1. GPL许可证
文件中的关键字：
（1）This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
版本：3.0及以后
（2）This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.
版本：2.0及以后
（3）.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
版本：2.0及以后
2. LGPL许可证
文件中的关键字：
（1）The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
版本：2.1及以后
3. ISC许可证
文件中的关键字：
SPDX-License-Identifier: ISC
版本：无
4. Old MIT许可证
文件中的关键字：
HarfBuzz is licensed under the so-called "Old MIT" license.
版本：无
5. Apache许可证
文件中的关键字：
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
版本：2.0
6. FDL许可证
文件中的关键字：
（1）@c The GNU Free Documentation License.
@center Version 1.3, 3 November 2008
版本：1.3
（2）Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation
版本：1.3
7. LIBRARY GPL许可证
文件中的关键字：
GNU LIBRARY GENERAL PUBLIC LICENSE Version 2, June 1991
版本：2
8. Academic Free License许可证
文件中的关键字：
Licensed under the Academic Free License version 2.1
版本：2.1