fft_specification.sgml

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      the name of the publisher of the Modified Version, as the
      publisher.</para>
      </listitem>

      <listitem><para>Preserve all the
      copyright notices of the Document.</para>
      </listitem>

      <listitem><para>Add an appropriate
      copyright notice for your modifications adjacent to the other
      copyright notices.</para>
      </listitem>

      <listitem><para>Include, immediately
      after the copyright notices, a license notice giving the public
      permission to use the Modified Version under the terms of this
      License, in the form shown in the Addendum below.</para>
      </listitem>

      <listitem><para>Preserve in that license
      notice the full lists of Invariant Sections and required Cover
      Texts given in the Document's license notice.</para>
      </listitem>

      <listitem><para>Include an unaltered
      copy of this License.</para>
      </listitem>

      <listitem><para>Preserve the section
      entitled "History", and its title, and add to it an item stating
      at least the title, year, new authors, and publisher of the
      Modified Version as given on the Title Page.  If there is no
      section entitled "History" in the Document, create one stating
      the title, year, authors, and publisher of the Document as given
      on its Title Page, then add an item describing the Modified
      Version as stated in the previous sentence.</para>
      </listitem>

      <listitem><para>Preserve the network
      location, if any, given in the Document for public access to a
      Transparent copy of the Document, and likewise the network
      locations given in the Document for previous versions it was
      based on.  These may be placed in the "History" section.  You
      may omit a network location for a work that was published at
      least four years before the Document itself, or if the original
      publisher of the version it refers to gives permission.</para>
      </listitem>

      <listitem><para>In any section entitled
      "Acknowledgements" or "Dedications", preserve the section's
      title, and preserve in the section all the substance and tone of
      each of the contributor acknowledgements and/or dedications
      given therein.</para>
      </listitem>

      <listitem><para>Preserve all the
      Invariant Sections of the Document, unaltered in their text and
      in their titles.  Section numbers or the equivalent are not
      considered part of the section titles.</para>
      </listitem>

      <listitem><para>Delete any section
      entitled "Endorsements".  Such a section may not be included in
      the Modified Version.</para>
      </listitem>

      <listitem><para>Do not retitle any
      existing section as "Endorsements" or to conflict in title with
      any Invariant Section.</para>
      </listitem>
    </orderedlist>
    
    <para>If the Modified Version includes new front-matter sections
    or appendices that qualify as Secondary Sections and contain no
    material copied from the Document, you may at your option
    designate some or all of these sections as invariant.  To do this,
    add their titles to the list of Invariant Sections in the Modified
    Version's license notice.  These titles must be distinct from any
    other section titles.</para>

    <para>You may add a section entitled "Endorsements", provided it
    contains nothing but endorsements of your Modified Version by
    various parties--for example, statements of peer review or that
    the text has been approved by an organization as the authoritative
    definition of a standard.</para>

    <para>You may add a passage of up to five words as a Front-Cover
    Text, and a passage of up to 25 words as a Back-Cover Text, to the
    end of the list of Cover Texts in the Modified Version.  Only one
    passage of Front-Cover Text and one of Back-Cover Text may be
    added by (or through arrangements made by) any one entity.  If the
    Document already includes a cover text for the same cover,
    previously added by you or by arrangement made by the same entity
    you are acting on behalf of, you may not add another; but you may
    replace the old one, on explicit permission from the previous
    publisher that added the old one.</para>

    <para>The author(s) and publisher(s) of the Document do not by
    this License give permission to use their names for publicity for
    or to assert or imply endorsement of any Modified Version.</para>
  </sect1>

  <sect1 label="5">
    <title>COMBINING DOCUMENTS</title>

    <para>You may combine the Document with other documents released
    under this License, under the terms defined in section 4 above for
    modified versions, provided that you include in the combination
    all of the Invariant Sections of all of the original documents,
    unmodified, and list them all as Invariant Sections of your
    combined work in its license notice.</para>

    <para>The combined work need only contain one copy of this
    License, and multiple identical Invariant Sections may be replaced
    with a single copy.  If there are multiple Invariant Sections with
    the same name but different contents, make the title of each such
    section unique by adding at the end of it, in parentheses, the
    name of the original author or publisher of that section if known,
    or else a unique number.  Make the same adjustment to the section
    titles in the list of Invariant Sections in the license notice of
    the combined work.</para>

    <para>In the combination, you must combine any sections entitled
    "History" in the various original documents, forming one section
    entitled "History"; likewise combine any sections entitled
    "Acknowledgements", and any sections entitled "Dedications".  You
    must delete all sections entitled "Endorsements."</para>
  </sect1>

