My question is about so-called "Quantum Determinism". Consider two quotes from the Wikipedia article on "Black Hole Information Paradox": "A fundamental postulate of quantum mechanics is that complete information about a system is encoded in its wave function up to when the wave function collapses." (my italics) "Quantum determinism means that given a present wave function, its future changes are uniquely determined by the evolution operator." Obviously the second quote should finish with "... until the wave function collapses due to measurement or some other process." It almost appears that Stephen Hawking - and others who work on this "paradox" - is assuming something like MWI, where the "collapse doesn't happen"; simply forgetting that of course it does happen in the real world. And when it does, information (about the eigenstates not instantiated) is lost forever. Please clear up my apparent misunderstanding.