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- GNU GENERAL PUBLIC LICENSE
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- Version 2, June 1991
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+ GNU LESSER GENERAL PUBLIC LICENSE
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+ Version 2.1, February 1999
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- Copyright (C) 1989, 1991 Free Software Foundation, Inc., <http://fsf.org/>
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- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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+ 51 Franklin Street, 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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+
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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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-License is intended to guarantee your freedom to share and change free
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-software--to make sure the software is free for all its users. This
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-General Public License applies to most of the Free Software
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-Foundation's software and to any other program whose authors commit to
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-using it. (Some other Free Software Foundation software is covered by
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-the GNU Lesser General Public License instead.) You can apply it to
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-your programs, too.
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-
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- When we speak of free software, we are referring to freedom, not
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-price. Our General Public Licenses are designed to make sure that you
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-have the freedom to distribute copies of free software (and charge for
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-this service if you wish), that you receive source code or can get it
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-if you want it, that you can change the software or use pieces of it
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-in new free programs; and that you know you can do these things.
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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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+
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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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+
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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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+for this service if you wish); that you receive source code or can get
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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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-anyone to deny you these rights or to ask you to surrender the rights.
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-These restrictions translate to certain responsibilities for you if you
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-distribute copies of the software, or if you modify it.
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-
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- For example, if you distribute copies of such a program, whether
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-gratis or for a fee, you must give the recipients all the rights that
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-you have. You must make sure that they, too, receive or can get the
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-source code. And you must show them these terms so they know their
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-rights.
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-
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- We protect your rights with two steps: (1) copyright the software, and
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-(2) offer you this license which gives you legal permission to copy,
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-distribute and/or modify the software.
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-
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- Also, for each author's protection and ours, we want to make certain
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-that everyone understands that there is no warranty for this free
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-software. If the software is modified by someone else and passed on, we
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-want its recipients to know that what they have is not the original, so
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-that any problems introduced by others will not reflect on the original
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-authors' reputations.
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-
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- Finally, any free program is threatened constantly by software
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-patents. We wish to avoid the danger that redistributors of a free
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-program will individually obtain patent licenses, in effect making the
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-program proprietary. To prevent this, we have made it clear that any
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-patent must be licensed for everyone's free use or not licensed at all.
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+distributors to deny you these rights or to ask you to surrender these
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+rights. These restrictions translate to certain responsibilities for
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+you if you distribute copies of the library or if you modify it.
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+
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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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+code. If you link other code with the library, you must provide
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+complete object files to the recipients, so that they can relink them
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+with the library after making changes to the library and recompiling
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+it. And you must show them these terms so they know their rights.
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+
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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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+
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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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+modified by someone else and passed on, the recipients should know
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+that what they have is not the original version, so that the original
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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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+
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+ Finally, software patents pose a constant threat to the existence of
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+any free program. We wish to make sure that a company cannot
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+effectively restrict the users of a free program by obtaining a
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+restrictive license from a patent holder. Therefore, we insist that
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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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+
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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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+
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+ When a program is linked with a library, whether statically or using
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+a shared library, the combination of the two is legally speaking a
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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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+the library.
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+
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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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+
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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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+
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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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+operating system, as well as its variant, the GNU/Linux operating
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+system.
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+
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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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+that program using a modified version of the Library.
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The precise terms and conditions for copying, distribution and
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-modification follow.
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+modification follow. Pay close attention to the difference between a
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+"work based on the library" and a "work that uses the library". The
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+former contains code derived from the library, whereas the latter must
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+be combined with the library in order to run.
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- GNU GENERAL PUBLIC LICENSE
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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 applies to any program or other work which contains
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-a notice placed by the copyright holder saying it may be distributed
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-under the terms of this General Public License. The "Program", below,
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-refers to any such program or work, and a "work based on the Program"
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-means either the Program or any derivative work under copyright law:
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-that is to say, a work containing the Program or a portion of it,
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-either verbatim or with modifications and/or translated into another
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-language. (Hereinafter, translation is included without limitation in
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-the term "modification".) Each licensee is addressed as "you".
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-
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-Activities other than copying, distribution and modification are not
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+ 0. This License Agreement applies to any software library or other
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+program which contains a notice placed by the copyright holder or
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+other authorized party saying it may be distributed under the terms of
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+this Lesser General Public License (also called "this License").
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+Each licensee is addressed as "you".
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+
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+ A "library" means a collection of software functions and/or data
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+prepared so as to be conveniently linked with application programs
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+(which use some of those functions and data) to form executables.
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+
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+ The "Library", below, refers to any such software library or work
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+which has been distributed under these terms. A "work based on the
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+Library" means either the Library or any derivative work under
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+copyright law: that is to say, a work containing the Library or a
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+portion of it, either verbatim or with modifications and/or translated
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+straightforwardly into another language. (Hereinafter, translation is
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+included without limitation in the term "modification".)