  <sect1 label="6">
    <title>COLLECTIONS OF DOCUMENTS</title>

    <para>You may make a collection consisting of the Document and
    other documents released under this License, and replace the
    individual copies of this License in the various documents with a
    single copy that is included in the collection, provided that you
    follow the rules of this License for verbatim copying of each of
    the documents in all other respects.</para>

    <para>You may extract a single document from such a collection,
    and distribute it individually under this License, provided you
    insert a copy of this License into the extracted document, and
    follow this License in all other respects regarding verbatim
    copying of that document.</para>
  </sect1>

  <sect1 label="7">
    <title>AGGREGATION WITH INDEPENDENT WORKS</title>
    
    <para>A compilation of the Document or its derivatives with other
    separate and independent documents or works, in or on a volume of
    a storage or distribution medium, does not as a whole count as a
    Modified Version of the Document, provided no compilation
    copyright is claimed for the compilation.  Such a compilation is
    called an "aggregate", and this License does not apply to the
    other self-contained works thus compiled with the Document, on
    account of their being thus compiled, if they are not themselves
    derivative works of the Document.</para>

    <para>If the Cover Text requirement of section 3 is applicable to
    these copies of the Document, then if the Document is less than
    one quarter of the entire aggregate, the Document's Cover Texts
    may be placed on covers that surround only the Document within the
    aggregate.  Otherwise they must appear on covers around the whole
    aggregate.</para>
  </sect1>

  <sect1 label="8">
    <title>TRANSLATION</title>

    <para>Translation is considered a kind of modification, so you may
    distribute translations of the Document under the terms of section
    4.  Replacing Invariant Sections with translations requires
    special permission from their copyright holders, but you may
    include translations of some or all Invariant Sections in addition
    to the original versions of these Invariant Sections.  You may
    include a translation of this License provided that you also
    include the original English version of this License.  In case of
    a disagreement between the translation and the original English
    version of this License, the original English version will
    prevail.</para>
  </sect1>

  <sect1 label="9">
    <title>TERMINATION</title>
    
    <para>You may not copy, modify, sublicense, or distribute the
    Document except as expressly provided for under this License.  Any
    other attempt to copy, modify, sublicense or distribute the
    Document is void, and will automatically terminate your rights
    under this License.  However, parties who have received copies, or
    rights, from you under this License will not have their licenses
    terminated so long as such parties remain in full
    compliance.</para>
  </sect1>

  <sect1 label="10">
    <title>FUTURE REVISIONS OF THIS LICENSE</title>

    <para>The Free Software Foundation may publish new, revised
    versions of the GNU Free Documentation License from time to time.
    Such new versions will be similar in spirit to the present
    version, but may differ in detail to address new problems or
    concerns.  See <ulink
    url="http://www.gnu.org/copyleft/">http://www.gnu.org/copyleft/</ulink>.</para>

    <para>Each version of the License is given a distinguishing
    version number.  If the Document specifies that a particular
    numbered version of this License "or any later version" applies to
    it, you have the option of following the terms and conditions
    either of that specified version or of any later version that has
    been published (not as a draft) by the Free Software Foundation.
    If the Document does not specify a version number of this License,
    you may choose any version ever published (not as a draft) by the
    Free Software Foundation.</para>
  </sect1>

  <sect1 label="">
    <title>How to use this License for your documents</title>

    <para>To use this License in a document you have written, include
    a copy of the License in the document and put the following
    copyright and license notices just after the title page:</para>

<blockquote><para>
      Copyright (c)  YEAR  YOUR NAME.
      Permission is granted to copy, distribute and/or modify this document
      under the terms of the GNU Free Documentation License, Version 1.1
      or any later version published by the Free Software Foundation;
      with the Invariant Sections being LIST THEIR TITLES, with the
      Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
      A copy of the license is included in the section entitled "GNU
      Free Documentation License".
</para></blockquote>

    <para>If you have no Invariant Sections, write "with no Invariant
    Sections" instead of saying which ones are invariant.  If you have
    no Front-Cover Texts, write "no Front-Cover Texts" instead of
    "Front-Cover Texts being LIST"; likewise for Back-Cover
    Texts.</para>

    <para>If your document contains nontrivial examples of program
    code, we recommend releasing these examples in parallel under your
    choice of free software license, such as the GNU General Public
    License, to permit their use in free software.</para>
  </sect1>

</appendix>
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