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- <H2><A NAME="s4">4. GNU Free Documentation License</A> </H2>
- <P>Version 1.1, March 2000
- <P>Copyright (C) 2000 Free Software Foundation, Inc.
- 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
- <H2><A NAME="ss4.1">4.1 PREAMBLE</A>
- </H2>
- <P>The purpose of this License is to make a manual, textbook,
- or other written document "free" in the sense of freedom: to
- assure everyone the effective freedom to copy and redistribute it,
- with or without modifying it, either commercially or
- noncommercially. Secondarily, this License preserves for the
- author and publisher a way to get credit for their work, while not
- being considered responsible for modifications made by
- others.
- <P>This License is a kind of "copyleft", which means that
- derivative works of the document must themselves be free in the
- same sense. It complements the GNU General Public License, which
- is a copyleft license designed for free software.
- <P>We have designed this License in order to use it for manuals
- for free software, because free software needs free documentation:
- a free program should come with manuals providing the same
- freedoms that the software does. But this License is not limited
- to software manuals; it can be used for any textual work,
- regardless of subject matter or whether it is published as a
- printed book. We recommend this License principally for works
- whose purpose is instruction or reference.
- <H2><A NAME="ss4.2">4.2 APPLICABILITY AND DEFINITIONS</A>
- </H2>
- <P>This License applies to any manual or other work that
- contains a notice placed by the copyright holder saying it can be
- distributed under the terms of this License. The "Document",
- below, refers to any such manual or work. Any member of the
- public is a licensee, and is addressed as "you".
- <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>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.
- (For example, 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>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.
- <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.
- <P>A "Transparent" copy of the Document means a
- machine-readable copy, represented in a format whose specification
- is available to the general public, whose contents can be viewed
- and edited directly and 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 has been designed to thwart or discourage subsequent
- modification by readers is not Transparent. A copy that is not
- "Transparent" is called "Opaque".
- <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 designed for human modification.
- Opaque formats include PostScript, PDF, 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 produced by some word
- processors for output purposes only.
- <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.
- <H2><A NAME="ss4.3">4.3 VERBATIM COPYING</A>
- </H2>
- <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>You may also lend copies, under the same conditions stated
- above, and you may publicly display copies.
- <H2><A NAME="ss4.4">4.4 COPYING IN QUANTITY</A>
- </H2>
- <P>If you publish printed copies 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>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>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 publicly-accessible
- computer-network location containing a complete Transparent copy
- of the Document, free of added material, which the general
- network-using public has access to download anonymously at no
- charge using public-standard network protocols. 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>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.
- <H2><A NAME="ss4.5">4.5 MODIFICATIONS</A>
- </H2>
- <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>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>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 less than
- five).</LI>
- <LI>State on the Title page
- the name of the publisher of the Modified Version, as the
- publisher.</LI>
- <LI>Preserve all the
- copyright notices of the Document.</LI>
- <LI>Add an appropriate
- copyright notice for your modifications adjacent to the other
- copyright notices.</LI>
- <LI>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>Preserve in that license
- notice the full lists of Invariant Sections and required Cover
- Texts given in the Document's license notice.</LI>
- <LI>Include an unaltered
- copy of this License.</LI>
- <LI>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.</LI>
- <LI>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>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.</LI>
- <LI>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>Delete any section
- entitled "Endorsements". Such a section may not be included in
- the Modified Version.</LI>
- <LI>Do not retitle any
- existing section as "Endorsements" or to conflict in title with
- any Invariant Section.</LI>
- </UL>
- <P>
- <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>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>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>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.
- <H2><A NAME="ss4.6">4.6 COMBINING DOCUMENTS</A>
- </H2>
- <P>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.
- <P>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.
- <P>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."
- <H2><A NAME="ss4.7">4.7 COLLECTIONS OF DOCUMENTS</A>
- </H2>
- <P>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.
- <P>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.
- <H2><A NAME="ss4.8">4.8 AGGREGATION WITH INDEPENDENT WORKS</A>
- </H2>
- <P>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.
- <P>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.
- <H2><A NAME="ss4.9">4.9 TRANSLATION</A>
- </H2>
- <P>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.
- <H2><A NAME="ss4.10">4.10 TERMINATION</A>
- </H2>
- <P>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.
- <H2><A NAME="ss4.11">4.11 FUTURE REVISIONS OF THIS LICENSE</A>
- </H2>
- <P>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
- <A HREF="http://www.gnu.org/copyleft/">http://www.gnu.org/copyleft/</A>.
- <P>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.
- <H2><A NAME="ss4.12">4.12 How to use this License for your documents</A>
- </H2>
- <P>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:
- <P><CODE>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".</CODE>
- <P>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.
- <P>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.
- <HR>
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