Blame Manuals/Docbook/Licenses/Gfdl/section-1.docbook
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<section>
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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 ``free'' in the sense of
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freedom: to assure everyone the effective freedom to copy and
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redistribute it, with or without modifying it, either commercially
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or noncommercially. Secondarily, this License preserves for the
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author and publisher a way to get credit for their work, while not
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being considered responsible for modifications made by
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others.</para>
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<para>This License is a kind of ``copyleft'', which means that
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derivative works of the document must themselves be free in the
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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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