  We present a calculation of the rate of information release from a
Schwarzschild BH. We have recently extended Hawking's theory of black hole (BH)
evaporation to account for quantum fluctuations of the background geometry, as
well as for back-reaction and time-dependence effects. Our main result has been
a two-point function matrix for the radiation that consists of Hawking's
thermal matrix plus off-diagonal corrections that are initially small and
become more important as the evaporation proceeds. Here, we show that, if the
phases and amplitudes of the radiation matrix are recorded over the lifetime of
the BH, then the radiation purifies in a continuous way. We conjecture that our
results establish the maximal rate at which information can be released from a
semiclassical BH, to be contrasted with the minimal rate that was predicted by
Page on the basis of generic unitarity arguments. When the phases of the
radiation matrix are not tracked, we show that it purifies only parametrically
close to the end of the BH evaporation and does so extremely fast. Our main
technical tool in the quantitative treatment of this purification is the purity
of the radiation matrix and, its inverse, the participation ratio. These can be
related to the Renyi entropy of the density matrix of the emitted radiation.
