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GNU Lesser General Public License

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One feature of the LGPL is the permission to sublicense 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.
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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: a work released under the GPLv2 "or any later version" may be combined with code from a LGPL version 3 library,
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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. In LGPL 2.1, the non-(L)GPLed program can then be
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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
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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
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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
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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
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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". LGPL version 3 partially dropped these terms.
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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
282:, 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: 1434: 1513: 1732: 1354: 113: 100: 1571: 1149: 1503: 1975: 1241: 1111: 1523: 1409: 1508: 1491: 1461: 1359: 1637: 1471: 1444: 1424: 1449: 270:
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
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gave some the impression that the FSF recommended that all software libraries should use the LGPL and programs should use the GPL. In 1999 essay
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On the other hand, the FSF sometimes advocate for even less restrictive licenses. For example, Stallman endorsed the use of
1842: 1737: 1561: 1551: 1335: 731: 333:, one should not necessarily use the LGPL for all libraries, as using GPL can give advantage to free-software developers. 1908: 1762: 1556: 1099: 1870: 1777: 1612: 705:
Lisping Copyleft: A Close Reading of the Lisp LGPL, 5 International Free and Open Source Software Law Review 15 (2013)
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it. Version 3 of the LGPL was published in 2007 as a list of additional permissions applied to GPL version 3.
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Some concern has risen about the suitability of object-oriented classes in LGPL-licensed code being
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have the same problem as Ada generics. Version 3 of the LGPL addresses such cases in section 3.
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Frequently Asked Questions about the GNU Licenses - GNU Project - Free Software Foundation
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The license uses terminology which is mainly intended for applications written in the
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Copyleft and the GNU General Public License: A Comprehensive Tutorial and Guide
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context. The LGPL with this preamble is sometimes referred to as the LLGPL.
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by non-(L)GPL code. Clarification is given on the official GNU website:
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with the combined work as a whole falling under the terms of the GPLv3.
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is allowed if either source code or linkable object files are provided.
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Richard Stallman explained that while the LGPL had not been
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Why you shouldn't use the Lesser GPL for your next library
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Why you shouldn't use the Lesser GPL for your next library
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The LGPL was developed as a compromise between the strong
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Re: Xiph.org announces Vorbis Beta 4 and the Xiph.org
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Comparison of open-source and closed-source software
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Alternatively, a 317:FSF recommendations on library licensing 463: 1976:Free and open-source software licenses 244:The license was originally called the 29: 483: 481: 479: 7: 1883:Microsoft Open Specification Promise 830:GNAT Modified General Public License 443:GNAT Modified General Public License 425:Free and open-source software portal 377:GNAT Modified General Public License 1350:Alternative terms for free software 348:Programming language specifications 1690:Python Software Foundation License 453:Software using the LGPL (category) 375:, which may prompt the use of the 344:project in its libraries in 2001. 