MIT许可证（The MIT License）是许多软件授权条款中，被广泛使用的其中一种。与其他常见的软件授权条款（如GPL、LPGL、BSD）相比，MIT是相对宽松的软件授权条款。
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MIT许可证之名源自麻省理工学院(Massachusetts Institute of Technology, MIT)，又称 "X条款" (X License)或 "X11条款" (X11 License)
MIT内容与三条款BSD（3-clause BSD license）内容颇为近似, 但是赋予软件被授权人更大的权利与更少的限制。
有许多团体均采用MIT许可证。例如着名的 ssh 连线软件 PuTTY 与 X Windows System (X11) 即为例子。Expat, Mono 开发平台函式库, Ruby on Rails, Lua 5.0 onwards 等等也都采用 MIT 授权条款。
给予被授权人对软件在使用、重制、修改、合并、出版发行、散布再授权、及贩售软件的重制物上的权利。
被授权人可依照程式上的需要修改授权条款内容成为适用内容。
必须在所有的重制物或在软件实体部份中将着作权声明和允许声明纳入。
此授权条款并非属copyleft的自由软件授权条款，允许在自由/开放源码软件或非自由软件(proprietary software)所使用。
MIT的内容可依照程式着作权者的需求更改内容。 此亦为MIT与BSD（The BSD license, 3-clause BSD license）本质上不同处。
MIT条款可与其他授权条款并存。另外, MIT条款也是自由软件基金会(FSF)所认可的自由软件授权条款，与GPL相容。
以下是MIT条款原文。转载自 [1]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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