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  licensee, and is addressed as "you".  You accept the license if you
  copy, modify or distribute the work in a way requiring permission
  under copyright law.
</p>

<p>
  A "Modified Version" of the Document means any work containing the
  Document or a portion of it, either copied verbatim, or with
  modifications and/or translated into another language.
</p>

<p>
  A "Secondary Section" is a named appendix or a front-matter section of
  the Document that deals exclusively with the relationship of the
  publishers or authors of the Document to the Document's overall subject
  (or to related matters) and contains nothing that could fall directly
  within that overall subject.  (Thus, if the Document is in part a
  textbook of mathematics, a Secondary Section may not explain any
  mathematics.)  The relationship could be a matter of historical
  connection with the subject or with related matters, or of legal,
  commercial, philosophical, ethical or political position regarding
  them.
</p>

<p>
  The "Invariant Sections" are certain Secondary Sections whose titles
  are designated, as being those of Invariant Sections, in the notice
  that says that the Document is released under this License.  If a
  section does not fit the above definition of Secondary then it is not
  allowed to be designated as Invariant.  The Document may contain zero
  Invariant Sections.  If the Document does not identify any Invariant
  Sections then there are none.
</p>

<p>
  The "Cover Texts" are certain short passages of text that are listed,
  as Front-Cover Texts or Back-Cover Texts, in the notice that says that
  the Document is released under this License.  A Front-Cover Text may
  be at most 5 words, and a Back-Cover Text may be at most 25 words.
</p>

<p>
  A "Transparent" copy of the Document means a machine-readable copy,
  represented in a format whose specification is available to the
  general public, that is suitable for revising the document
  straightforwardly with generic text editors or (for images composed of
  pixels) generic paint programs or (for drawings) some widely available
  drawing editor, and that is suitable for input to text formatters or
  for automatic translation to a variety of formats suitable for input
  to text formatters.  A copy made in an otherwise Transparent file
  format whose markup, or absence of markup, has been arranged to thwart
  or discourage subsequent modification by readers is not Transparent.
  An image format is not Transparent if used for any substantial amount
  of text.  A copy that is not "Transparent" is called "Opaque".
</p>

<p>
  Examples of suitable formats for Transparent copies include plain
  ASCII without markup, Texinfo input format, LaTeX input format, SGML
  or XML using a publicly available DTD, and standard-conforming simple
  HTML, PostScript or PDF designed for human modification.  Examples of
  transparent image formats include PNG, XCF and JPG.  Opaque formats
  include proprietary formats that can be read and edited only by
  proprietary word processors, SGML or XML for which the DTD and/or
  processing tools are not generally available, and the
  machine-generated HTML, PostScript or PDF produced by some word
  processors for output purposes only.
</p>

<p>
  The "Title Page" means, for a printed book, the title page itself,
  plus such following pages as are needed to hold, legibly, the material
  this License requires to appear in the title page.  For works in
  formats which do not have any title page as such, "Title Page" means
  the text near the most prominent appearance of the work's title,
  preceding the beginning of the body of the text.
</p>

<p>
  A section "Entitled XYZ" means a named subunit of the Document whose
  title either is precisely XYZ or contains XYZ in parentheses following
  text that translates XYZ in another language.  (Here XYZ stands for a
  specific section name mentioned below, such as "Acknowledgements",
  "Dedications", "Endorsements", or "History".)  To "Preserve the Title"
  of such a section when you modify the Document means that it remains a
  section "Entitled XYZ" according to this definition.
</p>

<p>
  The Document may include Warranty Disclaimers next to the notice which
  states that this License applies to the Document.  These Warranty
  Disclaimers are considered to be included by reference in this
  License, but only as regards disclaiming warranties: any other
  implication that these Warranty Disclaimers may have is void and has
  no effect on the meaning of this License.
</p>

<p>
  <strong>2. VERBATIM COPYING</strong>
</p>

<p>
  You may copy and distribute the Document in any medium, either
  commercially or noncommercially, provided that this License, the
  copyright notices, and the license notice saying this License applies
  to the Document are reproduced in all copies, and that you add no other
  conditions whatsoever to those of this License.  You may not use
  technical measures to obstruct or control the reading or further
  copying of the copies you make or distribute.  However, you may accept
  compensation in exchange for copies.  If you distribute a large enough
  number of copies you must also follow the conditions in section 3.
</p>

<p>
  You may also lend copies, under the same conditions stated above, and
  you may publicly display copies.
</p>

<p>
  <strong>3. COPYING IN QUANTITY</strong>
</p>

<p>
  If you publish printed copies (or copies in media that commonly have
  printed covers) of the Document, numbering more than 100, and the
  Document's license notice requires Cover Texts, you must enclose the
  copies in covers that carry, clearly and legibly, all these Cover
  Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
  the back cover.  Both covers must also clearly and legibly identify
  you as the publisher of these copies.  The front cover must present
  the full title with all words of the title equally prominent and
  visible.  You may add other material on the covers in addition.
  Copying with changes limited to the covers, as long as they preserve
  the title of the Document and satisfy these conditions, can be treated
  as verbatim copying in other respects.
</p>

<p>
  If the required texts for either cover are too voluminous to fit
  legibly, you should put the first ones listed (as many as fit
  reasonably) on the actual cover, and continue the rest onto adjacent
  pages.
</p>

<p>
  If you publish or distribute Opaque copies of the Document numbering
  more than 100, you must either include a machine-readable Transparent
  copy along with each Opaque copy, or state in or with each Opaque copy
  a computer-network location from which the general network-using
  public has access to download using public-standard network protocols
  a complete Transparent copy of the Document, free of added material.
  If you use the latter option, you must take reasonably prudent steps,
  when you begin distribution of Opaque copies in quantity, to ensure
  that this Transparent copy will remain thus accessible at the stated
  location until at least one year after the last time you distribute an
  Opaque copy (directly or through your agents or retailers) of that
  edition to the public.
</p>

<p>
  It is requested, but not required, that you contact the authors of the
  Document well before redistributing any large number of copies, to give
  them a chance to provide you with an updated version of the Document.
</p>

<p>
  <strong>4. MODIFICATIONS</strong>
</p>

<p>
  You may copy and distribute a Modified Version of the Document under
  the conditions of sections 2 and 3 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:
</p>

<ul>
  <li><strong>A.</strong> 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.</li>
  <li><strong>B.</strong> 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.</li>
  <li><strong>C.</strong> State on the Title page the name of the publisher of the
  Modified Version, as the publisher.</li>
  <li><strong>D.</strong> Preserve all the copyright notices of the Document.</li>
  <li><strong>E.</strong> Add an appropriate copyright notice for your modifications
  adjacent to the other copyright notices.</li>
  <li><strong>F.</strong> 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.</li>
  <li><strong>G.</strong> Preserve in that license notice the full lists of Invariant Sections
  and required Cover Texts given in the Document's license notice.</li>
  <li><strong>H.</strong> Include an unaltered copy of this License.</li>
  <li><strong>I.</strong> 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.</li>
  <li><strong>J.</strong> 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.</li>
  <li><strong>K.</strong> 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.</li>
  <li><strong>L.</strong> 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.</li>
  <li><strong>M.</strong> Delete any section Entitled "Endorsements".  Such a section
  may not be included in the Modified Version.</li>
  <li><strong>N.</strong> Do not retitle any existing section to be Entitled "Endorsements"
  or to conflict in title with any Invariant Section.</li>
  <li><strong>O.</strong> Preserve any Warranty Disclaimers.</li>
</ul>

<p>
  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.
</p>

<p>
  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.
</p>

<p>
  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.
</p>

<p>
  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