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Software License Notice
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright © 1991, 1999 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.
[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 freedom to distribute copies of free
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are 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 translate to certain responsibilities for
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For example, if you distribute copies of the library, whether gratis or for a fee, you must give the
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We protect your rights with a two-step method: (1) we copyright the library, and (2) we offer you
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To protect each distributor, we want to make it very clear that there is no warranty for the free
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Most GNU software, including some libraries, is covered by the ordinary GNU General Public
License. This license, the GNU Lesser General Public License, applies to certain designated
libraries, and is quite different from the ordinary General Public License. We use this license for
certain libraries in order to permit linking those libraries into non-free programs.
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