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- GNU GENERAL PUBLIC LICENSE
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- Version 3, 29 June 2007
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+ GNU LESSER GENERAL PUBLIC LICENSE
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+ Version 2.1, February 1999
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- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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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 GNU General Public License is a free, copyleft license for
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-software and other kinds of works.
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-
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- The licenses for most software and other practical works are designed
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-to take away your freedom to share and change the works. By contrast,
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-the GNU General Public License is intended to guarantee your freedom to
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-share and change all versions of a program--to make sure it remains free
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-software for all its users. We, the Free Software Foundation, use the
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-GNU General Public License for most of our software; it applies also to
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-any other work released this way by its authors. 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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-them if you wish), that you receive source code or can get it if you
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-want it, that you can change the software or use pieces of it in new
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-free programs, and that you know you can do these things.
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-
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- To protect your rights, we need to prevent others from denying you
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-these rights or asking you to surrender the rights. Therefore, you have
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-certain responsibilities if you distribute copies of the software, or if
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-you modify it: responsibilities to respect the freedom of others.
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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 pass on to the recipients the same
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-freedoms that you received. You must make sure that they, too, receive
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-or can get the source code. And you must show them these terms so they
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-know their rights.
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-
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- Developers that use the GNU GPL protect your rights with two steps:
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-(1) assert copyright on the software, and (2) offer you this License
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-giving you legal permission to copy, distribute and/or modify it.
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-
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- For the developers' and authors' protection, the GPL clearly explains
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-that there is no warranty for this free software. For both users' and
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-authors' sake, the GPL requires that modified versions be marked as
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-changed, so that their problems will not be attributed erroneously to
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-authors of previous versions.
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-
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- Some devices are designed to deny users access to install or run
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-modified versions of the software inside them, although the manufacturer
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-can do so. This is fundamentally incompatible with the aim of
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-protecting users' freedom to change the software. The systematic
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-pattern of such abuse occurs in the area of products for individuals to
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-use, which is precisely where it is most unacceptable. Therefore, we
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-have designed this version of the GPL to prohibit the practice for those
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-products. If such problems arise substantially in other domains, we
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-stand ready to extend this provision to those domains in future versions
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-of the GPL, as needed to protect the freedom of users.
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-
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- Finally, every program is threatened constantly by software patents.
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-States should not allow patents to restrict development and use of
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-software on general-purpose computers, but in those that do, we wish to
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-avoid the special danger that patents applied to a free program could
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-make it effectively proprietary. To prevent this, the GPL assures that
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-patents cannot be used to render the program non-free.
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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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+
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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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+
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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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+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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-
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- TERMS AND CONDITIONS
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-
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- 0. Definitions.
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-
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- "This License" refers to version 3 of the GNU General Public License.
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- "Copyright" also means copyright-like laws that apply to other kinds of
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-works, such as semiconductor masks.
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- "The Program" refers to any copyrightable work licensed under this
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-infringement under applicable copyright law, except executing it on a
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- The Corresponding Source need not include anything that users
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-Source.
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- The Corresponding Source for a work in source code form is that
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-same work.
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- All rights granted under this License are granted for the term of
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-copyright on the Program, and are irrevocable provided the stated
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-permission to run the unmodified Program. The output from running a
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-covered work is covered by this License only if the output, given its
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-content, constitutes a covered work. This License acknowledges your
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-rights of fair use or other equivalent, as provided by copyright law.
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-in force. You may convey covered works to others for the sole purpose
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-the terms of this License in conveying all material for which you do
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-not control copyright. Those thus making or running the covered works
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-for you must do so exclusively on your behalf, under your direction
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- Conveying under any other circumstances is permitted solely under
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- it, and giving a relevant date.
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- b) The work must carry prominent notices stating that it is
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- released under this License and any conditions added under section
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- 7. This requirement modifies the requirement in section 4 to
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- "keep intact all notices".
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- c) You must license the entire work, as a whole, under this
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- License will therefore apply, along with any applicable section 7
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- invalidate such permission if you have separately received it.
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- d) If the work has interactive user interfaces, each must display
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-"aggregate" if the compilation and its resulting copyright are not
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-used to limit the access or legal rights of the compilation's users
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-beyond what the individual works permit. Inclusion of a covered work
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-parts of the aggregate.
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-
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- 6. Conveying Non-Source Forms.
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- You may convey a covered work in object code form under the terms
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-of sections 4 and 5, provided that you also convey the
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-machine-readable Corresponding Source under the terms of this License,
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- a) Convey the object code in, or embodied in, a physical product
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- Corresponding Source fixed on a durable physical medium
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- customarily used for software interchange.
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-
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- b) Convey the object code in, or embodied in, a physical product
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- written offer, valid for at least three years and valid for as
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+ This library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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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 program is distributed in the hope that it will be useful,
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+ This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- GNU General Public License for more details.
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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- You should have received a copy of the GNU General Public License
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- along with this program. If not, see <https://www.gnu.org/licenses/>.
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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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+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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+ USA
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Also add information on how to contact you by electronic and paper mail.
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- If the program does terminal interaction, make it output a short
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-notice like this when it starts in an interactive mode:
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-
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- <program> Copyright (C) <year> <name of author>
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- This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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- This is free software, and you are welcome to redistribute it
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- under certain conditions; type `show c' for details.
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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, your program's commands
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-might be different; for a GUI interface, you would use an "about box".
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-
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- You should also get your employer (if you work as a programmer) or school,
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-if any, to sign a "copyright disclaimer" for the program, if necessary.
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-For more information on this, and how to apply and follow the GNU GPL, see
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-<https://www.gnu.org/licenses/>.
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-
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- The GNU General Public License does not permit incorporating your program
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-into proprietary programs. If your program is a subroutine library, you
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-may consider it more useful to permit linking proprietary applications with
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-the library. If this is what you want to do, use the GNU Lesser General
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-Public License instead of this License. But first, please read
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-<https://www.gnu.org/licenses/why-not-lgpl.html>.
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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 library, if
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+necessary. Here is a sample; alter the names:
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+
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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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+
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+ <signature of Ty Coon>, 1 April 1990
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+ Ty Coon, President of Vice
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+
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+That's all there is to it!
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