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Markdown
# GNU LIBRARY GENERAL PUBLIC LICENSE
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Version 2, June 1991
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Copyright (C) 1991 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 library GPL. It is
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numbered 2 because it goes with version 2 of the ordinary GPL.]
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## Preamble
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The licenses for most software are designed to take away your freedom
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to share and change it. By contrast, the GNU General Public Licenses
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are 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.
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This license, the Library General Public License, applies to some
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specially designated Free Software Foundation software, and to any
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other libraries whose authors decide to use it. You can use it for
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your libraries, too.
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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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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
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you distribute copies of the library, or if you modify it.
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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 a program 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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Our method of protecting your rights has two steps: (1) copyright the
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library, and (2) 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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Also, for each distributor's protection, we want to make certain that
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everyone understands that there is no warranty for this free library.
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If the library is modified by someone else and passed on, we want its
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recipients to know that what they have is not the original version, so
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that any problems introduced by others will not reflect on the
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original authors' reputations.
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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 companies distributing free
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software will individually obtain patent licenses, thus in effect
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transforming the program into proprietary software. To prevent this,
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we have made it clear that any patent must be licensed for everyone's
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free use or not licensed at all.
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Most GNU software, including some libraries, is covered by the
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ordinary GNU General Public License, which was designed for utility
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programs. This license, the GNU Library General Public License,
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applies to certain designated libraries. This license is quite
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different from the ordinary one; be sure to read it in full, and don't
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assume that anything in it is the same as in the ordinary license.
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The reason we have a separate public license for some libraries is
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that they blur the distinction we usually make between modifying or
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adding to a program and simply using it. Linking a program with a
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library, without changing the library, is in some sense simply using
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the library, and is analogous to running a utility program or
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application program. However, in a textual and legal sense, the linked
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executable is a combined work, a derivative of the original library,
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and the ordinary General Public License treats it as such.
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Because of this blurred distinction, using the ordinary General Public
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License for libraries did not effectively promote software sharing,
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because most developers did not use the libraries. We concluded that
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weaker conditions might promote sharing better.
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However, unrestricted linking of non-free programs would deprive the
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users of those programs of all benefit from the free status of the
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libraries themselves. This Library General Public License is intended
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to permit developers of non-free programs to use free libraries, while
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preserving your freedom as a user of such programs to change the free
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libraries that are incorporated in them. (We have not seen how to
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achieve this as regards changes in header files, but we have achieved
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it as regards changes in the actual functions of the Library.) The
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hope is that this will lead to faster development of free libraries.
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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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"work based on the library" and a "work that uses the library". The
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former contains code derived from the library, while the latter only
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works together with the library.
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Note that it is possible for a library to be covered by the ordinary
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General Public License rather than by this special one.
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## TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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A "library" means a collection of software functions and/or data
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The "Library", below, refers to any such software library or work
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(For example, a function in a library to compute square roots has
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Thus, it is not the intent of this section to claim rights or contest
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When a "work that uses the Library" uses material from a header file
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