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GNU LESSER GENERAL PUBLIC
LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foun-
dation, Inc., 59 Temple Place, Suite 330, Bos-
ton, MA 02111-1307 USA
Everyone is permitted to copy and distribute
verbatim copies of this license document, but
changing it is not allowed.
[This is the first released version of the Lesser
GPL. It also counts as the successor of the GNU
Library Public License, version 2, hence the ver-
sion number 2.1.]
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 Soft-
ware 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
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based on the explanations below.
When we speak of free software, we are refer-
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To protect your rights, we need to make restric-
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These restrictions translate to certain responsi-
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We protect your rights with a two-step method:
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To protect each distributor, we want to make it
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Finally, software patents pose a constant threat
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fore, 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
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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 ordi-
nary 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
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combination fits its criteria of freedom. The
Lesser General Public License permits more lax
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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 compet-
ing 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
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For example, on rare occasions, there may be a
special need to encourage the widest possible
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facto standard. To achieve this, non-free pro-
grams 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
Appendix
37

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