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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
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.. _fdl: |
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****************************** |
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GNU Free Documentation License |
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****************************** |
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.. _fdl-preamble: |
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0. PREAMBLE |
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=========== |
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The purpose of this License is to make a manual, textbook, or other |
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written document "free" in the sense of freedom: to assure everyone the |
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effective freedom to copy and redistribute it, with or without modifying |
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it, either commercially or noncommercially. Secondarily, this License |
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preserves for the author and publisher a way to get credit for their |
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work, while not being considered responsible for modifications made by |
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others. |
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This License is a kind of "copyleft", which means that derivative works |
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of the document must themselves be free in the same sense. It |
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complements the GNU General Public License, which is a copyleft license |
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designed for free software. |
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We have designed this License in order to use it for manuals for free |
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software, because free software needs free documentation: a free program |
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should come with manuals providing the same freedoms that the software |
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does. But this License is not limited to software manuals; it can be |
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used for any textual work, regardless of subject matter or whether it is |
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published as a printed book. We recommend this License principally for |
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works whose purpose is instruction or reference. |
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.. _fdl-section1: |
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1. APPLICABILITY AND DEFINITIONS |
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================================ |
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.. _fdl-document: |
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This License applies to any manual or other work that contains a notice |
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placed by the copyright holder saying it can be distributed under the |
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terms of this License. The "Document", below, refers to any such manual |
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or work. Any member of the public is a licensee, and is addressed as |
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"you". |
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.. _fdl-modified: |
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A "Modified Version" of the Document means any work containing the |
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Document or a portion of it, either copied verbatim, or with |
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modifications and/or translated into another language. |
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.. _fdl-secondary: |
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A "Secondary Section" is a named appendix or a front-matter section of |
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the :ref:`Document <fdl-document>` that deals exclusively with the |
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relationship of the publishers or authors of the Document to the |
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Document's overall subject (or to related matters) and contains nothing |
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that could fall directly within that overall subject. (For example, if |
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the Document is in part a textbook of mathematics, a Secondary Section |
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may not explain any mathematics.) The relationship could be a matter of |
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historical connection with the subject or with related matters, or of |
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legal, commercial, philosophical, ethical or political position |
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regarding them. |
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.. _fdl-invariant: |
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The "Invariant Sections" are certain |
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:ref:`Secondary Sections <fdl-secondary>` whose titles are designated, |
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as being those of Invariant Sections, in the notice that says that the |
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:ref:`Document <fdl-document>` is released under this License. |
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.. _fdl-cover-texts: |
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The "Cover Texts" are certain short passages of text that are listed, as |
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Front-Cover Texts or Back-Cover Texts, in the notice that says that the |
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:ref:`Document <fdl-document>` is released under this License. |
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.. _fdl-transparent: |
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A "Transparent" copy of the :ref:`Document <fdl-document>` means a |
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machine-readable copy, represented in a format whose specification is |
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available to the general public, whose contents can be viewed and edited |
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directly and straightforwardly with generic text editors or (for images |
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composed of pixels) generic paint programs or (for drawings) some widely |
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available drawing editor, and that is suitable for input to text |
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formatters or for automatic translation to a variety of formats suitable |
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for input to text formatters. A copy made in an otherwise Transparent |
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file format whose markup has been designed to thwart or discourage |
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subsequent modification by readers is not Transparent. A copy that is |
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not "Transparent" is called "Opaque". |
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Examples of suitable formats for Transparent copies include plain ASCII |
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without markup, Texinfo input format, LaTeX input format, SGML or XML |
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using a publicly available DTD, and standard-conforming simple HTML |
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designed for human modification. Opaque formats include PostScript, PDF, |
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proprietary formats that can be read and edited only by proprietary word |
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processors, SGML or XML for which the DTD and/or processing tools are |
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not generally available, and the machine-generated HTML produced by some |
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word processors for output purposes only. |
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.. _fdl-title-page: |
