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E veryone 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 m ost 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 F oundation and other authors who decide to use it. Y ou 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
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To protect your rights, we need to make restrictions that forbid distributors to deny you these rights or to ask you to
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F or exam ple, if you distribute copies of the library, whether gratis or for a fee, you must give the recipients all the rights that
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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
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To protect each distributor, we want to make it very clear that there is no warranty for the free library. Also, if the library is
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the original author's reputation will not be affected by problems that might be introduced by others.
F inally, software patents pose a constant threat to the existence of any free program . We wish to make sure that a company
cannot effectively restrict the 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 must be consistent with the full freedom of use specified in
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Most GNU software, including som e libraries, is covered by the ordinary GNU General P ublic License. This license, the GNU
Lesser General Public License, applies to certain designated libraries, and is quite different from the ordinary General P ublic
License. We use this license for certain libraries in order to permit linking those libraries into non- free programs.
When a program is linked with a library, whether statically or using a shared library, the com bination of the two is legally
speaking a combined work, a derivative of the original library. The ordinary General Public License therefore permits such
linking 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 P ublic License. It also provides other free software developers Less of an advantage over competing non- free
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Lesser license provides advantages in certain special circumstances.
F or exam ple, on rare occasions, there may be a special need to encourage the widest possible use of a certain library, so that
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is that a free library does the same job as widely used non- free libraries. In this case, there is little to gain by limiting the
free library to free software only, so we use the Lesser General Public License.
In other cases, permission to use a particular library in non- free program s enables a greater num ber of people to use a large
body of free software. F or exam ple, permission to use the GNU C Library in non- free programs enables m any more people to
use the whole GNU operating system, as well as its variant, the GNU/ Linux operating system.
Although the Lesser General Public License is Less protective of the users' freedom , it does ensure that the user of a program
that is linked with the Library has the freedom and the wherewithal to run that program using a modified version of the
Library.
The precise terms and conditions for copying, distribution and modification follow. Pay close attention to the difference
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