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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
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The "Library", below, refers to any such software library or work which has been distributed under these terms. A "work based
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(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
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Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of
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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
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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
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In addition, mere aggregation of another work not based on the Library with the Library (or with a work based on the Library)
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LIBPNG REFERENCE LIBRARY

2009-12-17

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