323:GNU Library General Public License 246:GNU Library General Public License 25: 1753:Definition of Free Cultural Works 1370:Free software project directories 1294:Comparison of Linux distributions 1216:GNU Affero General Public License 1211:GNU Lesser General Public License 820:GNU Affero General Public License 815:GNU Lesser General Public License 433:GNU Affero General Public License 182:GNU Lesser General Public License 31:GNU Lesser General Public License 1940: 1939: 1929: 1390:Open-source software development 417: 140:library or dynamic linking-based 1748:Debian Free Software Guidelines 1580:Free Software Movement of India 1278:League for Programming Freedom 825:GNU Free Documentation License 438:GNU Free Documentation License 1: 1738:Contributor License Agreement 1552:Open-source-software movement 1336:Free and open-source software 1909:The Cathedral and the Bazaar 1763:The Free Software Definition 1100:GNU/Linux naming controversy 527:"Chapter 10. The Lesser GPL" 1813:Mozilla software rebranding 1778:Permissive software license 53:; 33 years ago 2002: 1981:Copyleft software licenses 1818:Proprietary device drivers 1768:The Open Source Definition 1206:GNU General Public License 798:GNU General Public License 222:GNU General Public License 1925: 1903:Source-available software 1803:Digital rights management 298:statically linked library 35: 1898:Shared Source Initiative 1695:Shared Source Initiative 1648:Free Software Foundation 1585:Free Software Foundation 1435:Configuration management 1237:FSF Free Software Awards 1159:Free Software Foundation 782:History of free software 760:Free Software Foundation 614:Free Software Foundation 598:Free Software Foundation 552:Free Software Foundation 514:Licenses & Standards 493:Free Software Foundation 257:Differences from the GPL 194:Free Software Foundation 1833:SCO/Linux controversies 1232:Free Software Directory 371:has a special feature, 274:to a library through a 1733:Comparison of licenses 1542:Free software movement 516:Open Source Initiative 354:C programming language 1808:License proliferation 448:GPL linking exception 387:header-only libraries 228:licenses such as the 190:free-software license 88:Debian FSG compatible 27:Free-software license 1893:Open-source hardware 1828:Proprietary software 1823:Proprietary firmware 1524:Formerly open-source 1519:Formerly proprietary 1385:Open-source software 1256:Sister organizations 546:Stallman, Richard. " 1773:Open-source license 1375:Gratis versus libre 1247:Defective by Design 1183:Richard M. Stallman 1117:Defective by Design 1084:Richard M. Stallman 625:Stallman, Richard. 471:License information 358:Allegro Common Lisp 268:reverse engineering 32: 1188:Gerald Jay Sussman 1049:Benjamin Mako Hill 680:LGPL Official Page 583:. 7 December 2020. 211:software libraries 1953: 1952: 1853:Trusted Computing 1843:Software security 1791: 1790: 1472:Operating systems 1380:Long-term support 1302: 1301: 1268:FSF Latin America 1125: 1124: 1069:Georg C. F. Greve 976:GNU Privacy Guard 803:linking exception 667:official website. 661:The LGPL and Java 616:official website. 600:official website. 554:official website. 393:Class inheritance 272:dynamically links 192:published by the 178: 177: 80:LGPL-2.0-or-later 76:LGPL-2.1-or-later 72:LGPL-3.0-or-later 16:(Redirected from 1993: 1943: 1942: 1933: 1838:Software patents 1721: 1633:Creative Commons 1492:Web applications 1329: 1322: 1315: 1306: 1152: 1145: 1138: 1129: 734: 727: 720: 711: 700:Derivative Works 695:LGPL-2.0 license 690:LGPL-2.1 license 685:LGPL-3.0 license 668: 657: 651: 646: 640: 635: 629: 623: 617: 607: 601: 591: 585: 584: 573: 567: 561: 555: 544: 535: 534: 523: 517: 511: 505: 504: 502: 500: 485: 474: 468: 427: 422: 421: 420: 321:The former name 174: 171: 169: 167: 165: 163: 61: 59: 54: 40: 33: 21: 2001: 2000: 1996: 1995: 1994: 1992: 1991: 1990: 1956: 1955: 1954: 1949: 1921: 1888:Open-core model 1863: 1857: 1787: 1725: 1719: 1589: 1566: 1528: 1411: 1404: 1338: 1333: 1303: 1298: 1282: 1251: 1220: 1192: 1173:Geoffrey Knauth 1161: 1156: 1126: 1121: 1088: 1054:Bradley M. Kuhn 1044:Alexandre Oliva 1032: 834: 786: 743: 738: 676: 671: 659:Turner, David. 658: 654: 647: 643: 636: 632: 624: 620: 608: 604: 592: 588: 575: 574: 570: 562: 558: 545: 538: 525: 524: 520: 512: 508: 498: 496: 487: 486: 477: 469: 465: 461: 423: 418: 416: 413: 395: 350: 340:license by the 319: 306: 264:derivative work 259: 242: 224:(GPL) and more 160: 81: 79: 77: 75: 73: 57: 55: 52: 43: 28: 23: 22: 15: 12: 11: 5: 1999: 1997: 1989: 1988: 1983: 1978: 1973: 1968: 1958: 1957: 1951: 1950: 1948: 1947: 1937: 1926: 1923: 1922: 1920: 1919: 1912: 1905: 1900: 1895: 1890: 1885: 1880: 1873: 1867: 1865: 1859: 1858: 1856: 1855: 1850: 1845: 1840: 1835: 1830: 1825: 1820: 1815: 1810: 1805: 1799: 1797: 1793: 1792: 1789: 1788: 1786: 1785: 1780: 1775: 1770: 1765: 1760: 1755: 1750: 1745: 1740: 1735: 1729: 1727: 1718: 1717: 1712: 1707: 1702: 1697: 1692: 1687: 1682: 1677: 1672: 1667: 1666: 1665: 1660: 1655: 1645: 1640: 1635: 1630: 1625: 1620: 1615: 1610: 1605: 1599: 1597: 1591: 1590: 1588: 1587: 1582: 1576: 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Index

LGPL
Logo
SPDX
Debian FSG compatible
FSF
approved
OSI
approved
GPL compatible
Copyleft
library or dynamic linking-based
Linking from code with a different licence
www.gnu.org/copyleft/lesser.html
free-software license
Free Software Foundation
proprietary
copyleft
shared library
software libraries
copyleft
GNU General Public License
permissive
BSD licenses
MIT License
derivative work
reverse engineering
dynamically links
.so
.dll
shared library

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