Permissive free software licences

A permissive software license, sometimes also called BSD-like or BSD-style license, is a free software software license with minimal requirements about how the software can be redistributed. Examples include the MIT License, BSD licenses, Apple Public Source License and the Apache license. As of 2016,^[update] the most popular free software license is the permissive MIT license.

The Open Source Initiative defines a permissive software license as a "non-copyleft license".GitHub's choosealicense website described the MIT permissive license as, "lets people do anything they want with your code as long as they provide attribution back to you and don’t hold you liable."California Western School of Law's newmediarights.com defined them as follows: "The ‘BSD-like’ licenses such as the BSD, MIT, and Apache licenses are extremely permissive, requiring little more than attributing the original portions of the licensed code to the original developers in your own code and/or documentation.".

Copycenter is a term originally used to explain the modified BSD licence, a permissive free software license. The term was presented by Kirk McKusick, a computer scientist famous for his work on BSD, during one of his speeches at BSDCon 1999. It is a word play on copyright, copyleft and copy center.

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