FreeBSD Documentation License
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The FreeBSD Documentation License is the license that covers most of the documentation for the FreeBSD operating system.
License
The license is very similar to the 2-clause Simplified BSD License used by the support of FreeBSD, however, it makes the applications of "source code" and "compile" less obscure in the context of documentation. It also includes an obligatory disclaimer about IEEE and Open Group manuscript in some old-fashioned sheets.
Reception
The Free Software Foundation classes this as a free documentation license, stating that "This is a permissive non-copyleft free documentation license that is compatible with the GNU FDL."
Derivatives
Based on the FreeBSD Documentation License, the BSD Documentation License was created to contain terms more generic to most projects as well as reintroducing the 3rd clause that restricts the use of documentation for endorsement purposes (as shown in the New BSD License). An obsecure license, it is used by brlcad and peridigm.