Katana VentraIP

Free-software license

A free-software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that software. These actions are usually prohibited by copyright law, but the rights-holder (usually the author) of a piece of software can remove these restrictions by accompanying the software with a software license which grants the recipient these rights. Software using such a license is free software (or free and open-source software) as conferred by the copyright holder. Free-software licenses are applied to software in source code and also binary object-code form, as the copyright law recognizes both forms.[2]

Market share[edit]

While historically the most widely used FOSS license has been the GPLv2, in 2015, according to Black Duck Software[37] the permissive MIT license dethroned the GPLv2 to the second place while the permissive Apache License follows at third place. A study from 2012, which used publicly available data, criticized Black Duck Software for not publishing their methodology used in collecting statistics.[78] Daniel German, professor in the Department of Computer Science at the University of Victoria in Canada, presented a talk in 2013 about the methodological challenges in determining which are the most widely used free-software licenses, and showed how he could not replicate the result from Black Duck Software.[79]


A GitHub study in 2015 on their statistical data found that the MIT license was the most prominent FOSS license on that platform.[38]


In June 2016 an analysis of the Fedora Project's packages showed as most used licenses the GPL family, followed by MIT, BSD, the LGP family, Artistic (for Perl packages), LPPL (for texlive packages), and ASL. The GNU GPLv2+ was the single most popular license[39]

Comparison of free and open-source software licenses

Developer Certificate of Origin

End-user license agreement

License-free software

List of free-content licences

Public domain

Software license

(22 July 2004). Open Source Licensing: Software Freedom and Intellectual Property Law. Prentice Hall. ISBN 978-0-13-148787-1.

Rosen, Lawrence

by the Free Software Foundation.

The Free Software Definition

The Free Software Foundation's list of free and non-free licenses

Debian's license information page

Open Source Initiative's list of licenses

by Andrew M. St. Laurent

Understanding Open Source and Free Software Licensing

by Software Freedom Law Center

A 45-page licensing primer

Katana VentraIP

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