License

Flask is licensed under a three clause BSD License. It basically means: do whatever you want with it as long as the copyright in Flask sticks around, the conditions are not modified and the disclaimer is present. Furthermore you must not use the names of the authors to promote derivatives of the software without written consent.

The full license text can be found below (Flask License). For the documentation and artwork different licenses apply.

Authors

Flask is written and maintained by Armin Ronacher and various contributors:

Development Lead

• Armin Ronacher <armin.ronacher@active-4.com>

Patches and Suggestions

• Adam Zapletal
• Ali Afshar
• Chris Edgemon
• Chris Grindstaff
• Christopher Grebs
• Daniel Neuhäuser
• Florent Xicluna
• Georg Brandl
• Justin Quick
• Kenneth Reitz
• Marian Sigler
• Matt Campell
• Matthew Frazier
• Michael van Tellingen
• Ron DuPlain
• Sebastien Estienne
• Simon Sapin
• Stephane Wirtel
• Thomas Schranz
• Zhao Xiaohong
• Edmond Burnett

General License Definitions

The following section contains the full license texts for Flask and the documentation.

• “AUTHORS” hereby refers to all the authors listed in the Authors section.
• The “Flask License” applies to all the sourcecode shipped as part of Flask (Flask itself as well as the examples and the unittests) as well as documentation.
• The “Flask Artwork License” applies to the project’s Horn-Logo.

Flask License

Copyright (c) 2014 by Armin Ronacher and contributors. See AUTHORS for more details.

Some rights reserved.

Redistribution and use in source and binary forms of the software as well as documentation, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• The names of the contributors may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Flask Artwork License

Copyright (c) 2010 by Armin Ronacher.

Some rights reserved.

This logo or a modified version may be used by anyone to refer to the Flask project, but does not indicate endorsement by the project.

Redistribution and use in source (the SVG file) and binary forms (rendered PNG files etc.) of the image, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice and this list of conditions.
• The names of the contributors to the Flask software (see AUTHORS) may not be used to endorse or promote products derived from this software without specific prior written permission.

Note: we would appreciate that you make the image a link to http://flask.pocoo.org/ if you use it on a web page.