LibrePlanet2022: Add introduction

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

16 files changed, 1004 insertions, 0 deletions

diff --git a/.gitmodules b/.gitmodules
index 1986570..149acf6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,7 @@
 [submodule "Replicant_contributors_meeting_27_28_July_2019_Paris_France/bootloaders/replicant_website"]
 	path = external_resources/replicant_website
 	url = https://git.replicant.us/replicant/website.git
+[submodule "external_resources/vendor_replicant_artwork"]
+	path = external_resources/vendor_replicant_artwork
+	url = https://git.replicant.us/replicant/vendor_replicant_artwork.git
+	branch = main
diff --git a/LibrePlanet2022/Makefile b/LibrePlanet2022/Makefile
new file mode 100644
index 0000000..a02a938
--- /dev/null
+++ b/LibrePlanet2022/Makefile
@@ -0,0 +1,64 @@
+TEXFLAGS ?= -halt-on-error -output-format pdf -output-directory output
+TITLE = Struggle_for_independence
+
+.PHONY: all clean medias
+all: output/$(TITLE).pdf
+
+output:
+	mkdir output
+
+output/$(TITLE).pdf: \
+	Struggle_for_independence.tex \
+	output \
+	output/android_logo.png \
+	output/framework.png \
+	output/freedo.png \
+	output/i9300_left.png \
+	output/n900.png \
+	output/replicant_logo_alpha.png \
+	output/tablets.png \
+	output/wifi.png
+	pdflatex $(TEXFLAGS) '\providecommand\locale{en}\input{$(TITLE).tex}'
+	# pdflatex $(TEXFLAGS) '\providecommand\locale{en}\input{$(TITLE).tex}'
+
+output/android_logo.png: images/Android_Robot_Cleaner_2014-2019.svg output
+	convert $< $@
+
+output/freedo.png: images/Freedo_improved.svg output
+	convert $< $@
+
+output/i9300_hardware.png: ../common/images/i9300_hardware.svg output
+	convert $< $@
+
+output/i9300_left.png: output/i9300_hardware.png output
+	convert $< -crop 50%x0%+0+0 $@
+
+output/n900.png: images/N900_xterm.JPG images/Nokia_N900-6.jpg
+	mkdir -p output
+	convert -append -gravity center $? $@
+
+output/replicant_logo_alpha.png: ../external_resources/vendor_replicant_artwork/replicant_logo_alpha.png output
+	convert $< $@
+
+output/tablets.png: \
+	../external_resources/replicant_website/images/supported-devices/p3100.png \
+	../external_resources/replicant_website/images/supported-devices/p5100.png
+	mkdir -p output
+	convert -append $? $@
+
+output/wifi.png: \
+	images/tehnoetic-n150-mini-wifi-adapter-back-500x500.png \
+	images/tet-otg-side-500x500.jpg \
+	images/Wifi.png
+	mkdir -p output
+	convert -append -gravity center $? $@
+
+output/%.png: dot/%.dot output
+	dot -T png $< > $@
+
+clean:
+	rm -rf output
+
+output/%.png: dot/%.dot
+	mkdir -p output
+	dot -T png $< > $@
diff --git a/LibrePlanet2022/Struggle_for_independence.tex b/LibrePlanet2022/Struggle_for_independence.tex
new file mode 100644
index 0000000..3b45186
--- /dev/null
+++ b/LibrePlanet2022/Struggle_for_independence.tex
@@ -0,0 +1,367 @@
+\documentclass{beamer}
+\usepackage[english]{babel}
+\usepackage{color}
+\usepackage{CJKutf8}
+\usepackage{graphicx}
+\usepackage{ifthen}
+\usepackage[utf8]{inputenc}
+\usepackage{listings}
+\usepackage{longtable}
+\usepackage{pdfpages}
+\usepackage{xtab}
+
+\lstdefinestyle{terminal}{
+  backgroundcolor=\color{black},
+  basicstyle=\scriptsize\color{green},
+}
+
+\newcommand{\devicepicture}[1]{../external_resources/replicant_website/images/supported-devices/#1.png}
+
+\newcommand{\includedevicepicture}[1]{
+  {\includegraphics[width=.2\textwidth]{\devicepicture{#1}}}
+}
+
+\newcommand{\inlinepicture}[3]
+{
+  \ifthenelse{\equal{right}{#2}}{
+    \begin{longtable}{p{5cm} p{5cm}}
+      {#3} & {
+        \noindent
+        \resizebox{\textwidth / 2}{\textheight * 9 / 10}
+                  {\includegraphics{#1}}
+      }
+    \end{longtable}
+  }{}
+  \ifthenelse{\equal{top}{#2}}{
+    \noindent
+    \resizebox{\textwidth}{\textheight * 2 / 3}{\includegraphics{#1}}
+    {#3}
+  }{}
+}
+
+\usetheme{Singapore}
+
+\title{Replicant: Struggle for independence}
+\author{Denis 'GNUtoo' Carikli}
+\date{March 20, 2022}
+
+\begin{document}
+
+\maketitle
+
+\begin{frame}
+  \center{Presentation structure:}
+  \begin{itemize}
+  \item Introduction
+    \begin{itemize}
+    \item What is a smartphone?
