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333 lines
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# APPENDIX F - License Agreement
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```nohighlight
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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 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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Preamble
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The licenses for most software are designed to take away your freedom to share and
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change it. By contrast, the GNU General Public Licenses are intended to guarantee
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your freedom to share and change free software--to make sure the software is free
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for all
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its users.
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This license, the Lesser General Public License, applies to some specially designated
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software packages--typically libraries--of the Free Software Foundation and other
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authors who decide to use it. You can use it too, but we suggest you first think
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carefully about whether this license or the ordinary General Public License is the
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better 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, not price. Our
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General Public Licenses are designed to make sure that you have the freedom to
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distribute copies of free software (and charge for this service if you wish); that
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you receive source code or can get it if you want it; that you can change the
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software and use pieces of it in new free programs; and that you are informed that
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you can do these things.
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To protect your rights, we need to make restrictions that forbid distributors to deny
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you these rights or to ask you to surrender these rights. These restrictions
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translate to certain responsibilities for you if you distribute copies of the library
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or if you modify it.
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For example, if you distribute copies of the library, whether gratis or for a fee,
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you must give the recipients all the rights that we gave you. You must make sure that
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they, too, receive or can get the source code. If you link other code with the
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library, you must provide complete object files to the recipients, so that they can
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relink them with the library after making changes to the library and recompiling it.
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And you must show them these terms so they know their rights.
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We protect your rights with a two-step method: (1) we copyright the library, and (2)
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we offer you this license, which gives you legal permission to copy, distribute
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and/or modify the library.
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To protect each distributor, we want to make it very clear that there is no warranty
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for the free library. Also, if the library is modified by someone else and passed
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on, the recipients should know that what they have is not the original version, so
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that the original 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 any free
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program. We wish to make sure that a company cannot effectively restrict the users
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of a free program by obtaining a restrictive license from a patent holder.
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Therefore, we insist that any patent license obtained for a version of the library
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must be 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 ordinary GNU General
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Public License. This license, the GNU Lesser General Public License, applies to
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certain designated libraries, and is quite different from the ordinary General
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Public License. We use this license for certain libraries in order to permit linking
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those libraries into non-free programs.
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When a program is linked with a library, whether statically or using a shared
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library, the combination of the two is legally speaking a combined work, a
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derivative of the original library. The ordinary General Public License therefore
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permits such linking only if the entire combination fits its criteria of freedom.
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The Lesser General Public License permits more lax criteria for linking other code
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with the library.
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We call this license the "Lesser" General Public License because it does Less to
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protect the user's freedom than the ordinary General Public License. It also provides
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other free software developers Less of an advantage over competing non-free programs.
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These disadvantages are the reason we use the ordinary General Public License for
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many libraries. However, the Lesser license provides advantages in certain special
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circumstances.
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For example, on rare occasions, there may be a special need to encourage the widest
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possible use of a certain library, so that it becomes a de-facto standard. To
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achieve this, non-free programs must be allowed to use the library. A more frequent
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case is that a free library does the same job as widely used non-free libraries. In
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this case, there is little to gain by limiting the free library to free software only,
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so we use the Lesser General Public License.
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In other cases, permission to use a particular library in non-free programs enables
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a greater number of people to use a large body of free software. For example,
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permission to use the GNU C Library in non-free programs enables many more people to
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use the whole GNU operating system, as well as its variant, the GNU/Linux operating
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system.
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Although the Lesser General Public License is Less protective of the users' freedom,
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it does ensure that the user of a program that is linked with the Library has the
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freedom and the wherewithal to run that program using a modified version of the
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Library.
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The precise terms and conditions for copying, distribution and modification follow.
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Pay close attention to the difference between a "work based on the library" and a
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"work that uses the library". The former contains code derived from the library,
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whereas the latter must be combined with the library in order to run.
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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 program which
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contains a notice placed by the copyright holder or other authorized party saying it
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may be distributed under the terms of this Lesser General Public License (also called
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"this License"). Each licensee is addressed as "you".
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A "library" means a collection of software functions and/or data prepared so as to be
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conveniently linked with application programs (which use some of those functions and
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The "Library", below, refers to any such software library or work which has been
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distributed under these terms. A "work based on the Library" means either the Library
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or any derivative work under copyright law: that is to say, a work containing the
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Library or a portion of it, either verbatim or with modifications and/or translated
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straightforwardly into another language. (Hereinafter, translation is included without
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limitation in the term "modification".)
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"Source code" for a work means the preferred form of the work for making modifications
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to it. For a library, complete source code means all the source code for all modules
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it contains, plus any associated interface definition files, plus the scripts used to
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control compilation and installation of the library.
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Activities other than copying, distribution and modification are not covered by this
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License; they are outside its scope. The act of running a program using the Library
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is not restricted, and output from such a program is covered only if its contents
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constitute a work based on the Library (independent of the use of the Library in a
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the program that uses the Library does.
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1. You may copy and distribute verbatim copies of the Library's complete source code
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as you receive it, in any medium, provided that you conspicuously and appropriately
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You may charge a fee for the physical act of transferring a copy, and you may at your
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whatever part of its purpose remains meaningful. (For example, a function
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in a library to compute square roots has a purpose that is entirely
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well-defined independent of the application. Therefore, Subsection 2d
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requires that any application-supplied function or table used by this
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function must 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 identifiable sections of
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that work are not derived from the Library, and can be reasonably considered independent
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and separate works in themselves, then this License, and its terms, do not apply to those
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Thus, it is not the intent of this section to claim rights or contest your rights to work
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In addition, mere aggregation of another work not based on the Library with the Library
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3. You may opt to apply the terms of the ordinary GNU General Public License instead
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This option is useful when you wish to copy part of the code of the Library into a
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13. The Free Software Foundation may publish revised and/or new versions of the Lesser
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NO WARRANTY
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15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE LIBRARY,
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TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
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END OF TERMS AND CONDITIONS
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```
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