Template:Infobox software license The Mozilla Public License (MPL) is a free and open source software license. Version 1.0 was developed by Mitchell Baker when she worked as a lawyer at Netscape Communications Corporation and version 1.1 at the Mozilla Foundation.[1] The MPL is characterized as a hybridization of the modified BSD license and GNU General Public License.[2]

The MPL is the license for the Mozilla Application Suite, Mozilla Firefox, Mozilla Thunderbird and other Mozilla software. The MPL has been adapted by others as a license for their software, most notably Sun Microsystems, as the Common Development and Distribution License for OpenSolaris, the open source version of the Solaris 10 operating system, and by Adobe, as the license for its Flex product line.

Terms[edit | edit source]

The license is regarded as a weak copyleft. Specifically, source code copied or changed under the MPL must stay under the MPL. Unlike strong copyleft licenses, the code under the MPL may be combined in a program with proprietary files which would otherwise be derivative works of the MPL code. For example, Netscape 6 and later releases were proprietary versions of the Mozilla Application Suite. For these Netscape releases, AOL Time Warner was also exercising the exclusive rights to proprietary versions that the Netscape Public License provided to itself.

The Free Software Foundation (FSF) considers the license a free software license, but "not a strong copyleft" one. However, "unlike the X11 license" the license has "some complex restrictions" making it incompatible with the GNU GPL. They urge people not to use the license because of this incompatibility unless the provision in section 13 of the MPL is exercised to provide the work under either the GPL or any other GPL-compatible license.[3] The MPL was approved as an open source software license by the Open Source Initiative.

The Mozilla Suite and Firefox have been relicensed under multiple licenses, including the MPL, GPL and LGPL.[4]

MPL-based licenses[edit | edit source]

References[edit | edit source]


External links[edit | edit source]



ar:رخصة موزيلا العمومية ca:Mozilla Public License cs:Mozilla Public License de:Mozilla Public License es:Licencia Pública de Mozilla eu:Mozilla Public License fr:Mozilla Public License ko:모질라 공개 라이선스 it:Mozilla Public License hu:Mozilla Public License nl:Mozilla Public License ja:Mozilla Public License pl:Mozilla Public License pt:Licença pública Mozilla ru:Mozilla Public License fi:Mozilla Public License sv:Mozilla Public License


  1. The Time 100: Mitchell Baker: The "Lizard Wrangler" (Marc Andreessen, Time, 18 April 2005
  2. Andrew M. St. Laurent, Understanding Open Source & Free Software Licensing, pp. 62-63 (O'Reilly 2004)
  3. Free Software Foundation, Various Licenses and Comments about Them: Mozilla Public License, http://www.gnu.org/licenses/license-list.html#MPL
  4. Mozilla Relicensing FAQ
  5. gSOAP Public License
Community content is available under CC-BY-SA unless otherwise noted.