User manual

4
4. Libnl, nopoll, nss-mdns, xz
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 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 rst 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 rst 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
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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 surrender these
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you distribute copies of the library or if you modify it.
For example, if you distribute copies of the library, whether gratis or
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You must make sure that they, too, receive or can get the source code.
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must show them these terms so they know their rights.
We protect your rights with a two-step method: (1) we copyright
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To protect each distributor, we want to make it very clear that there
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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
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When a program is linked with a library, whether statically or using
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entire combination ts 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
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For example, on rare occasions, there may be a special need to
encourage the widest possible use of a certain library, so that it
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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
modied version of the Library.
The precise terms and conditions for copying, distribution and
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“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
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Activities other than copying, distribution and modication are
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of running a program using the Library is not restricted, and
output from such a program is covered only if its contents
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