising: Mac OS X ignores permissions on all external
media. It's simple as that.

I had this problem in past and not only with content from Mac OS X. E.g.
if would you make external hard drive with Ext2 file system, you will
have problems sharing files on it between Linux desktops as user/group
ids on different desktops are not guaranteed to match.

Solution - file systems need a special mount option to allow to ignore
permission for case of external storage. Then mount command needs to be
updated with the option (and obviously mount syscall with the new flag).

Only serious problem is how in Linux to differentiate between external
and internal storage. Last thing I'd want is for permissions on my local
hard drive to stop working.

-- 
Users do not have permission to open files in DVDs burnt in a Mac
https://bugs.launchpad.net/bugs/72872
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