Comment 15 for bug 72872

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.