gnu_free_documentation_license

1.A copy of the license is included in the section entitled "GNU Free Documentation license".
完整的许可证文本包括在GNU自由文档许可证中。
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2.This is an unofficial translation of the GNU Free Documentation License (GFDL) into Chinese.
这是GNU 自由文档协议的非官方中文翻译。
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3.I released the book under the GNU Free Documentation License, which allows users to copy, modify, and distribute the book.
之后我就以GNU自由文档协议来发布了这本书，这一协议允许所有人去复制、修改以及分发这本书。
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