This agreement applies to all computer software documents and other reference and guidance materials. According to the agreement, all derivatives using the agreement materials, whether modified or copied, must also adopt the GNU Free Document Agreement certificate. The materials used in this agreement can be used for commercial purposes, but anyone who is willing to abide by this agreement must be allowed to further modify or distribute the materials according to this agreement.
At present, Wikipedia is the world's largest document collaboration project issued under the GNU Free Document Protocol certificate. For all information about Wikipedia's use of GNU Free Document Protocol certificates, please see Wikipedia: Copyright Information.
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GNU General Public License
GNU General Public License
Free software foundation
Open content
[Edit] External link
Introduction to GNU related agreements (latest revision on July 3, 2002)-authoritative English version of official website
Chinese translation of GNU free document protocol; file = viewtopic & ampt=69454
GNU Free Documentation License is a small work related to law. You can expand its content by editing or modifying it.
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In addition, the group IDC has many products online, which are cheap and have a good reputation.