Need to take account of information
The Second Law is not violated provided account is taken of the entropy of the whole system - including the energy expended by the demon in gathering the required information.
Immediately related elementsHow this works
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The Arrow of Time  »The Arrow of Time 
The physics of time »The physics of time
The thermodynamic arrow »The thermodynamic arrow
Why do we see an entropy gradient? »Why do we see an entropy gradient?
Asymmetric boundary condition »Asymmetric boundary condition
Boltzmann's statistical imperative »Boltzmann's statistical imperative
Maxwell's demon objection »Maxwell's demon objection
Need to take account of information
Information and the Second Law »Information and the Second Law
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