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The "Title Page" means, for a printed book, the title page itself, plus |
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such following pages as are needed to hold, legibly, the material this |
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License requires to appear in the title page. For works in formats which |
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do not have any title page as such, "Title Page" means the text near the |
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most prominent appearance of the work's title, preceding the beginning |
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of the body of the text. |
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.. _fdl-section2: |
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2. VERBATIM COPYING |
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=================== |
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You may copy and distribute the :ref:`Document <fdl-document>` in any |
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medium, either commercially or noncommercially, provided that this |
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License, the copyright notices, and the license notice saying this |
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License applies to the Document are reproduced in all copies, and that |
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you add no other conditions whatsoever to those of this License. You may |
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not use technical measures to obstruct or control the reading or further |
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copying of the copies you make or distribute. However, you may accept |
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compensation in exchange for copies. If you distribute a large enough |
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number of copies you must also follow the conditions in |
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:ref:`section 3 <fdl-section3>`. |
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You may also lend copies, under the same conditions stated above, and |
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you may publicly display copies. |
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.. _fdl-section3: |
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3. COPYING IN QUANTITY |
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====================== |
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If you publish printed copies of the :ref:`Document <fdl-document>` |
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numbering more than 100, and the Document's license notice requires |
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:ref:`Cover Texts <fdl-cover-texts>`, you must enclose the copies in |
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covers that carry, clearly and legibly, all these Cover Texts: |
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Front-Cover Texts on the front cover, and Back-Cover Texts on the back |
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cover. Both covers must also clearly and legibly identify you as the |
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publisher of these copies. The front cover must present the full title |
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with all words of the title equally prominent and visible. You may add |
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other material on the covers in addition. Copying with changes limited |
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to the covers, as long as they preserve the title of the |
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:ref:`Document <fdl-document>` and satisfy these conditions, can be |
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treated as verbatim copying in other respects. |
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If the required texts for either cover are too voluminous to fit |
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legibly, you should put the first ones listed (as many as fit |
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reasonably) on the actual cover, and continue the rest onto adjacent |
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pages. |
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If you publish or distribute :ref:`Opaque <fdl-transparent>` copies of |
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the :ref:`Document <fdl-document>` numbering more than 100, you must |
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either include a machine-readable :ref:`Transparent <fdl-transparent>` |
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copy along with each Opaque copy, or state in or with each Opaque copy a |
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publicly-accessible computer-network location containing a complete |
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Transparent copy of the Document, free of added material, which the |
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general network-using public has access to download anonymously at no |
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charge using public-standard network protocols. If you use the latter |
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option, you must take reasonably prudent steps, when you begin |
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distribution of Opaque copies in quantity, to ensure that this |
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Transparent copy will remain thus accessible at the stated location |
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until at least one year after the last time you distribute an Opaque |
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copy (directly or through your agents or retailers) of that edition to |
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the public. |
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It is requested, but not required, that you contact the authors of the |
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:ref:`Document <fdl-document>` well before redistributing any large |
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number of copies, to give them a chance to provide you with an updated |
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version of the Document. |
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.. _fdl-section4: |
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4. MODIFICATIONS |
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================ |
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You may copy and distribute a :ref:`Modified Version <fdl-modified>` |
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of the :ref:`Document <fdl-document>` under the conditions of sections |
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:ref:`2 <fdl-section2>` and :ref:`3 <fdl-section3>` above, provided |
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that you release the Modified Version under precisely this License, with |
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the Modified Version filling the role of the Document, thus licensing |
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distribution and modification of the Modified Version to whoever |
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possesses a copy of it. In addition, you must do these things in the |
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Modified Version: |
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- **A.** |
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Use in the :ref:`Title Page <fdl-title-page>` (and on the covers, |
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if any) a title distinct from that of the |
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:ref:`Document <fdl-document>`, and from those of previous versions |
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(which should, if there were any, be listed in the History section of |
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the Document). You may use the same title as a previous version if |
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the original publisher of that version gives permission. |
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- **B.** |
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List on the :ref:`Title Page <fdl-title-page>`, as authors, one or |
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more persons or entities responsible for authorship of the |
