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### License
-Ripser is licensed under the [MIT] license. Please contact the author if you want to use Ripser in your software under a different license.
+Ripser is licensed under the [MIT] license (`COPYING.txt`), with an extra clause (`CONTRIBUTING.txt`) clarifying the license for modifications released without an explicit written license agreement. Please contact the author if you want to use Ripser in your software under a different license.
[Ulrich Bauer]: <http://ulrich-bauer.org>
[live.ripser.org]: <http://live.ripser.org>