+    \item What is Replicant? Why Replicant exists?
+    \item Android architecture
+    \end{itemize}
+  \end{itemize}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\section{Introduction}
+
+\begin{frame}
+  \center{Introduction}
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/replicant_logo_alpha.png}{right}{
+    \center{Replicant:}
+    \begin{itemize}
+    \item Fully free Android distribution approved by the FSF
+    \item But the hardware it runs on is not...
+    \item More details on hardware related freedom issues later %% TODO
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{Quick Facts}
+  \begin{itemize}
+  \item Website: replicant.us
+  \item Exists since September 2009
+  \item Two main versions:
+    \begin{itemize}
+    \item Replicant 6:
+      \begin{itemize}
+      \item Android 6, last security update: October 2017
+        \cite{last-android-6-update}
+      \item based on LineageOS
+      \item Supports $\sim$ 10 devices (smartphones and tablets)
+      \end{itemize}
+    \item Replicant 11:
+      \begin{itemize}
+      \item Android 11, work in progress\cite{porting-to-android-11}
+      \item based on official Android source code
+      \end{itemize}
+    \end{itemize}
+  \item $\sim$ About 1 full time equivalent contributors and a community of
+    users and contributors
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \begin{xtabular}{llll}
+    \includedevicepicture{i9100} &
+    \includedevicepicture{maguro} &
+    \includedevicepicture{i9300} &
+    \includedevicepicture{n7000} \\
+    \includedevicepicture{n7100} &
+    \includedevicepicture{n5100} &
+    \includedevicepicture{p3100} &
+    \includedevicepicture{p5100} \\
+  \end{xtabular}
+\end{frame}
+
+\begin{frame}
+  \center{Best (and lot of) effort:}
+  \inlinepicture{images/African_American_worker_Richmond_Shipyards.jpg}{right}{
+    \begin{itemize}
+    \item Display working and graphics fast enough
+    \item Sound working
+    \item Be able to make calls
+    \item etc
+    \item GPS, Camera, and other non crucial hardware may not work, or work in
+      later releases
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{A very short introduction on hardware:}
+  \inlinepicture{output/i9300_hardware.png}{top}{
+    \begin{itemize}
+    \item System on a chip
+    \item Smartphones and the modem
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{Modem issues:}
+  \begin{itemize}
+  \item Nonfree firmware
+    \begin{itemize}
+    \item $\rightarrow$ Only 1 free firmware for very old modems (2005)
+      \cite{OsmocomBB}\cite{motorola-c115}
+    \item Too much work for Replicant
+    \end{itemize}
+  \item Modem isolation
+    \begin{itemize}
+    \item $\rightarrow$ Select smartphones with good isolation:
+      \begin{itemize}
+      \item HSIC and firmware data controlled by Replicant
+      \item MIPI
+      \item USB and free bootloader
+      \item UART
+      \item Avoid shared memory
+      \end{itemize}
+    \end{itemize}
+  \item Tracking $\rightarrow$ No real solution
+    \begin{itemize}
+    \item Community networks (Indigenous communities in Oxaca)
+    \item Disable the modem $\rightarrow$ no calls, SMS or data connection
+    \end{itemize}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/tablets.png}{right}{
+    \center{Devices without modems?}
+    \begin{itemize}
+    \item Some tablets don't have any modem
+    \item Possible to "disable" the modem on some devices.
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/Wifi.png}{right}{
+    \center{WiFi: No free firmwares for chip used in mobile devices}
+    \begin{itemize}
+    \item ath9k compatible adapters consume too much power,
+      require PCIe $\rightarrow$ not used in devices.
+    \item We badly need help for free firmwares:
+      \begin{itemize}
+      \item Broadcom chips through Nexmon ?
+      \item Realtek by reverse engineering GPL binary fimrwares?