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modifications in the :ref:`Modified Version <fdl-modified>`, |
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together with at least five of the principal authors of the |
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:ref:`Document <fdl-document>` (all of its principal authors, if it |
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has less than five). |
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- **C.** |
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State on the :ref:`Title Page <fdl-title-page>` the name of the |
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publisher of the :ref:`Modified Version <fdl-modified>`, as the |
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publisher. |
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- **D.** |
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Preserve all the copyright notices of the |
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:ref:`Document <fdl-document>`. |
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- **E.** |
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Add an appropriate copyright notice for your modifications adjacent |
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to the other copyright notices. |
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- **F.** |
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Include, immediately after the copyright notices, a license notice |
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giving the public permission to use the |
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:ref:`Modified Version <fdl-modified>` under the terms of this |
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License, in the form shown in the Addendum below. |
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- **G.** |
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Preserve in that license notice the full lists of |
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:ref:`Invariant Sections <fdl-invariant>` and required |
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:ref:`Cover Texts <fdl-cover-texts>` given in the |
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:ref:`Document's <fdl-document>` license notice. |
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- **H.** |
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Include an unaltered copy of this License. |
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- **I.** |
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Preserve the section entitled "History", and its title, and add to it |
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an item stating at least the title, year, new authors, and publisher |
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of the :ref:`Modified Version <fdl-modified>` as given on the |
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:ref:`Title Page <fdl-title-page>`. If there is no section entitled |
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"History" in the :ref:`Document <fdl-document>`, create one stating |
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the title, year, authors, and publisher of the Document as given on |
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its Title Page, then add an item describing the Modified Version as |
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stated in the previous sentence. |
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- **J.** |
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Preserve the network location, if any, given in the |
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:ref:`Document <fdl-document>` for public access to a |
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:ref:`Transparent <fdl-transparent>` copy of the Document, and |
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likewise the network locations given in the Document for previous |
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versions it was based on. These may be placed in the "History" |
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section. You may omit a network location for a work that was |
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published at least four years before the Document itself, or if the |
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original publisher of the version it refers to gives permission. |
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- **K.** |
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In any section entitled "Acknowledgements" or "Dedications", preserve |
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the section's title, and preserve in the section all the substance |
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and tone of each of the contributor acknowledgements and/or |
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dedications given therein. |
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- **L.** |
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Preserve all the :ref:`Invariant Sections <fdl-invariant>` of the |
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:ref:`Document <fdl-document>`, unaltered in their text and in |
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their titles. Section numbers or the equivalent are not considered |
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part of the section titles. |
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- **M.** |
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Delete any section entitled "Endorsements". Such a section may not be |
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included in the :ref:`Modified Version <fdl-modified>`. |
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- **N.** |
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Do not retitle any existing section as "Endorsements" or to conflict |
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in title with any :ref:`Invariant Section <fdl-invariant>`. |
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If the :ref:`Modified Version <fdl-modified>` includes new |
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front-matter sections or appendices that qualify as |
|
:ref:`Secondary Sections <fdl-secondary>` and contain no material |
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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 |
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of :ref:`Invariant Sections <fdl-invariant>` in the Modified Version's |
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license notice. These titles must be distinct from any other section |
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titles. |
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You may add a section entitled "Endorsements", provided it contains |
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nothing but endorsements of your |
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:ref:`Modified Version <fdl-modified>` by various parties--for |
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example, statements of peer review or that the text has been approved by |
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an organization as the authoritative definition of a standard. |
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You may add a passage of up to five words as a |
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:ref:`Front-Cover Text <fdl-cover-texts>`, and a passage of up to 25 |
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words as a :ref:`Back-Cover Text <fdl-cover-texts>`, to the end of the |
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list of :ref:`Cover Texts <fdl-cover-texts>` in the |
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:ref:`Modified Version <fdl-modified>`. Only one passage of |
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Front-Cover Text and one of Back-Cover Text may be added by (or through |
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arrangements made by) any one entity. If the |
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:ref:`Document <fdl-document>` already includes a cover text for the |
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same cover, previously added by you or by arrangement made by the same |
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entity you are acting on behalf of, you may not add another; but you may |
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replace the old one, on explicit permission from the previous publisher |
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that added the old one. |
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The author(s) and publisher(s) of the :ref:`Document <fdl-document>` |
