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SBCL is derived from CMU CL, which was released into the public
domain, subject only to the BSD-style "free, but credit must be given
and copyright notices must be retained" licenses in the LOOP macro
(from MIT and Symbolics) and in the PCL implementation of CLOS (from
After CMU CL was was released into the public domain, it was
maintained by volunteers, who continued the tradition of releasing
their work into the public domain.
All changes to SBCL since the fork from CMU CL have been released
into the public domain.
Thus, there are no known obstacles to copying, using, and modifying
SBCL freely, as long as the MIT, Symbolics, and Xerox copyright
notices are retained.
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