Known entropy bounds, and the Generalized Second Law, were recently shown to
imply bounds on the information arriving at future null infinity. We complete
this derivation by including the contribution from gravitons...We test the
bounds in classical settings with gravity and no matter. In Minkowski space,
the bounds vanish on any subregion of the future boundary, independently of
coordinate choices. More generally, the bounds vanish in regions where no
gravitational radiation arrives. In regions that do contain Bondi news, the
bounds are compatible with the presence of information, including the
information stored in gravitational memory. All of our results are consistent
with the equivalence principle, which states that empty Riemann-flat spacetime
regions contain no classical information. We also discuss the possibility that
Minkowski space has an infinite vacuum degeneracy labeled by a choice of Bondi
coordinates (a classical parameter, if physical). We argue that this degeneracy
cannot have any observational consequences if the equivalence principle holds. Our bounds are consistent with this conclusion.(read more)