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<section>

    <title>Preamble</title>

    <para>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.</para>
    
    <para>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 <xref
    linkend="licenses-gfdl-chapter" />, 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>
    
</section>