+      \end{itemize}
+    \item USB device used (ath9k\_htc compatible) in the meantime
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/i9300_left.png}{right}{
+    \center{Additional issues:}
+    \begin{itemize}
+    \item Nonfree bootloader
+      \begin{itemize}
+      \item The SOC enforces signatures
+      \item TrustZone OS on some devices
+      \item Incompatible with Linux
+      \item Hard to support in Replicant 11 and GNU/Linux
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{Why Android?}
+  \inlinepicture{output/android_logo.png}{right}{
+    \begin{itemize}
+    \item GUI and applications adapted to big fingers
+    \item $\rightarrow$ run on devices that:
+      \begin{itemize}
+      \item Lack keyboard
+      \item Have capacitve touchscreen and no stylus
+      \item Have very small displays with very high number of pixel
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{Issues with Android?}
+  \inlinepicture{images/IMG_20180428_200243.jpg}{right}{
+    \begin{itemize}
+    \item Part of the GNU/Linux architecture is light years away:
+      package management and build system, graphics, audio, etc
+    \item Huge unknown code from Google
+    \item Meant to run proprietary software, not to empower users
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{images/smart_phones_shop.jpg}{right}{
+    \center{Android architecture}
+    \begin{itemize}
+    \item Goals: time to market
+      \begin{itemize}
+      \item Write the code that work as fast as possible
+      \item Support as many hardware features as possible including new hardware
+      \item $\rightarrow$ Varying code quality
+      \item $\rightarrow$ Example: One driver rewritten 3 times %% TODO: reference
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/framework.png}{right}{
+    \center{How it's done?}
+    \begin{itemize}
+    \item Breaking Kernel API and ABI
+      \begin{itemize}
+      \item It can take time (years) to bring in a new framework in Linux
+      \item Example of API breakage: HTC dream audio driver
+      \item Solution: Apps $\leftrightarrow$ Android framework $\leftrightarrow$
+        HAL $\leftrightarrow$ Kernel
+      \item Getting better in Android: Trebble and Generic Kernel images
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \inlinepicture{output/n900.png}{right}{
+    \center{Not Android specific}
+    \begin{itemize}
+    \item N900
+      \begin{itemize}
+      \item Took (years) to have the mediactl API in Linux
+      \item $\rightarrow$ hacks in the vendor kernel
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+\begin{frame}
+  \center{Ugly vendor code is good as we depend it for freedom}
+  \inlinepicture{output/freedo.png}{right}{
+    \begin{itemize}
+    \item Having the source code under free software licenses, even if the code
+      quality is bad is crucial for freedom:
+      \begin{itemize}
+      \item Hardware bringup is often made that way anyway
+      \item Code can always be cleaned up or rewritten later
+      \item Worst case: use the source code as documentation or reverse engineer
+        it (add prints)
+      \end{itemize}
+    \end{itemize}
+  }
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\begin{frame}
+  \begin{itemize}
+  \item WiFi logo:
+    \url{https://commons.wikimedia.org/wiki/File:Wifi.png}
+    Public domain, probably trademarked.
+  \item Freedo Redrawn version:
+    \url{https://www.gnu.org/graphics/freedo.html}
+    GNU Free Documentation License 1.3 or later
+  \item Android logo
+    \url{https://commons.wikimedia.org/wiki/File:Android_Robot_Cleaner_(2014-2019).svg}
+    CC BY-SA 4.0 International
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \begin{itemize}
+  \item Googlag
+    \url{https://wiki.fuckoffgoogle.de/index.php?title=File:IMG_20180428_200243.jpg}
+    CC BY-SA
+  \item Worker
+    \url{https://commons.wikimedia.org/wiki/File:African_American_worker_Richmond_Shipyards.jpg}
+    Public domain
+  \item N900 kernel
+    \url{https://commons.wikimedia.org/wiki/File:N900_xterm.JPG}
+    CC-BY-SA 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic
+  \item N900 camera
