<?xml version="1.0"?>
<sect1 id="licenses-gfdl-section-1" xreflabel="Preamble">

    <title>Preamble</title>

    <para>The purpose of this License is to make a manual, textbook,
    or other functional and useful document <quote>free</quote> 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.</para>
    
    <para>This License is a kind of <quote>copyleft</quote>, which
    means that derivative works of the document must themselves be
    free in the same sense.  It complements the <xref
    linkend="licenses-gfdl" />, which is a copyleft license
    designed for free software.</para>
    
    <para>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.</para>
    
</sect1>