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User manual (user manual) (ver.1.0) (korean)
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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
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.
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 which has been distributed under these terms.
A "work based on the Library" means either the Library
or any derivative work under copyright law: that is to
10
say, a work containing the Library or a portion of it,
either verbatim or with modifications and/or translated
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translation is included without limitation in the term
"modification".)
"Source code" for a work means the preferred form of the
work for making modifications to it. For a library, complete
source code means all the source code for all modules it
contains, plus any associated interface definition files, plus
the scripts used to control compilation and installation of
the library.
Activities other than copying, distribution and modification
are not covered by this License; they are outside its
scope. The act of running a program using the Library is
not restricted, and output from such a program is covered
only if its contents constitute a work based on the Library
(independent of the use of the Library in a tool for writing
it). Whether that is true depends on what the Library does
and what the program that uses the Library does.
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 appropriate
copyright notice and disclaimer of warranty; keep intact all
the notices that refer to this License and to the absence of
any warranty; and distribute a copy of this License along
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You may charge a fee for the physical act of transferring
a copy, and you may at your option offer warranty
protection in exchange for a fee.
2. You may modify your copy or copies of the Library
or any portion of it, thus forming a work based on the
Library, and copy and distribute such modifications or
work under the terms of Section 1 above, provided that
you also meet all of these conditions:
a) The modified work must itself be a software library.
b) You must cause the files modified to carry
prominent notices stating that you changed the
files and the date of any change.
c) You must cause the whole of the work to be
licensed at no charge to all third parties under the
terms of this License.
d) If a facility in the modified Library refers to a
function or a table of data to be supplied by an
application program that uses the facility, other
than as an argument passed when the facility is
invoked, then you must make a good faith effort
to ensure that, in the event an application does
not supply such function or table, the facility
still operates, and performs whatever part of its
purpose remains meaningful.
(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-
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must be optional: if the application does not
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These requirements apply to the modified work as a
whole. If identifiable sections of that work are not

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