The purpose of this License is to make a manual, textbook, or other functional and
useful document "free" in the sense of freedom: to assure everyone the effective
freedom to copy and redistribute it, with or without modifying it, either commercially
or noncommercially. Secondarily, this License preserves for the author and publisher
a way to get credit for their work, while not being considered responsible for
modifications made by others.
This License is a kind of "copyleft", which means that derivative works of the
document must themselves be free in the same sense. It complements the GNU General
Public License, which is a copyleft license designed for free software.
We have designed this License in order to use it for manuals for free software,
because free software needs free documentation: a free program should come with
manuals providing the same freedoms that the software does. But this License is
not limited to software manuals; it can be used for any textual work, regardless
of subject matter or whether it is published as a printed book. We recommend this
License principally for works whose purpose is instruction or reference.
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