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Text of the page (random words):
gnu lesser general public license wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 history 2 differences from the gpl 3 compatibility toggle compatibility subsection 3 1 gpl 3 2 expat x11 mit 3 3 apache 4 fsf recommendations on library licensing 5 programming language specifications toggle programming language specifications subsection 5 1 class inheritance 6 see also 7 references 8 external links toggle the table of contents gnu lesser general public license 37 languages العربية asturianu català čeština dansk deutsch español eesti euskara فارسی suomi français עברית magyar bahasa indonesia italiano 日本語 ქართული 한국어 lietuvių മലയാളം bahasa melayu nederlands norsk bokmål polski português русский simple english slovenčina svenska ไทย tagalog türkçe українська اردو tiếng việt 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia free software license gnu lesser general public license logo published 1991 35 years ago 1991 spdx identifier lgpl 3 0 or later lgpl 3 0 only lgpl 2 1 or later lgpl 2 1 only lgpl 2 0 or later lgpl 2 0 only debian fsg compatible yes 1 fsf approved yes 2 osi approved yes 3 gpl compatible yes 2 copyleft yes 2 library or dynamic linking based linking from code with a different license yes website www gnu org licenses lgpl html the gnu lesser general public license lgpl is a free software license published by the free software foundation fsf the license allows developers and companies to use and integrate a software component released under the lgpl into their own even proprietary software without being required by the terms of a strong copyleft license to release the source code of their own components however any developer who modifies an lgpl covered component is required to make their modified version available under the same lgpl license for proprietary software code under the lgpl is usually used in the form of a shared library so that there is a clear separation between the proprietary and lgpl components the lgpl is primarily used for software libraries although it is also used by some stand alone applications the lgpl was developed as a compromise between the strong copyleft of the gnu general public license gpl and more permissive licenses such as the bsd licenses and the mit license the word lesser in the title shows that the lgpl does not guarantee the end user s complete freedom in the use of software it only guarantees the freedom of modification for components licensed under the lgpl but not for any proprietary components history edit the license was originally called the gnu library general public license and was first published in 1991 and adopted the version number 2 for parity with gpl version 2 the lgpl was revised in minor ways in the 2 1 point release published in 1999 when it was renamed the gnu lesser general public license to reflect the fsf s position that not all libraries should use it version 3 of the lgpl was published in 2007 as a list of additional permissions applied to gpl version 3 in addition to the term work based on the program of gpl lgpl version 2 introduced two additional clarification terms work based on the library and work that uses the library 4 lgpl version 3 partially dropped these terms differences from the gpl edit the main difference between the gpl and the lgpl is that the latter allows the work to be linked with in the case of a library used by a non l gpled program regardless of whether it is licensed under a license of gpl family or other licenses 5 in lgpl 2 1 the non l gpled program can then be distributed under any terms if it is not a derivative work if it is a derivative work then the program s terms must allow for modification of the work for the customer s own use and reverse engineering for debugging such modifications whether a work that uses an lgpl program is a derivative work or not is a legal issue a standalone executable that dynamically links to a library through a so dll or similar medium is generally accepted as not being a derivative work as defined by the lgpl it would fall under the definition of a work that uses the library paragraph 5 of the lgpl version 2 1 states a program that contains no derivative of any portion of the library but is designed to work with the library by being compiled or linked with it is called a work that uses the library such a work in isolation is not a derivative work of the library and therefore falls outside the scope of this license essentially if it is a work that uses the library then it must be possible for the software to be linked with a newer version of the lgpl covered program the most commonly used method for doing so is to use a suitable shared library mechanism for linking alternatively a statically linked library is allowed if either source code or linkable object files are provided 6 compatibility edit free software foundation s software licenses list explains the compatibility with many open source licenses gpl edit one feature of the lgpl is the permission to sublicense 7 under the gpl any piece of software which is received under the lgpl see section 3 of the lgpl version 2 1 and section 2 option b of the lgpl version 3 this feature allows for direct reuse of lgpled code in gpled libraries and applications 8 version 3 of the lgpl is not inherently compatible with version 2 of the gpl however works using the latter that have given permission to use a later version of the gpl are compatible 9 a work released under the gplv2 or any later version may be combined with code from a lgpl version 3 library with the combined work as a whole falling under the terms of the gplv3 8 expat x11 mit edit all lgpl versions are compatible with the expat license and the x11 license mit license because all gpl versions are compatible 10 11 and lgpl gives more rights than gpl apache edit lgpl 3 0 is compatible with apache license 2 0 12 lgpl 2 0 and lgpl 2 1 are incompatible with apache license 2 0 12 however if the license condition is either lgpl 2 0 or later or lgpl 2 1 or later then lgpl 3 0 can be chosen to be compatible all lgpl versions are incompatible with apache license version 1 0 and 1 1 13 14 fsf recommendations on library licensing edit the former name gnu library general public license gave some the impression that the fsf recommended that all software libraries should use the lgpl and programs should use the gpl in the 1999 essay why you shouldn t use the lesser gpl for your next library richard stallman explained that while the lgpl had not been deprecated one should not necessarily