MIT

MIT許可證之名源自麻省理工學院（Massachusetts Institute of Technology, MIT），又稱「X條款」（X License）或「X11條款」（X11 License）

MIT內容與三條款BSD許可證（3-clause BSD license）內容頗為近似，但是賦予軟件被授權人更大的權利與更少的限制。

被授權人有權利使用、複製、修改、合併、出版發行、散佈、再授權及販售軟件及軟件的副本。

被授權人可根據程式的需要修改授權條款為適當的內容。

在軟件和軟件的所有副本中都必須包含版權聲明和許可聲明。

此授權條款並非屬copyleft的自由軟件授權條款，允許在自由/開放源碼軟件或非自由軟件（proprietary software）所使用。

此亦為MIT與BSD（The BSD license, 3-clause BSD license）本質上不同處。

MIT條款可與其他授權條款並存。另外，MIT條款也是自由軟件基金會（FSF）所認可的自由軟件授權條款，與GPL相容。

有許多團體均採用MIT許可證。例如著名的SSH連線軟件PuTTY與X窗口系統即為例子。Expat、Mono開發平台庫、Ruby on Rails、Lua等等也都採用MIT許可協議。

Copyright <YEAR> <COPYRIGHT HOLDER>

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. ^[1] 

<YEAR>表示年份，<COPYRIGHT HOLDER>表示版權方名稱