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+Different parts of libretools are either the GNU General Public
+License version 2 or 3; sometimes with, sometimes without the option
+to use a later version of the license.  Which one is specified on a
+per-file basis; look at the source.  In addition to a full copyright
+and license statement, each file contains a "License:" line to make
+searching easy.
+
+Full copies of the GNU General Public License versions 2 and 3 are
+included as `COPYING-GPLv2` and `COPYING-GPLv3`, respectively.
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