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46
Preamble
The licenses for most software are designed to take away your freedom to share and change it. By contrast, the
GNU General Public Licenses are intended to guarantee your freedom to share and change free software--to make
sure the software is free for all its users. This license, the Lesser General Public License, applies to some specially
designated software packages--typically libraries--of the Free Software Foundation and other authors who decide
to use it. You can use it too, but we suggest you first think carefully about whether this license or the ordinary
General Public License is the better strategy to use in any particular case, based on the explanations below.
When we speak of free software, we are referring to freedom of use, not price. Our General Public Licenses are
designed to make sure that you have the freedom to distribute copies of free software (and charge for this service
if you wish); that you receive source code or can get it if you want it; that you can change the software and use
pieces of it in new free programs; and that you are informed that you can do these things.
To protect your rights, we need to make restrictions that forbid distributors to deny you these rights or to ask you to
surrender these rights. These restrictions translate to certain responsibilities for you if you distribute copies of the
library or if you modify it.
For example, if you distribute copies of the library, whether gratis or for a fee, you must give the recipients all the
rights that we gave you. You must make sure that they, too, receive or can get the source code. If you link other
code with the library, you must provide complete object files to the recipients, so that they can relink them with the
library after making changes to the library and recompiling it. And you must show them these terms so they know
their rights.
We protect your rights with a two-step method: (1) we copyright the library, and (2) we offer you this license, which
gives you legal permission to copy, distribute and/or modify the library.
To protect each distributor, we want to make it very clear that there is no warranty for the free library. Also, if the
library is modified by someone else and passed on, the recipients should know that what they have is not the
original version, so that the original author's reputation will not be affected by problems that might be introduced by
others.
Finally, software patents pose a constant threat to the existence of any free program. We wish to make sure that a
company cannot effectively restrict the users of a free program by obtaining a restrictive license from a patent
holder. Therefore, we insist that any patent license obtained for a version of the library must be consistent with the
full freedom of use specified in this license. Most GNU software, including some libraries, is covered by the
ordinary GNU General Public License. This license, the GNU Lesser General Public License, applies to certain
designated libraries, and is quite different from the ordinary General Public License. We use this license for certain
libraries in order to permit linking those libraries into non-free programs.
When a program is linked with a library, whether statically or using a shared library, the combination of the two is
legally speaking a combined work, a derivative of the original library. The ordinary General Public License
therefore permits such linking only if the entire combination fits its criteria of freedom. The Lesser General Public
License permits more lax criteria for linking other code with the library. We call this license the "Lesser" General
Public License because it does Less to protect the user's freedom than the ordinary General Public License. It
also provides other free software developers Less of an advantage over competing non-free programs. These
disadvantages are the reason we use the ordinary General Public License for many libraries. However, the Lesser
license provides advantages in certain special circumstances. For example, on rare occasions, there may be a
special need to encourage the widest possible use of a certain library, so that it becomes a de-facto standard. To
achieve this, non-free programs must be allowed to use the library. A more frequent case is that a free library does
the same job as widely used non-free libraries. In this case, there is little to gain by limiting the free library to free
software only, so we use the Lesser General Public License. In other cases, permission to use a particular library
in non-free programs enables a greater number of people to use a large body of free software. For example,
permission to use the GNU C Library in non-free programs enables many more people to use the whole GNU
operating system, as well as its variant, the GNU/Linux operating system. Although the Lesser General Public
License is Less protective of the users' freedom, it does ensure that the user of a program that is linked with the
Library has the freedom and the wherewithal to run that program using a modified version of the Library. The
precise terms and conditions for copying, distribution and modification follow. Pay close attention to the difference
between a "work based on the library" and a "work that uses the library". The former contains code derived from
the library, whereas the latter must be combined with the library in order to run.
GNU LESSER GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License Agreement
applies to any software library or other program which contains a notice placed by the copyright holder or other
authorized party saying it may be distributed under the terms of this Lesser General Public License (also called