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+
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+ "Source code" for a work means the preferred form of the work for
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+making modifications to it. For a library, complete source code means
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+all the source code for all modules it contains, plus any associated
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+interface definition files, plus the scripts used to control compilation
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+and installation of the library.
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+
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+ Activities other than copying, distribution and modification are not
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covered by this License; they are outside its scope. The act of
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-running the Program is not restricted, and the output from the Program
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- 1. You may copy and distribute verbatim copies of the Program's
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-source code as you receive it, in any medium, provided that you
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-conspicuously and appropriately publish on each copy an appropriate
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-copyright notice and disclaimer of warranty; keep intact all the
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+ 1. You may copy and distribute verbatim copies of the Library's
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+complete source code as you receive it, in any medium, provided that
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+you conspicuously and appropriately publish on each copy an
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+appropriate copyright notice and disclaimer of warranty; keep intact
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+all the notices that refer to this License and to the absence of any
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+warranty; and distribute a copy of this License along with the
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+Library.
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+
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+ You may charge a fee for the physical act of transferring a copy,
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+and you may at your option offer warranty protection in exchange for a
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distribute such modifications or work under the terms of Section 1
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above, provided that you also meet all of these conditions:
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- a) You must cause the modified files to carry prominent notices
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+ a) The modified work must itself be a software library.
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+
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+ b) You must cause the files modified to carry prominent notices
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stating that you changed the files and the date of any change.
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-
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- c) If the modified program normally reads commands interactively
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+ c) You must cause the whole of the work to be licensed at no
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+
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+ d) If a facility in the modified Library refers to a function or a
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+ table of data to be supplied by an application program that uses
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+ the facility, other than as an argument passed when the facility
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+ is invoked, then you must make a good faith effort to ensure that,
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+ in the event an application does not supply such function or
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+ table, the facility still operates, and performs whatever part of
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+ (For example, a function in a library to compute square roots has
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+ be optional: if the application does not supply it, the square
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+ root function must still compute square roots.)
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These requirements apply to the modified work as a whole. If
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-identifiable sections of that work are not derived from the Program,
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and can be reasonably considered independent and separate works in
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-on the Program, the distribution of the whole must be on the terms of
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+on the Library, the distribution of the whole must be on the terms of
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this License, whose permissions for other licensees extend to the
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-entire whole, and thus to each and every part regardless of who wrote it.
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+it.
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Thus, it is not the intent of this section to claim rights or contest
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a storage or distribution medium does not bring the other work under
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the scope of this License.
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- 3. You may copy and distribute the Program (or a work based on it,
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-under Section 2) in object code or executable form under the terms of
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- a) Accompany it with the complete corresponding machine-readable
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-associated interface definition files, plus the scripts used to
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-control compilation and installation of the executable. However, as a
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-special exception, the source code distributed need not include
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-form) with the major components (compiler, kernel, and so on) of the
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-operating system on which the executable runs, unless that component
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-access to copy the source code from the same place counts as
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-distribution of the source code, even though third parties are not
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+ 3. You may opt to apply the terms of the ordinary GNU General Public
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+License instead of this License to a given copy of the Library. To do
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+this, you must alter all the notices that refer to this License, so
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+that they refer to the ordinary GNU General Public License, version 2,
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+instead of to this License. (If a newer version than version 2 of the
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+ordinary GNU General Public License has appeared, then you can specify
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+ 4. You may copy and distribute the Library (or a portion or
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+it with the complete corresponding machine-readable source code, which
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+must be distributed under the terms of Sections 1 and 2 above on a
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+medium customarily used for software interchange.
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|
-
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-The hypothetical commands `show w' and `show c' should show the appropriate
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-parts of the General Public License. Of course, the commands you use may
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-be called something other than `show w' and `show c'; they could even be
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-mouse-clicks or menu items--whatever suits your program.
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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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-school, if any, to sign a "copyright disclaimer" for the program, if
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+school, if any, to sign a "copyright disclaimer" for the library, if
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necessary. Here is a sample; alter the names:
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- Yoyodyne, Inc., hereby disclaims all copyright interest in the program
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- `Gnomovision' (which makes passes at compilers) written by James Hacker.
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+ Yoyodyne, Inc., hereby disclaims all copyright interest in the
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+ library `Frob' (a library for tweaking knobs) written by James Random
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+ Hacker.
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- {signature of Ty Coon}, 1 April 1989
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+ {signature of Ty Coon}, 1 April 1990
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Ty Coon, President of Vice
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-This General Public License does not permit incorporating your program into
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-proprietary programs. If your program is a subroutine library, you may
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-consider it more useful to permit linking proprietary applications with the
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-library. If this is what you want to do, use the GNU Lesser General
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-Public License instead of this License.
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+That's all there is to it!
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guozhanxin
