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<section id="licenses-gfdl-section-1" xreflabel="Preamble">
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<title>Preamble</title>
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<para>The purpose of this License is to make a manual, textbook,
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or other functional and useful document <quote>free</quote> in the
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sense of freedom: to assure everyone the effective freedom to copy
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and redistribute it, with or without modifying it, either
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commercially or noncommercially. Secondarily, this License
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preserves for the author and publisher a way to get credit for
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their work, while not being considered responsible for
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modifications made by others.</para>
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<para>This License is a kind of <quote>copyleft</quote>, which
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means that derivative works of the document must themselves be
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free in the same sense. It complements the
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linkend="licenses-gfdl-chapter" />, which is a copyleft license
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designed for free software.</para>
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<para>We have designed this License in order to use it for manuals
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for free software, because free software needs free documentation:
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a free program should come with manuals providing the same
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freedoms that the software does. But this License is not limited
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to software manuals; it can be used for any textual work,
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regardless of subject matter or whether it is published as a
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printed book. We recommend this License principally for works
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whose purpose is instruction or reference.</para>
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</section>
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