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Encyclopedia > GNU LGPL
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The GNU Lesser General Public License (formerly the GNU Library General Public License) is an FSF approved Free Software license designed as a compromise between the GNU General Public License and simple permissive licenses such as the BSD license and the MIT License. It was written in 2000 by Richard Stallman and Eben Moglen.


It places a copyleft restriction on individual source code files but does not copyleft the program as a whole provided you use "a suitable shared library mechanism for linking" and follow certain other restrictions. The license is primarily intended for software libraries, although it is also used by applications such as OpenOffice.org.


The main difference between the GPL and the LGPL is that the latter can be linked to a non-(L)GPLed program, which may be free software or proprietary.


One feature of the LGPL is that you can convert any LGPLed piece of software into a GPLed piece of software (section 3 of the license). This is useful if you want to create a version of the code that proprietary software companies cannot use in non-free software products.


The LGPL is now deprecated, but still considered valid, by the FSF, on the grounds that a GPLed library forces the software using it to be under the GPL also, and hence creates more free software.


External links

  • Text of the LGPL (http://www.gnu.org/licenses/lgpl.html)
  • "Why you shouldn't use the Library GPL for your next library" (http://www.gnu.org/licenses/why-not-lgpl.html) by Richard Stallman

See also


  Results from FactBites:
 
GNU Lesser General Public License - Wikipedia, the free encyclopedia (585 words)
The GNU Lesser General Public License (formerly the GNU Library General Public License) is an FSF approved Free Software license designed as a compromise between the GNU General Public License and simple permissive licenses such as the BSD license and the MIT License.
The LGPL is primarily intended for software libraries, although it is also used by applications such as OpenOffice.org and Mozilla.
In 1999, Richard Stallman wrote an essay explaining why this was not the case, and that one shouldn't necessarily use the LGPL for libraries.
GK's C code: About the LGPL (1272 words)
It is important to understand the difference between the LGPL and the GNU General Public License ("GPL").
Section 6 of the LGPL applies to this work as soon as you distribute it, saying that the derived work can be distributed "under the terms of your choice, provided that...", and goes on to describe the responsibilities of someone distributing the derived work.
Most confusion about the LGPL revolves around this basic property: Section 6 of the LGPL constrains (mildly) how you distribute compiled software using a LGPL'd library, but because those constraints are not the same as the LGPL, the LGPL does not propagate itself in the same way that the GPL does.
  More results at FactBites »


 
 

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