MIT License
MIT License
The MIT License is a permissive Free software license originating from the Massachusetts Institute of Technology (MIT). It places minimal restrictions on reuse, allowing users to use, copy, modify, merge, publish, distribute, sublicense, and sell copies of the software, provided that the copyright notice and permission notice are included in all copies or substantial portions. As one of the shortest and simplest open-source licenses, the MIT License is widely used across many projects, including Node.js, React, jQuery, and Ruby on Rails.
History
The license dates back to the late 1980s when MIT released software with a short permissive notice. Its exact wording was later formalized by the Open Source Initiative (OSI) as a standard open-source license. Variations exist, including the "Expat License" and the "X11 License," each with minor wording differences but equivalent permissions.
Terms and Conditions
The MIT License consists of a single paragraph granting permission to deal in the software without restriction, subject to the inclusion of the above‑mentioned copyright and permission notice. The software is provided "as is", without warranty of any kind. This no‑warranty clause disclaims liability for damages arising from the software's use.
Compatibility and Usage
The MIT License is compatible with many other licenses, including the GNU General Public License (GPL), because its minimal restrictions allow code under the MIT License to be integrated into GPL‑licensed projects. Its simplicity makes it a popular choice for both commercial and non‑commercial software. For the official license text, see MIT License (OSI).
Comparison with Other Licenses
Unlike the BSD licenses (which often include an additional "no endorsement" clause) or the Apache License (which requires a notice file and includes a patent grant), the MIT License is even shorter and does not require any extra attribution statements beyond the copyright notice. This brevity contributes to its widespread adoption.