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Appendix A
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 difference between
a "work based on the library" and a "work that uses the library". The
former contains code derived from the library, whereas the latter
must be combined with the library in order to run.
GNU LESSER GENERAL PUBLIC LICENSE
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 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
(which use some of those functions and data) to form executables.
The "Library", below, refers to any such software library or work
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Activities other than copying, distribution and modification are not
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based on the Library (independent of the use of the Library in a tool
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1. You may copy and distribute verbatim copies of the Library's
complete source code as you receive it, in any medium, provided
that you conspicuously and appropriately publish on each copy an
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warranty; and distribute a copy of this License along with the
Library.
You may charge a fee for the physical act of transferring a copy,
and you may at your option offer warranty protection in exchange
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c) You must cause the whole of the work to be licensed at no charge
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d) If a facility in the modified Library refers to a function or a table
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(For example, a function in a library to compute square roots has a
purpose that is entirely well-defined independent of the application.
Therefore, Subsection 2d requires that any application-supplied
function or table used by this function must be optional: if the
application does not supply it, the square root function must still
compute square roots.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Library,
and can be reasonably considered independent and separate works
in themselves, then this License, and its terms, do not apply to
those sections when you distribute them as separate works. But
when you distribute the same sections as part of a whole which is a
work based on the Library, the distribution of the whole must be on
the terms of this License, whose permissions for other licensees
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Thus, it is not the intent of this section to claim rights or contest
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In addition, mere aggregation of another work not based on the
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To do this, you must alter all the notices that refer to this License,
so that they refer to the ordinary GNU General Public License,
version 2, instead of to this License. (If a newer version than
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Once this change is made in a given copy, it is irreversible for that
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This option is useful when you wish to copy part of the code of the
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