COPYING

 Most files are licensed under the GNU General Public License (GPL) version 2,
 or (at your option) any later version. See "LICENSE-GPL2" in the root of this
 distribution.

 The files in the scripts/python/ directory are released under GNU General
 Public License (GPL) version 3, or (at your option) any later version. See
 "LICENSE-GPL3" in the root of this distribution.

 The Perl client module (scripts/perl/Nut.pm) is released under the same
 license as Perl itself. That is to say either GPL version 1 or (at your option)
 any later version, or the "Artistic License".

 Several fallback implementations for methods absent from standard library of
 an end-user's current build platform are derived from source code available
 under the two-clause BSD license (common/strptime.c, common/strnlen.c)

 Various methods may be adapted from code or ideas posted on Stack Exchange
 sites (comments in NUT sources refer to original posts in this case), which
 according to https://stackoverflow.com/help/licensing are made available under
 different Creative Commons Attribution-ShareAlike license (CC BY-SA) versions
 depending on contribution timestamp.

 Several autoconf methods under m4/ directory are derived from curl codebase
 and were originally available under curl license. Which is not unlike the MIT
 license, see https://daniel.haxx.se/blog/2022/06/17/curl-is-reuse-compliant/

 To the best of our knowledge, conditions of the 2/3-clause BSD, MIT, curl and
 CC BY-SA licenses allow redistribution and reuse of the codebase in projects
 made available under GPL license terms, as long as attribution is provided.