ZyXEL Communications ZYWALL USG 20 Manual page 908

Appendix E Open Software Announcements
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 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 say, a work containing the Library or a portion of it, either
verbatim or with modifications and/or translated straightforwardly into another
language. (Hereinafter, 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
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ZyWALL USG 20/20W User's Guide