We recommend this License principally for works whose purpose is instruction or reference. 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 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. It complements the GNU General Public License, which is a copyleft license designed for free software. This License is a kind of 'copyleft', which means that derivative works of the document must themselves be free in the same sense. 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. 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. YES NO 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
