On the nature of information-erasing

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It is argued that ‘quantum effects’, are those that necessarily depend on hypothetical input unique to quantum mechanics. That is, they must be a consequence of the non-commutivity of the operators spanning phase space; i.e. Heisenberg uncertainty (HU). This fact implies that all effects described by the group SU(2), which is isomorphic to the group O(3), cannot be quantum effects because their non-commutivity is due to geometry, not HU. The consequences of this deduction are applied to the ‘quantum eraser’. The conclusion is that data from ‘quantum eraser’ experiments can be explained with Malus' Law, i.e. a non-quantum principle, and that information is just concealed, not erased.