[cfd] / lgpl.tex

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\gpltoplevel{The GNU Library General Public License}

The following is the text of the GNU Library General Public License, under
the terms of which this software is distrubuted.

\vspace{12pt}

\begin{center}
\textbf{GNU LIBRARY GENERAL PUBLIC LICENSE} \\
Version 2, June 1991
\end{center}

\begin{center}
Copyright \copyright\ 1989, 1991 Free Software Foundation, Inc. \\
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

Everyone is permitted to copy and distribute verbatim copies \\
of this license document, but changing it is not allowed.
\end{center}


\gplsec{Preamble}

The licenses for most software are designed to take away your freedom to
share and change it.  By contrast, the GNU General Public Licenses are
intended to guarantee your freedom to share and change free software--to make
sure the software is free for all its users.

This license, the Library General Public License, applies to some specially
designated Free Software Foundation software, and to any other libraries
whose authors decide to use it.  You can use it for your libraries, too.

When we speak of free software, we are referring to freedom, not price.  Our
General Public Licenses are designed to make sure that you have the freedom
to distribute copies of free software (and charge for this service if you
wish), that you receive source code or can get it if you want it, that you
can change the software or use pieces of it in new free programs; and that
you know you can do these things.

To protect your rights, we need to make restrictions that forbid anyone to
deny you these rights or to ask you to surrender the rights.  These
restrictions translate to certain responsibilities for you if you distribute
copies of the library, or if you modify it.

For example, if you distribute copies of the library, whether gratis or for a
fee, you must give the recipients all the rights that we gave you.  You must
make sure that they, too, receive or can get the source code.  If you link a
program with the library, you must provide complete object files to the
recipients so that they can relink them with the library, after making
changes to the library and recompiling it.  And you must show them these
terms so they know their rights.

Our method of protecting your rights has two steps: (1) copyright the
library, and (2) offer you this license which gives you legal permission to
copy, distribute and/or modify the library.

Also, for each distributor's protection, we want to make certain that
everyone understands that there is no warranty for this free library.  If the
library is modified by someone else and passed on, we want its recipients to
know that what they have is not the original version, so that any problems
introduced by others will not reflect on the original authors' reputations.

Finally, any free program is threatened constantly by software patents.  We
wish to avoid the danger that companies distributing free software will
individually obtain patent licenses, thus in effect transforming the program
into proprietary software.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

Most GNU software, including some libraries, is covered by the ordinary GNU
General Public License, which was designed for utility programs.  This
license, the GNU Library General Public License, applies to certain
designated libraries.  This license is quite different from the ordinary one;
be sure to read it in full, and don't assume that anything in it is the same
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The reason we have a separate public license for some libraries is that they
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legal sense, the linked executable is a combined work, a derivative of the
original library, and the ordinary General Public License treats it as such.

Because of this blurred distinction, using the ordinary General Public
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most developers did not use the libraries.  We concluded that weaker
conditions might promote sharing better.

However, unrestricted linking of non-free programs would deprive the users of
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incorporated in them.  (We have not seen how to achieve this as regards
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development of free libraries.

The precise terms and conditions for copying, distribution and modification
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derived from the library, while the latter only works together with the
library.

Note that it is possible for a library to be covered by the ordinary General
Public License rather than by this special one.


\gplsec{Terms and conditions for copying, distribution and modification}

\begin{enumerate}

\makeatletter \setcounter{\@listctr}{-1} \makeatother

\item [0.] This License Agreement applies to any software library which
      contains a notice placed by the copyright holder or other authorized
      party saying it may be distributed under the terms of this Library
      General Public License (also called ``this License'').  Each licensee
      is addressed as ``you''.

      A ``library'' means a collection of software functions and/or data
      prepared so as to be conveniently linked with application programs
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      The ``Library'', below, refers to any such software library or work
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      ``Source code'' for a work means the preferred form of the work for
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      Activities other than copying, distribution and modification are not
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      on the Library (independent of the use of the Library in a tool for
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      what the program that uses the Library does.
  
\item [1.] You may copy and distribute verbatim copies of the Library's
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      notices that refer to this License and to the absence of any warranty;
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      You may charge a fee for the physical act of transferring a copy, and
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\item [2.] You may modify your copy or copies of the Library or any portion
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      \begin{enumerate}

      \item [(a)] The modified work must itself be a software library.

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            (For example, a function in a library to compute square roots has
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      However, linking a ``work that uses the Library'' with the Library
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\item [7.] You may place library facilities that are a work based on the
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      \begin{enumerate}

      \item [(a)] Accompany the combined library with a copy of the same work
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      \end{enumerate}

\item [8.] You may not copy, modify, sublicense, link with, or distribute
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\item [12.] If the distribution and/or use of the Library is restricted in
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\item [13.] The Free Software Foundation may publish revised and/or new
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\item [14.] If you wish to incorporate parts of the Library into other free
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\begin{center}
NO WARRANTY
\end{center}

\bfseries

\item [15.] Because the Library is licensed free of charge, there is no
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\item [16.] In no event unless required by applicable law or agreed to in
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\end{enumerate}

\begin{center}
\textbf{END OF TERMS AND CONDITIONS}
\end{center}


\gplsec{Appendix: How to apply these terms to your new libraries}

If you develop a new library, and you want it to be of the greatest possible
use to the public, we recommend making it free software that everyone can
redistribute and change.  You can do so by permitting redistribution under
these terms (or, alternatively, under the terms of the ordinary General
Public License).

To apply these terms, attach the following notices to the library.  It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
``copyright'' line and a pointer to where the full notice is found.

\begin{verbatim}
<one line to give the library's name and a brief idea of what it does.>
Copyright (C) <year>  <name of author>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
\end{verbatim}

Also add information on how to contact you by electronic and paper mail.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a ``copyright disclaimer'' for the library, if
necessary.  Here is a sample; alter the names:

\begin{verbatim}
Yoyodyne, Inc., hereby disclaims all copyright interest in the
library `Frob' (a library for tweaking knobs) written by James
Random Hacker.

<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
\end{verbatim}

That's all there is to it!

\gplend