Permissive software license

permissivepermissive licensepermissive free software licensepermissive free software licencepermissive free softwarepermissive licensesBSD-style licencepermissively licensedBSD-like licensecopycenter
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Apache License

Apache License 2.0Apache 2.0Apache
Examples include the GNU All-permissive License, MIT License, BSD licenses, Apple Public Source License and Apache license.
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF).

Copyleft

copyleft licenseweak copyleftSoftware hoarding
Permissive licenses do not try to guarantee that future versions of the software will remain free and publicly available, in contrast to copyleft licenses, which have reciprocity requirements which try to enforce this. It is a word play on copyright, copyleft and copy center. The Open Source Initiative defines a permissive software license as a "non-copyleft license".
Copyleft software licenses are considered protective or reciprocal, as contrasted with permissive free-software licenses.

Free software

freefree-softwarefreely
A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software license with minimal requirements about how the software can be redistributed.
They generally advocate permissive free-software licenses, which allow others to use the software as they wish, without being legally forced to provide the source code.

MIT License

MITX11 LicenseMIT Licence
Examples include the GNU All-permissive License, MIT License, BSD licenses, Apple Public Source License and Apache license. Popular modern permissive licenses, as the MIT Licence, the 3-clause BSD licence and the Zlib Licence, don't include advertising clauses and are compatible with many copyleft licenses.
The MIT License is a permissive free software license originating at the Massachusetts Institute of Technology (MIT) in the late 1980s.

Mozilla Public License

MPLMPL 2.0MPL 1.1
It is a weak copyleft license, characterized as a middle ground between permissive free software licenses and the GNU General Public License (GPL), that seeks to balance the concerns of proprietary and open source developers.

License compatibility

compatibleincompatiblecompatibility
Permissive licenses offer more extensive licence compatibility than copyleft licenses, which cannot always be freely combined and mixed.
This "one-way compatibility" characteristic has been criticized by the Apache Foundation, which licenses under the more permissive Apache license, such non-copyleft licenses being often less complicated and making for better license compatibility.

Software license

licenselicensedsoftware licensing
A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software license with minimal requirements about how the software can be redistributed.
Free and open-source licenses are commonly classified into two categories: Those with the aim to have minimal requirements about how the software can be redistributed (permissive licenses), and the protective share-alike (copyleft Licenses).

Copyright

copyright lawcopyrightscopyrighted
It is a word play on copyright, copyleft and copy center.
Further refinements to these definitions have resulted in categories such as copyleft and permissive.

Zlib License

zlibzlib/libpng licenselibpng License
Popular modern permissive licenses, as the MIT Licence, the 3-clause BSD licence and the Zlib Licence, don't include advertising clauses and are compatible with many copyleft licenses.
The zlib license is a permissive free software license which defines the terms under which the zlib software library can be distributed.

Creative Commons license

CC-By-SACC BY-SACC0
The "non-commercial" option included in some Creative Commons licenses is controversial in definition, as it is sometimes unclear what can be considered a non-commercial setting, and application, since its restrictions differ from the principles of open content promoted by other permissive licenses.

GNU General Public License

GPLGNU GPLGPLv2
the MIT licence, a permissive license, is the most popular license in the FOSS domain before a copyleft one, the second placed GPLv2.
This is in distinction to permissive free software licenses, of which the BSD licenses and the MIT License are widely-used less-restrictive examples.

Aladdin Free Public License

AFPLAFP license
Despite the name, the Free Software Foundation does not consider the AFPL a free software license, neither the OSI consider it an open-source license, nor does it fall under the Copyfree Standard definition.

Common Development and Distribution License

CDDLCDDL and GPL legal incompatibilitySun Studio product license
Examples include the CDDL and MsPL.
Like the MPL, the CDDL is a weak copyleft license in-between GPL license and BSD/MIT permissive licenses, requiring only source code files under CDDL to remain under CDDL.

Berkeley Software Distribution

BSDBSD Unix*BSD
The term was presented by computer scientist and Berkeley Software Distribution (BSD) contributor Marshall Kirk McKusick at a BSD conference in 1999.
In the 1980s, BSD was widely adopted by workstation vendors in the form of proprietary Unix variants such as DEC Ultrix and Sun Microsystems SunOS due to its permissive licensing and familiarity to many technology company founders and engineers.

BSD licenses

BSD licenseBSDNew BSD License
Examples include the GNU All-permissive License, MIT License, BSD licenses, Apple Public Source License and Apache license. Popular modern permissive licenses, as the MIT Licence, the 3-clause BSD licence and the Zlib Licence, don't include advertising clauses and are compatible with many copyleft licenses.
BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software.

Free software license

free software licencefree softwarefree software licenses
These early licenses were of the "permissive " kind.

Public-domain-equivalent license

Public domain equivalent licensepublic domain like licensepublic domain
This is achieved by a public-domain waiver statement and a fall-back all-permissive license, for cases where the waiver is not valid.

Free and open-source software

free and open-sourcefree and open source softwareFOSS
While always an important part of the free and open-source software (FOSS) license landscape, since around 2010, several authors noted a raising popularity of the permissive licenses in contrast to the copyleft license.
Apple, a user of GCC and a heavy user of both DRM and patents, switched the compiler in its Xcode IDE from GCC to Clang, which is another FOSS compiler but is under a permissive license.

Comparison of free and open-source software licenses

List of software licensesfree software licensesComparison of free software licenses
The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL.

Apple Public Source License

APSLApple Public SourceAPSL 2.0
Examples include the GNU All-permissive License, MIT License, BSD licenses, Apple Public Source License and Apache license.

Open Source Initiative

OSIOpen Source Initiative (OSI)Open Source software
The Open Source Initiative defines a permissive software license as a "non-copyleft license".

GitHub

github.comGistGitHub Pages
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."