PREAMBLE The purpose of this License is to
make a manual, textbook, or other written 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.
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