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GNU LESSER GENERAL PUBLIC LICENSE
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Version 2.1, February 1999
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Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Everyone is permitted to copy and distribute verbatim copies
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of this license document, but changing it is not allowed.
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[This is the first released version of the Lesser GPL. It also counts
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as the successor of the GNU Library Public License, version 2, hence
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the version number 2.1.]
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Preamble
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The licenses for most software are designed to take away your
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freedom to share and change it. By contrast, the GNU General Public
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Licenses are intended to guarantee your freedom to share and change
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free software--to make sure the software is free for all its users.
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This license, the Lesser General Public License, applies to some
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specially designated software packages--typically libraries--of the
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Free Software Foundation and other authors who decide to use it. You
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can use it too, but we suggest you first think carefully about whether
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this license or the ordinary General Public License is the better
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strategy to use in any particular case, based on the explanations below.
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When we speak of free software, we are referring to freedom of use,
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not price. Our General Public Licenses are designed to make sure that
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you have the freedom to distribute copies of free software (and charge
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it if you want it; that you can change the software and use pieces of
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it in new free programs; and that you are informed that you can do
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these things.
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To protect your rights, we need to make restrictions that forbid
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distributors to deny you these rights or to ask you to surrender these
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For example, if you distribute copies of the library, whether gratis
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or for a fee, you must give the recipients all the rights that we gave
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you. You must make sure that they, too, receive or can get the source
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We protect your rights with a two-step method: (1) we copyright the
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library, and (2) we offer you this license, which gives you legal
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permission to copy, distribute and/or modify the library.
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To protect each distributor, we want to make it very clear that
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there is no warranty for the free library. Also, if the library is
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author's reputation will not be affected by problems that might be
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introduced by others.
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Finally, software patents pose a constant threat to the existence of
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any patent license obtained for a version of the library must be
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consistent with the full freedom of use specified in this license.
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Most GNU software, including some libraries, is covered by the
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ordinary GNU General Public License. This license, the GNU Lesser
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General Public License, applies to certain designated libraries, and
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is quite different from the ordinary General Public License. We use
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this license for certain libraries in order to permit linking those
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libraries into non-free programs.
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When a program is linked with a library, whether statically or using
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combined work, a derivative of the original library. The ordinary
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General Public License therefore permits such linking only if the
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entire combination fits its criteria of freedom. The Lesser General
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Public License permits more lax criteria for linking other code with
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We call this license the "Lesser" General Public License because it
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does Less to protect the user's freedom than the ordinary General
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Public License. It also provides other free software developers Less
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of an advantage over competing non-free programs. These disadvantages
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are the reason we use the ordinary General Public License for many
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libraries. However, the Lesser license provides advantages in certain
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special circumstances.
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For example, on rare occasions, there may be a special need to
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encourage the widest possible use of a certain library, so that it becomes
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a de-facto standard. To achieve this, non-free programs must be
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allowed to use the library. A more frequent case is that a free
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library does the same job as widely used non-free libraries. In this
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case, there is little to gain by limiting the free library to free
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software only, so we use the Lesser General Public License.
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In other cases, permission to use a particular library in non-free
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programs enables a greater number of people to use a large body of
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free software. For example, permission to use the GNU C Library in
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non-free programs enables many more people to use the whole GNU
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system.
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Although the Lesser General Public License is Less protective of the
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users' freedom, it does ensure that the user of a program that is
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linked with the Library has the freedom and the wherewithal to run
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The precise terms and conditions for copying, distribution and
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modification follow. Pay close attention to the difference between a
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GNU LESSER GENERAL PUBLIC LICENSE
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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0. This License Agreement applies to any software library or other
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If such an object file uses only numerical parameters, data
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END OF TERMS AND CONDITIONS
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How to Apply These Terms to Your New Libraries
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|
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|
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|
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If you develop a new library, and you want it to be of the greatest
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|
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possible use to the public, we recommend making it free software that
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|
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everyone can redistribute and change. You can do so by permitting
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|
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redistribution under these terms (or, alternatively, under the terms of the
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ordinary General Public License).
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|
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|
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To apply these terms, attach the following notices to the library. It is
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|
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safest to attach them to the start of each source file to most effectively
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|
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convey the exclusion of warranty; and each file should have at least the
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<one line to give the library's name and a brief idea of what it does.>
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|
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Copyright (C) <year> <name of author>
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|
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|
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This library is free software; you can redistribute it and/or
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|
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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|
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Lesser General Public License for more details.
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|
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|
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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|
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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|
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|
490 |
Also add information on how to contact you by electronic and paper mail.
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491 |
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|
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You should also get your employer (if you work as a programmer) or your
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|
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school, if any, to sign a "copyright disclaimer" for the library, if
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|
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necessary. Here is a sample; alter the names:
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|
495 |
|
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|
496 |
Yoyodyne, Inc., hereby disclaims all copyright interest in the
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|
497 |
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
|
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|
498 |
|
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|
499 |
<signature of Ty Coon>, 1 April 1990
|
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|
500 |
Ty Coon, President of Vice
|
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|
501 |
|
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|
502 |
That's all there is to it!
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|
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|
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