AGPL linking exception modifies theGNU General Public License (GPL) in a way that enables software projects which providelibrary code to be "linked to" the programs that use them, without applying the full terms of the GPL to the using program. Linking is the technical process of connecting code in a library to the using code, to produce a singleexecutable file. It is performed either atcompile time orrun-time in order to produce functional machine-readable code. The Free Software Foundation states that, without applying thelinking exception, a program linked to GPL library code may only be distributed under a GPL-compatible license.[1] This has not been explicitly tested in court, but linking violations have resulted in settlement.[2] The license of theGNU Classpath project explicitly includes a statement to that effect.
Many free software libraries which are distributed under the GPL use an equivalent exception, although the wording of the exception varies. Notable projects includeERIKA Enterprise,[3]GNU Guile,[4] the run-time libraries ofGNAT,[4]GNU Classpath[5] and theGCC Runtime Library Exception.[6]
Compiler runtime libraries also often use this license modification or an equivalent one, e.g. thelibgcc library in theGNU Compiler Collection,[7] as well as all libraries of theFree Pascal project.
In 2007, Sun Microsystems released most of thesource code to theclass libraries for theJava SE andJava EE projects under version 2 of the GPL license plus the Classpath linking exception,[8] and used the same license as one possible license for their enterprise serverGlassFish[9] and for theirNetBeans JavaIDE.[10]
Version 3 of theGNU Lesser General Public License (LGPL)[11] is likewise constructed as an exception to the GPL.[12]
TheGNU Classpath project provides an example of the use of such a GPL linking exception. The GNU Classpath library uses the following license:
Classpath is distributed under the terms of the GNU General Public License with the following clarification and special exception.
Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination.
As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obliged to do so. If you do not wish to do so, delete this exception statement from your version.
As such, it can be used to run, create and distribute a large class of applications and applets. When GNU Classpath is used unmodified as the core class library for a virtual machine, compiler for the Java language, or for a program written in the Java programming language, it does not affect the licensing for distributing those programs directly.[5]
While version 2.1 of the LGPL was a standalone licence, the currentLGPL version 3 is based on a reference to the GPL.
Compared to the GNU Classpath license above, the LGPL formulates more requirements to the linking exception: licensees must allow modification of the portions of the library they use and reverse engineering (of their software and the library) for debugging such modifications.[citation needed]
Works related toGPL linking exception at Wikisource
