gfdl(7) - phpMan

GFDL(7) GNU GFDL(7)

NAME
gfdl - GNU Free Documentation License

DESCRIPTION
@comment For some cases, this default @node/@unnumbered is not applicable and @comment
causes warnings. In those cases, the including file can set @comment
nodefaultgnufreedocumentationlicensenode and provide it's own version. @comment F.i.,
when this file is included in an @raisesections context, the @comment including file can
use an @unnumberedsec.

GNU Free Documentation License
Version 1.3, 3 November 2008
Copyright (c) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
E<lt>B<http://fsf.org/>E<gt>

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

0. PREAMBLE

The purpose of this License is to make a manual, textbook, or other functional and
useful 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.

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.

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.

1. APPLICABILITY AND DEFINITIONS

This License applies to any manual or other work, in any medium, that contains a
notice placed by the copyright holder saying it can be distributed under the terms of
this License. Such a notice grants a world-wide, royalty-free license, unlimited in
duration, to use that work under the conditions stated herein. The "Document", below,
refers to any such manual or work. Any member of the public is a 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.

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.

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.

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.

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.

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".

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.

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.

The "publisher" means any person or entity that distributes copies of the Document to
the public.

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.

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.

2. VERBATIM COPYING

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.

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

3. COPYING IN QUANTITY

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.

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.

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.

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.

4. MODIFICATIONS

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:

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.

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.

C. State on the Title page the name of the publisher of the Modified Version, as the
publisher.

D. Preserve all the copyright notices of the Document.

E. Add an appropriate copyright notice for your modifications adjacent to the other
copyright notices.

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.

G. Preserve in that license notice the full lists of Invariant Sections and required
Cover Texts given in the Document's license notice.

H. Include an unaltered copy of this License.

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.

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.

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.

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.

M. Delete any section Entitled "Endorsements". Such a section may not be included in
the Modified Version.

N. Do not retitle any existing section to be Entitled "Endorsements" or to conflict
in title with any Invariant Section.

O. Preserve any Warranty Disclaimers.

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.

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.

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.

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.

5. COMBINING DOCUMENTS

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, and that you preserve all their Warranty Disclaimers.

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.

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."

6. COLLECTIONS OF DOCUMENTS

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.

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.

7. AGGREGATION WITH INDEPENDENT WORKS

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, is called
an "aggregate" if the copyright resulting from the compilation is not used to limit
the legal rights of the compilation's users beyond what the individual works permit.
When the Document is included in an aggregate, this License does not apply to the
other works in the aggregate which are not themselves derivative works of the
Document.

If the Cover Text requirement of section 3 is applicable to these copies of the
Document, then if the Document is less than one half of the entire aggregate, the
Document's Cover Texts may be placed on covers that bracket the Document within the
aggregate, or the electronic equivalent of covers if the Document is in electronic
form. Otherwise they must appear on printed covers that bracket the whole aggregate.

8. TRANSLATION

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,
and all the license notices in the Document, and any Warranty Disclaimers, provided
that you also include the original English version of this License and the original
versions of those notices and disclaimers. In case of a disagreement between the
translation and the original version of this License or a notice or disclaimer, the
original version will prevail.

If a section in the Document is Entitled "Acknowledgements", "Dedications", or
"History", the requirement (section 4) to Preserve its Title (section 1) will
typically require changing the actual title.

9. TERMINATION

You may not copy, modify, sublicense, or distribute the Document except as expressly
provided under this License. Any attempt otherwise to copy, modify, sublicense, or
distribute it is void, and will automatically terminate your rights under this
License.

However, if you cease all violation of this License, then your license from a
particular copyright holder is reinstated (a) provisionally, unless and until the
copyright holder explicitly and finally terminates your license, and (b) permanently,
if the copyright holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.

Moreover, your license from a particular copyright holder is reinstated permanently if
the copyright holder notifies you of the violation by some reasonable means, this is
the first time you have received notice of violation of this License (for any work)
from that copyright holder, and you cure the violation prior to 30 days after your
receipt of the notice.

Termination of your rights under this section does not terminate the licenses of
parties who have received copies or rights from you under this License. If your
rights have been terminated and not permanently reinstated, receipt of a copy of some
or all of the same material does not give you any rights to use it.

10. FUTURE REVISIONS OF THIS LICENSE

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 <http://www.gnu.org/copyleft/>.

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. If the Document specifies that a proxy can decide which
future versions of this License can be used, that proxy's public statement of
acceptance of a version permanently authorizes you to choose that version for the
Document.

11. RELICENSING

"Massive Multiauthor Collaboration Site" (or "MMC Site") means any World Wide Web
server that publishes copyrightable works and also provides prominent facilities for
anybody to edit those works. A public wiki that anybody can edit is an example of
such a server. A "Massive Multiauthor Collaboration" (or "MMC") contained in the site
means any set of copyrightable works thus published on the MMC site.

"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license published by
Creative Commons Corporation, a not-for-profit corporation with a principal place of
business in San Francisco, California, as well as future copyleft versions of that
license published by that same organization.

"Incorporate" means to publish or republish a Document, in whole or in part, as part
of another Document.

An MMC is "eligible for relicensing" if it is licensed under this License, and if all
works that were first published under this License somewhere other than this MMC, and
subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or
invariant sections, and (2) were thus incorporated prior to November 1, 2008.

The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA
on the same site at any time before August 1, 2009, provided the MMC is eligible for
relicensing.

ADDENDUM: How to use this License for your documents
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:

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 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled "GNU
Free Documentation License".

If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the
"with...Texts." line with this:

with the Invariant Sections being <list their titles>, with
the Front-Cover Texts being <list>, and with the Back-Cover Texts
being <list>.

If you have Invariant Sections without Cover Texts, or some other combination of the
three, merge those two alternatives to suit the situation.

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.