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按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

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.