  To apply the laws of General Relativity to quantum black holes, one first
needs to remove the horizon singularity by means of Kruskal-Szekeres
coordinates. This however doubles spacetime, which thereby is equipped with an
exact binary symmetry. All particles near a black hole share the same symmetry,
and conservation of this symmetry may completely remove the information
paradox: the quantum black hole has no interior, or equivalently, the black
hole interior is a quantum clone of the exterior region. These observations,
totally overlooked in most of the literature on quantum black holes, resolve
some issues concerning conservation of information. Some other problems do
remain.
