Open Source Licenses

A short and simple permissive license with conditions only requiring preservation of copyright and license notices. Licensed works, modifications, and larger works may be distributed under different terms and without source code.

A permissive license whose main conditions require preservation of copyright and license notices. Contributors provide an express grant of patent rights. Licensed works, modifications, and larger works may be distributed under different terms and without source code.

A permissive license similar to the BSD 2-Clause License, but with a 3rd clause that prohibits others from using the name of the copyright holder or its contributors to promote derived products without written consent.

A permissive license that comes in two variants, the BSD 2-Clause and BSD 3-Clause. Both have very minimal requirements about how the software can be redistributed.

A permissive license lets people do anything with your code with proper attribution and without warranty. The ISC license is functionally equivalent to the BSD 2-Clause and MIT licenses.

A permissive free software license compatible with the GNU General Public License. It is the license under which Python itself is released.

A permissive free software license which defines the terms under which the zlib software library can be distributed.

Permissions of this weak copyleft license are conditioned on making available source code of licensed files and modifications under the same license. A larger work may be distributed under different terms.

Permissions of this copyleft license are conditioned on making available complete source code of licensed works and modifications under the same license. A larger work using the licensed work through interfaces can be distributed under different terms.

Primarily used for software libraries, the GNU LGPL requires that derived works be licensed under the same license, but works that only link to it do not fall under this restriction.

Permissions of this strong copyleft license are conditioned on making available complete source code of licensed works and modifications under the same license. Copyright and license notices must be preserved.

Permissions of this strongest copyleft license are conditioned on making available complete source code of licensed works and modifications, including larger works using a licensed work, under the same license.

The GNU GPL is the most widely used free software license and has a strong copyleft requirement. When distributing derived works, the source code of the work must be made available under the same license.

A license with no conditions whatsoever which dedicates works to the public domain. Unlicensed works, modifications, and larger works may be distributed under different terms and without source code.

The Creative Commons CC0 Public Domain Dedication waives copyright interest in a work you have created and dedicates it to the world-wide public domain.

Works in the public domain are those whose intellectual property rights have expired, been forfeited, or are inapplicable. No permission is needed to copy, modify, or distribute public domain works.