"Additional permissions" are terms that supplement the terms
of this License by making exceptions from one or more of its
conditions. Additional permissions that are applicable to the
entire Program shall be treated as though they were included in
this License, to the extent that they are valid under applicable
law. If additional permissions apply only to part of the Program,
that part may be used separately under those permissions, but
the entire Program remains governed by this License without
regard to the additional permissions.
When you convey a copy of a covered work, you may at your
option remove any additional permissions from that copy, or
from any part of it. (Additional permissions may be written to
require their own removal in certain cases when you modify
the work.) You may place additional permissions on material,
added by you to a covered work, for which you have or can give
appropriate copyright permission.
Notwithstanding any other provision of this License, for
material you add to a covered work, you may (if authorized by
the copyright holders of that material) supplement the terms of
this License with terms:
a) Disclaiming warranty or limiting liability differently from
the terms of sections 15 and 16 of this License; or
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