Licence ↑

This software is available under three disjunctive licences: the GNU GPL version 2 (or at your option, a later version), the Perl Artistic license, or the MIT license. Note that my preference for licensing is the MIT license, but Algorithm::Diff was dually originally licensed with the Perl Artistic and the GNU GPL (“the same terms as Perl itself”) and given that the Ruby implementation originally hewed pretty closely to the Perl version, I must maintain the additional licensing terms.

  • Copyright 2004-2026 Austin Ziegler and contributors.

  • Adapted from Algorithm::Diff (Perl) by Ned Konz and a Smalltalk version by Mario I. Wolczko.

MIT License ↑

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Perl Artistic License ↑

See licences/artistic.txt in the main distribution.

GNU GPL version 2 ↑

See the file licences/COPYING.txt in the main distribution.

Developer Certificate of Origin ↑

All contributors must certify they are willing and able to provide their contributions under the terms of all of this project’s licences with the certification of the Developer Certificate of Origin (Version 1.1).

Such certification is provided by ensuring that a Signed-off-by commit trailer is present on every commit:

Signed-off-by: FirstName LastName <email@example.org>

The Signed-off-by trailer can be automatically added by git with the -s or --signoff option on git commit:

git commit --signoff