  We deal with the black hole information loss paradox by showing that the
stimulated emission component of the black hole radiation contains information
about the initial state of the system. The nonlocal behaviour that allows the
recovery of information about the matter that falls behind the horizon appears
in a natural way. We calculate the expectation value and probability
distribution of particles at ${\cal J}^+$ for a non-vacuum initial state. The
entropy of the final state is compared to that of a thermal state with the same
energy per mode. We find that the information recovered about the initial state
increases with the number $r$ of the initially incoming particles, reaching for
example over 30\% for $r = 1000$. We point out that recovering information
about the initial state, nevertheless, does not automatically imply the purity
of the final state.
