<sect1 id="licenses-gfdl-section-5" xreflabel="Modification">

    <title>Modifications</title>

    <para>You may copy and distribute a Modified Version of the

    Document under the conditions of sections 

    linkend="licenses-gfdl-section-3" /> and 

    linkend="licenses-gfdl-section-4" /> above, provided that you

    release the Modified Version under precisely this License, with

    the Modified Version filling the role of the Document, thus

    licensing distribution and modification of the Modified Version to

    whoever possesses a copy of it.  In addition, you must do these

    things in the Modified Version:

    <orderedlist numeration="upperalpha">

        <listitem>

            <para> Use in the Title Page (and on the covers, if any) a

            title distinct from that of the Document, and from those

            of previous versions (which should, if there were any, be

            listed in the History section of the Document).  You may

            use the same title as a previous version if the original

            publisher of that version gives permission.</para>

        </listitem>

        <listitem>

            <para>List on the Title Page, as authors, one or more

            persons or entities responsible for authorship of the

            modifications in the Modified Version, together with at

            least five of the principal authors of the Document (all

            of its principal authors, if it has fewer than five),

            unless they release you from this requirement.</para>

        </listitem>

        <listitem>

            <para>State on the Title page 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

            <quote>History</quote>, Preserve 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

            <quote>History</quote> 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 <quote>History</quote> 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>For any section Entitled

            <quote>Acknowledgements</quote> or

            <quote>Dedications</quote>, Preserve the Title of the

            section, 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 <quote>Endorsements</quote>.  Such

            a section may not be included in the Modified

            Version.</para>

        </listitem>

        <listitem>

            <para>Do not retitle any existing section to be Entitled

            <quote>Endorsements</quote> or to conflict in title with

            any Invariant Section.</para>

        </listitem>

        <listitem>

            <para>Preserve any Warranty Disclaimers.</para>

        </listitem>

    </orderedlist>

    </para>

    <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 <quote>Endorsements</quote>,

    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>