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do not by this License give permission to use their names for publicity |
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for or to assert or imply endorsement of any |
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:ref:`Modified Version <fdl-modified>`. |
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.. _fdl-section5: |
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5. COMBINING DOCUMENTS |
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====================== |
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You may combine the :ref:`Document <fdl-document>` with other |
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documents released under this License, under the terms defined in |
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:ref:`section 4 <fdl-section4>` above for modified versions, provided |
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that you include in the combination all of the |
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:ref:`Invariant Sections <fdl-invariant>` of all of the original |
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documents, unmodified, and list them all as Invariant Sections of your |
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combined work in its license notice. |
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The combined work need only contain one copy of this License, and |
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multiple identical :ref:`Invariant Sections <fdl-invariant>` may be |
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replaced with a single copy. If there are multiple Invariant Sections |
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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 |
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the original author or publisher of that section if known, or else a |
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unique number. Make the same adjustment to the section titles in the |
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list of Invariant Sections in the license notice of the combined work. |
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In the combination, you must combine any sections entitled "History" in |
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the various original documents, forming one section entitled "History"; |
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likewise combine any sections entitled "Acknowledgements", and any |
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sections entitled "Dedications". You must delete all sections entitled |
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"Endorsements." |
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.. _fdl-section6: |
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6. COLLECTIONS OF DOCUMENTS |
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=========================== |
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You may make a collection consisting of the |
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:ref:`Document <fdl-document>` and other documents released under this |
|
License, and replace the individual copies of this License in the |
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various documents with a single copy that is included in the collection, |
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provided that you follow the rules of this License for verbatim copying |
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of each of the documents in all other respects. |
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You may extract a single document from such a collection, and distribute |
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it individually under this License, provided you insert a copy of this |
|
License into the extracted document, and follow this License in all |
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other respects regarding verbatim copying of that document. |
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.. _fdl-section7: |
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7. AGGREGATION WITH INDEPENDENT WORKS |
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===================================== |
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A compilation of the :ref:`Document <fdl-document>` or its derivatives |
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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 :ref:`Modified Version <fdl-modified>` 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. If the :ref:`Cover Text <fdl-cover-texts>` |
|
requirement of :ref:`section 3 <fdl-section3>` is applicable to these |
|
copies of the Document, then if the Document is less than one quarter of |
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the entire aggregate, the Document's Cover Texts may be placed on covers |
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that surround only the Document within the aggregate. Otherwise they |
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must appear on covers around the whole aggregate. |
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.. _fdl-section8: |
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8. TRANSLATION |
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============== |
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Translation is considered a kind of modification, so you may distribute |
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translations of the :ref:`Document <fdl-document>` under the terms of |
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:ref:`section 4 <fdl-section4>`. Replacing |
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:ref:`Invariant Sections <fdl-invariant>` 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 |
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original English version will prevail. |
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.. _fdl-section9: |
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9. TERMINATION |
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============== |
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You may not copy, modify, sublicense, or distribute the |
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:ref:`Document <fdl-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. |
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.. _fdl-section10: |
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10. FUTURE REVISIONS OF THIS LICENSE |
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==================================== |
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The `Free Software Foundation <http://www.gnu.org/fsf/fsf.html>`__ |
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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 |
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`http://www.gnu.org/copyleft/ <http://www.gnu.org/copyleft>`__. |
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|
|
Each version of the License is given a distinguishing version number. If |
|
the :ref:`Document <fdl-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. |
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.. _fdl-using: |
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Addendum |
|
======== |
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|
|
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: |
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|
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Copyright © YEAR YOUR NAME. |
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|
|
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 :ref:`Invariant Sections <fdl-invariant>` |
|
being LIST THEIR TITLES, with the |
|
:ref:`Front-Cover Texts <fdl-cover-texts>` being LIST, and with |
|
the :ref:`Back-Cover Texts <fdl-cover-texts>` being LIST. A copy |
|
of the license is included in the section entitled "GNU Free |
|
Documentation License". |
|
|
|
If you have no :ref:`Invariant Sections <fdl-invariant>`, write "with |
|
no Invariant Sections" instead of saying which ones are invariant. If |
|
you have no :ref:`Front-Cover Texts <fdl-cover-texts>`, write "no |
|
Front-Cover Texts" instead of "Front-Cover Texts being LIST"; likewise |
|
for :ref:`Back-Cover Texts <fdl-cover-texts>`. |
|
|
|
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 <http://www.gnu.org/copyleft/gpl.html>`__, |
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to permit their use in free software.
|
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