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To do so, attach the following notices to the program. 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.
< one line to give the program's name and a brief idea of what it does.>
C opyright (C) <year> <name of author>
T his program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option) any
later version.
T his program 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 General Public
License for more details.
Y ou should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this when it starts
in an interactive mode:
G nomovision version 69, Copyright (C) year name of author Gnomovision
comes with ABSOLUTELY NO WARRANTY; for details type ‛show w'.
This is free software, and you are welcome to redistribute it under certain
conditions; type ‛show c' for details.
The hypothetical commands ‛show w' and ‛show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may be
called something other than ‛show w' and ‛show c'; they could even be mouse-
clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here
is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
‛Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may consider
it more useful to permit linking proprietary applications with the library. If this is
what you want to do, use the GNU Lesser General Public License instead of
this License.
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts as the
successor of the GNU Library Public License, version 2, hence the version
number 2.1.]
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 Lesser General Public License, applies to some specially
designated software packages--typically libraries--of the Free Software
Foundation and other authors who decide to use it. You can use it too, but
we suggest you first think carefully about whether this license or the ordinary
General Public License is the better strategy to use in any particular case,
based on the explanations below.
When we speak of free software, we are referring to freedom of use, not price.
Our General Public Licenses are designed to make sure that you have the
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informed that you can do these things.
To protect your rights, we need to make restrictions that forbid distributors to
deny you these rights or to ask you to surrender these rights. These restrictions
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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
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We protect your rights with a two-step method: (1) we copyright the library, and
(2) we offer you this license, which gives you legal permission to copy, distribute
and/or modify the library.
To protect each distributor, we want to make it very clear that there is no
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Finally, software patents pose a constant threat to the existence of any free
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users of a free program by obtaining a restrictive license from a patent holder.
Therefore, we insist that any patent license obtained for a version of the library
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Most GNU software, including some libraries, is covered by the ordinary GNU
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When a program is linked with a library, whether statically or using a shared library,
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only if the entire combination fits its criteria of freedom. The Lesser General Public
License permits more lax criteria for linking other code with the library.
We call this license the "Lesser" General Public License because it does Less
to protect the user's freedom than the ordinary General Public License. It also
provides other free software developers Less of an advantage over competing
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General Public License for many libraries. However, the Lesser license provides
advantages in certain special circumstances.
For example, on rare occasions, there may be a special need to encourage the
widest possible use of a certain library, so that it becomes a de-facto standard.
To achieve this, non-free programs must be allowed to use the library. A more
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In other cases, permission to use a particular library in non-free programs
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example, permission to use the GNU C Library in non-free programs enables
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variant, the GNU/Linux operating system.
Although the Lesser General Public License is Less protective of the users'
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has the freedom and the wherewithal to run that program using a modified
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The precise terms and conditions for copying, distribution and modification follow.
Pay close attention to the difference between a "work based on the library" and
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GNU LESSER GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR
COPYING, DISTRIBUTION AND MODIFICATION
0. T his License Agreement applies to any software library or other program
which contains a notice placed by the copyright holder or other authorized
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