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actually it does mean that adobe can't come in and radically change the language, invalidating every other PDF interpreter out there, and still call it PDF. apple, microsoft, you, and me are able to write our own pdf interpreter and expect it to work with standard pdf documents out there. if adobe wanted to introduce some new features that would break compatibility it would have to be with the approval of the ISO standards body and whatever organizations were on the team that approve the PDF standard. they can easily object and veto Adobe's proposal. PDF is out of Abobe's control for all intents and purposes.
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