Cairo is free software.
Every source file in the implementation[*] of cairo is available to be
redistributed and/or modified under the terms of either the GNU Lesser
General Public License (LGPL) version 2.1 or the Mozilla Public
License (MPL) version 1.1. Some files are available under more
liberal terms, but we believe that in all cases, each file may be used
under either the LGPL or the MPL.
See the following files in this directory for the precise terms and
conditions of either license:
COPYING-LGPL-2.1
COPYING-MPL-1.1
Please see each file in the implementation for copyright and licensing
information, (in the opening comment of each file).
[*] The implementation of cairo is contained entirely within the "src"
directory of the cairo source distribution. There are other components
of the cairo source distribution (such as the "test", "util", and "perf")
that are auxiliary to the library itself. None of the source code in these
directories contributes to a build of the cairo library itself, (libcairo.so
or cairo.dll or similar).
These auxiliary components are also free software, but may be under
different license terms than cairo itself. For example, most of the
test cases in the perf and test directories are made available under
an MIT license to simplify any use of this code for reference purposes
in using cairo itself. Other files might be available under the GNU
General Public License (GPL), for example. Again, please see the COPYING
file under each directory and the opening comment of each file for copyright
and licensing information.