Copyright (C) 2000,2001,2002 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.
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.
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 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.
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.
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 1.2
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.