use the lgpl for all libraries as using gpl can give advantage to free software developers 5 programming language specifications edit the license uses terminology which is mainly intended for applications written in the c programming language or its family franz inc the developers of allegro common lisp published their own preamble to the license to clarify terminology in the lisp context 15 the lgpl with this preamble is sometimes referred to as the llgpl in addition ada has a special feature generics which may prompt the use of the gnat modified general public license gmgpl it allows code to link against or instantiate gmgpl covered units without the code itself becoming covered by the gpl c templates and header only libraries have the same problem as ada generics version 3 of the lgpl addresses such cases in section 3 16 class inheritance edit some concern has risen about the suitability of object oriented classes in lgpl licensed code being inherited by non l gpl code clarification is given on the official gnu website the lgpl does not contain special provisions for inheritance because none are needed inheritance creates derivative works in the same way as traditional linking and the lgpl permits this type of derivative work in the same way as it permits ordinary function calls 17 see also edit free and open source software portal gnu affero general public license gnu free documentation license gnat modified general public license gpl linking exception software using the gnu lesser general public license category references edit license information debian 1 2 3 various licenses and comments about them free software foundation 26 june 2018 retrieved 2 august 2018 licenses standards open source initiative chapter 10 the lesser gpl copyleft and the gnu general public license a comprehensive tutorial and guide 2018 1 2 stallman richard why you shouldn t use the lesser gpl for your next library free software foundation official website gnu lesser general public license section 4 pt d 0 sublicense wiktionary 7 december 2020 1 2 frequently asked questions about the gnu licenses gnu project free software foundation free software foundation official website gnu lesser general public license lgpl version 3 free software foundation official website free software foundation official website free software foundation official website 1 2 free software foundation official website free software foundation official website free software foundation official website franz incorporated 2000 preamble to the gnu lesser general public license the allegro common lisp open source center berkeley ca archived from the original on 2024 12 23 lgplv3 for a c pure template library turner david the lgpl and java gnu official website external links edit official website gnu lesser general public license v3 0 gnu lesser general public license v2 1 this version is deprecated by the fsf gnu lesser general public license v2 0 this version is deprecated by the fsf derivative works lisping copyleft a close reading of the lisp lgpl 5 international free and open source software law review 15 2013 v t e gnu project history gnu manifesto free software foundation europe india latin america history of free software licenses gnu general public license linking exception font exception gnu lesser general public license gnu affero general public license gnu free documentation license gnat modified general public license software gnu variants hurd linux libre glibc bash coreutils findutils build system gcc binutils gdb grub gnustep gimp jami gnu emacs gnu texmacs gnu octave gnu taler gnu r gsl gmp gnu electric gnu archimedes gnunet gnu privacy guard gnuzilla icecat gnu health gnumed gnu lilypond gnu go gnu chess gnash guix more contributors benjamin mako hill bradley m kuhn brian fox federico heinz john sullivan richard m stallman other topics gnu linux naming controversy revolution os free software foundation anti windows campaigns defective by design v t e free software foundation people geoffrey knauth henry poole richard m stallman gerald jay sussman gnu project gnu general public license gnu lesser general public license gnu affero general public license other projects free software directory fsf free software awards free software foundation anti windows campaigns defective by design sister organizations fsf europe fsf latin america fsf india league for programming freedom see also comparison of linux distributions v t e free and open source software general alternative terms for free software comparison of open source and closed source software comparison of source code hosting facilities free software free software project directories long term support open source software open source software development outline timeline software packages audio bioinformatics codecs configuration management drivers graphics wireless health mathematics office suites operating systems routing television video games web applications e commerce android apps ios apps commercial formerly proprietary formerly open source community free software movement history open source software movement events advocacy organisations free software movement of india free software foundation licenses afl apache apsl artistic beerware bsd creative commons cddl epl free software foundation gnu gpl gnu agpl gnu lgpl isc mit mpl python python software foundation license shared source initiative sleepycat unlicense wtfpl zlib types and standards comparison of licenses contributor license agreement copyleft debian free software guidelines definition of free cultural works free license the free software definition the open source definition open source license permissive software license public domain challenges digital rights management license proliferation mozilla software rebranding proprietary device drivers proprietary firmware proprietary software sco linux controversies software patents software security tivoization trusted computing related topics forking gnu manifesto microsoft open specification promise open core model open source hardware shared source initiative source available software the cathedral and the bazaar revolution os portal category retrieved from https en wikipedia org w index php title gnu_lesser_general_public_license oldid 1360260550 categories computer law copyleft copyleft software licenses gnu project hidden categories articles with short description short description is different from wikidata this page was last edited on 20 june 2026 at 07 55 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy 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