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Verizon - WSE.book Page 41 Tuesday, February 9, 2010 12:25 PM
rights that we gave you. You must make sure that they, too,
libraries in order to permit linking those libraries into non-free
receive or can get the source code. If you link other code with the
programs. When a program is linked with a library, whether
library, you must provide complete object files to the recipients,
statically or using a shared library, the combination of the two is
so that they can relink them with the library after making
legally speaking a combined work, a derivative of the original
changes to the library and recompiling it. And you must show
library. The ordinary General Public License therefore permits
them these terms so they know their rights.
such linking only if the entire combination fits its criteria of
We protect your rights with a two-step method: (1) we copyright
freedom. The Lesser General Public License permits more lax
the library, and (2) we offer you this license, which gives you
criteria for linking other code with the library.
legal permission to copy, distribute and/or modify the library. To
We call this license the “Lesser” General Public License because
protect each distributor, we want to make it very clear that there
it does Less to protect the user's freedom than the ordinary
is no warranty for the free library. Also, if the library is modified
General Public License. It also provides other free software
by someone else and passed on, the recipients should know that
developers Less of an advantage over competing non-free
what they have is not the original version, so that the original
programs. These disadvantages are the reason we use the
author's reputation will not be affected by problems that might
ordinary General Public License for many libraries. However, the
be introduced by others. Finally, software patents pose a
Lesser license provides advantages in certain special
constant threat to the existence of any free program. We wish to
circumstances. For example, on rare occasions, there may be a
make sure that a company cannot effectively restrict the users of
special need to encourage the widest possible use of a certain
a free program by obtaining a restrictive license from a patent
library, so that it becomes a de-facto standard. To achieve this,
holder. Therefore, we insist that any patent license obtained for a
non-free programs must be allowed to use the library. A more
version of the library must be consistent with the full freedom of
frequent case is that a free library does the same job as widely
use specified in this license. Most GNU software, including some
used non-free libraries. In this case, there is little to gain by
libraries, is covered by the ordinary GNU General Public License.
limiting the free library to free software only, so we use the
This license, the GNU Lesser General Public License, applies to
Lesser General Public License.
certain designated libraries, and is quite different from the
In other cases, permission to use a particular library in non-free
ordinary General Public License. We use this license for certain
programs enables a greater number of people to use a large body
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