Just to add that common sense would suggest that any permissions are
purely to enable them to be reconstructed when copying/restoring from
the media (and not to actually affect access on the disc, since this
becomes meaningless on other physical machines and can easily be
bypassed).

But, as I said, I'm no expert on the original intentions of these
various standards and their implementations. It's not so clear cut when
you think about the grey area of removable HDDs (one could argue that
CD/DVD enforced permissions make sense in scenarios where this is
control over physical access to the media e.g. disc can't leave a
certain room with one PC, where you may *want* to enforce permissions).

Sorry, perhaps a little philosophical, but just stressing the point that
a clear understanding/statement of the technical requirements (and their
interpretation by Linux/Ubuntu) is needed.

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