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recipients should know that what they have is not the
original version, so that the original author's reputation
will not be affected by problems that might be introduced
by others.
Finally, 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 this license.
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.
When a program is linked with a library, whether
statically or using a shared library, the combination 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 Public License. It also provides other
free software developers Less of an advantage over
competing non-free programs. These disadvantages are
the reason we use the ordinary 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 frequent case 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 programs enables a greater number of people to
use a large body of free software. For example, permission
to use the GNU C Library in non-free programs enables
many 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
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94
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TERMS AND CONDITIONS FOR
COPYING, DISTRIBUTION AND
MODIFICATION
0. This License Agreement applies to any software library
or other program which contains a notice placed by the
copyright holder or other authorized party saying it
may be distributed under the terms of this Lesser
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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
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The "Library", below, refers to any such software library
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work for making modifications to it. For a library,
complete source code means all the source code for all
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Activities other than copying, distribution and
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Library does and what the program that uses the Library
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1. You may copy and distribute verbatim copies of the
Library's complete source code as you receive it, in
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