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The perceptualdiff program was written by Hector Yee with contributions from Scott Corley and Mick Weiss. It is hosted at http://pdiff.sourceforge.net The source code added here was obtained by: svn co https://svn.sourceforge.net/svnroot/pdiff/trunk pdiff which gave revision 22 of the source code. The perceptualdiff program is available under the terms of the GNU GPL, so I've added a note to COPYING about this program, (and the fact that it is auxiliary only, and does not affect the license of the implementation of cairo itself).
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32 lines
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Cairo is free software.
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Every source file in the implementation[*] of cairo is available to be
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redistributed and/or modified under the terms of either the GNU Lesser
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General Public License (LGPL) version 2.1 or the Mozilla Public
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License (MPL) version 1.1. Some files are available under more
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liberal terms, but we believe that in all cases, each file may be used
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under either the LGPL or the MPL.
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See the following files in this directory for the precise terms and
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conditions of either license:
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COPYING-LGPL-2.1
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COPYING-MPL-1.1
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Please see each file in the implementation for copyright and licensing
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information, (in the opening comment of each file).
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[*] The implementation of cairo is contained entirely within the "src"
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and "pixman" directories of the cairo source distribution. There are
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other components of the cairo source distribution (such as the "test"
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and "perf") that are auxiliary to the library itself. None of the
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source code in these directories contributes to a build of the cairo
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library itself, (libcairo.so or cairo.dll or similar).
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These auxilary components are also free software, but may be under
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different license terms than cairo itself. For example, most of the
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test cases in the perf and test directories are made available under
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an MIT license to simplify any use of this code for reference purposes
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in using cairo itself. Other files might be available under the GNU
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General Public License (GPL), for example. Again, please see the
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opening comment of each file for copyright and licensing information.
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