78 Appendix
Appendix
7
conditions; type `show c’
The hypothetical commands `show w’
`show c’
of the General Public License. Of course,
the commands you use may be called
something other than `show w’
c’; they could even be mouse
items--whatever suits your prog
Y
work as a programmer) or your school, if
any
program, if necessary. Here is a sample; alter
the names:
Y
copyright interest in the program
`Gnomovision
compilers) written by James Hacker.
<signature of
Ty Coon, P
This General Public License does not permit
incorporating your program into proprietary
programs. If your prog
library, you may consider it more useful to
permit linking proprietar
the library. If this is what you want to do,
use the GNU Lesser General Public License
instead of this License.
GNU LESSER
GENERAL PUBLIC
LICENSE
Version 2.1, F
Copyright (C) 1991, 1999 Free Software
Foundation, Inc.
51 Franklin Street, F
02110-1301 USA
Everyone is permitted to copy and distribute
verbatim copies of this license document,
but changing it is not allowed.
[
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 shar
change it. By contrast, the GNU General
Public Licenses are intended to guarant
your freedom to share and change fr
software--to make sure the soft
for all its users.
This license, the Lesser General P
License,
software packages--t
the Free Software F
authors who decide to use it.
too, but we suggest you rst think car
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
General Public Licenses are designed to
make sure that you have the freedom to
distribute copies of free software (and
charge for this service if you wish); that you
receive source code or can get it if you want
it; that you can change the software and
use pieces of it in new free programs; and
that you are informed that you can do these
things.
T
restrictions that forbid distributors to deny
you these rights or to ask you to surrender
these rights.
to certain responsibilities for you if you
distribute copies of the library or if you
modify it.
For example
library, whether gratis or for a f
give the recipients all the rights that we
gave you.
too, receiv
you link other code with the library, you
must provide complete object les to the
recipients, so that they can relink them with
the library after mak
library and recompiling it. And you must
show them these terms so they know their
rights.
We prot
method: (1) we copyright the library, and (2)
we oer you this license, which g
legal permission to copy, distribute and/or
modify the library.
T
it very clear that there is no warranty for the
free library. Also, if the library is modied by
someone else and passed on, the recipients
should know that what they have is not the
original version, so that the original author’s
reputation will not be aected by problems
that might be introduced by others.
Finally
threat to the existence of any fr
We wish to make sure that a compan
cannot eectively restrict the users of a
free program by obtaining a r
license from a patent holder
insist that any patent license obtained for
a version of the library must be consistent
with the full freedom of use specied in this
license.
Most GNU software, including some libraries,
is covered by the ordinary GNU General
Public License.
General Public License, applies to certain
designated libraries, and is quite dier
from the ordinary General Public License.
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
the original library.
Public License theref
only if the entire combination ts its criteria
of freedom.
License permits more lax criteria for linking
other code with the library.
We call this license the
Public License because it does Less to
protect the user’s freedom than the or
General Public License. It also provides
other free software developers Less of
an advantage over competing non-free
programs.
reason we use the ordinary General Public
License for many libraries. Howev
Lesser license pr
special circumstances.
For example
be a special need to encourage the widest
possible use of a certain librar
becomes a de-facto standard. T
this, non-free programs must be allo
use the library. A more fr
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 L
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. F
permission to use the GNU C Library in non-
free programs enables many mor
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
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 modied version of the Library.
The precise terms and conditions for
copying, distribution and modication
follow
between a
a
contains code derived from the library,
whereas the latter must be combined with
the library in order to run.
TERMS AND CONDITIONS FOR
COP
MODIFICA
0. This License Agr
any software library or other program
which contains a notice placed by the
copyright holder or other authorized
party saying it may be distributed
the terms of this Lesser General Public
License (also called
licensee is addressed as
A
functions and/or data prepared so as to
be conveniently linked with application
programs (which use some of those
functions and
The
software library or work which has been
distributed under these terms. A
based on the Library
Library or any derivative work under
copyright law: that is to say, a work
containing the Library or a por
either verbatim or with modications
HB985_USA_Open Source_ENG.indd 78 2011-09-27 �� 5:11:51
