<section 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:</para>

    <para>A. 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>

    <para>B. 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>

    <para>C. State on the Title page the name of the publisher of the

    Modified Version, as the publisher.</para>

    <para>D. Preserve all the copyright notices of the

    Document.</para>

    <para>E. Add an appropriate copyright notice for your

    modifications adjacent to the other copyright notices.</para>

    <para>F. 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>

    <para>G. Preserve in that license notice the full lists of

    Invariant Sections and required Cover Texts given in the

    Document's license notice.</para>

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

    <para>I. Preserve the section Entitled ``History'', 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 ``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>

    <para>J. 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>

    <para>K. For any section Entitled ``Acknowledgements'' or

    ``Dedications'', 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>

    <para>L. 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>

    <para>M. Delete any section Entitled ``Endorsements''.  Such a

    section may not be included in the Modified Version.</para>

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

    ``Endorsements'' or to conflict in title with any Invariant

    Section.</para>

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

</section>