The Twine application program is copyright Chris Klimas and other contributors, and is licensed under the GPL, version 3. It is written in Python using wxPython, which is licensed under the wxWindows Library License.
The application program, and generated Twine stories that use the jQuery StorySetting, contains a copy of jQuery 1.11, copyright jQuery Foundation and other contributors, and is licensed under the MIT license.
The runtime engine also contains the following code:
|CssLexer.js||https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/plugin/csslexer.js||Apache License v2.0|
|CssParser.js||https://code.google.com/p/google-caja/source/browse/trunk/src/com/google/caja/plugin/cssparser.js||Apache License v2.0|