+    \url{https://commons.wikimedia.org/wiki/File:Nokia_N900-6.jpg}
+    CC-BY 2.0 Generic
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \begin{itemize}
+  \item Phone shop
+    %% File:HK WC 灣仔 Wan Chai 莊士敦道 Johnston Road shop window display smart phones August 2021 SS2.jpg
+    \url{https://commons.wikimedia.org/wiki/File:HK\_WC\_\%E7\%81\%A3\%E4\%BB\%94\_Wan\_Chai\_\%E8\%8E\%8A\%E5\%A3\%AB\%E6\%95\%A6\%E9\%81\%93\_Johnston\_Road\_shop\_window\_display\_smart\_phones\_August\_2021\_SS2.jpg}
+    CC-BY-SA 4.0 International
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \begin{itemize}
+  \item Replicant devices and logo:
+    \begin{itemize}
+    \item Replicant Logo
+      \url{https://git.replicant.us/replicant/vendor_replicant_artwork/plain/replicant_logo_alpha.svg?h=main&id=fc213d2ca94cef9047d1e4a71c21c4c4c87f349d}
+      CC-BY-SA 3.0 Unported
+    \item Replicant devices
+      \url{https://git.replicant.us/infrastructure/www.replicant.us/tree/images/supported-devices?id=2a331698cead2677fa953c3e1ab5d78528e39ef9}
+      CC-BY-SA 3.0 Unported
+    \end{itemize}
+  \end{itemize}
+\end{frame}
+
+\begin{thebibliography}{99}
+\bibitem{OsmocomBB}
+  \url{https://osmocom.org/projects/baseband/wiki}
+\bibitem{motorola-c123}
+  The motorola c115 is from 2005
+  \url{https://en.wikipedia.org/wiki/List_of_Motorola_products#C_series_(1998-2006)}
+\bibitem{last-android-6-update}
+  \url{https://en.wikipedia.org/wiki/Android_Marshmallow#cite_note-2}
+\bibitem{porting-to-android-11}
+  \url{https://redmine.replicant.us/projects/replicant/wiki/PortingToAndroid11}
+\end{thebibliography}
+\end{document}
diff --git a/LibrePlanet2022/images/African_American_worker_Richmond_Shipyards.jpg b/LibrePlanet2022/images/African_American_worker_Richmond_Shipyards.jpg
new file mode 100644
index 0000000..9293799
--- /dev/null
+++ b/LibrePlanet2022/images/African_American_worker_Richmond_Shipyards.jpg
diff --git a/LibrePlanet2022/images/Android_Robot_Cleaner_2014-2019.svg b/LibrePlanet2022/images/Android_Robot_Cleaner_2014-2019.svg
new file mode 100644
index 0000000..4edab85
--- /dev/null
+++ b/LibrePlanet2022/images/Android_Robot_Cleaner_2014-2019.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 74 88">
+	<path fill="#a4c639" d="m21.481,0.65239,4.062,7.0627c-7.394,3.6269-12.406,10.728-12.406,18.875h23.656,23.656c0-8.1468-5.012-15.248-12.406-18.875l4.063-7.0626s0.19231-0.37509-0.17225-0.58569c-0.365-0.21059-0.61,0.14869-0.61,0.14869l-4.125,7.1248c-3.141-1.3979-6.6721-2.1875-10.406-2.1875-3.7341,0-7.2653,0.7896-10.406,2.1875l-4.125-7.1248s-0.23006-0.35939-0.59737-0.14971c-0.368,0.20967-0.184,0.58671-0.184,0.58671zm4.062,13.68c1.2395,0,2.25,1.0105,2.25,2.25-0.00001,1.2395-1.0105,2.2188-2.25,2.2188s-2.25-0.97928-2.25-2.2188,1.0105-2.25,2.25-2.25zm22.5,0c1.2395,0,2.25,1.0105,2.25,2.25-0.00001,1.2395-1.0105,2.2188-2.25,2.2188s-2.25-0.97928-2.25-2.2188,1.0105-2.25,2.25-2.25z"/>
+	<path d="m12.947,29.344,0,35.893c0,1.7807,2.1523,4.1116,3.933,4.1116h5.6295v12.237c0,3.1162,2.2691,5.625,5.0938,5.625,2.8246,0,5.0938-2.5088,5.0938-5.625v-12.237h8.1875v12.237c0,3.1162,2.2691,5.625,5.0938,5.625,2.8246,0,5.125-2.5088,5.125-5.625v-12.237h5.5982c1.7807,0,3.933-2.3309,3.933-4.1116v-35.893h-47.688z" fill="#a4c639"/>
+	<rect ry="5.625" height="32.545" width="10.197" y="28.593" x="0" fill="#a4c639"/>
+	<rect rx="5.625" height="32.545" width="10.197" y="28.593" x="63.39" fill="#a4c639"/>
+</svg>
\ No newline at end of file
diff --git a/LibrePlanet2022/images/Freedo_improved.svg b/LibrePlanet2022/images/Freedo_improved.svg
new file mode 100644
index 0000000..0b39281
--- /dev/null
+++ b/LibrePlanet2022/images/Freedo_improved.svg
@@ -0,0 +1,561 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<!-- SPDX-License-Identifier: GFDL-1.3-or-later -->
+<!--
+Freedo - The mascot of Linux-libre
+
+The Freedo character originally started off as a draft from Burnaron
+[0], who later shared a vectorized version [1].
+
+A cleaned up version was developed by Rubén Rodríguez Pérez [2].
+It can also be found at [3] licensed under the GNU Free Documentation
+License (GFDL) version 1.2 or any later version. Rubén confirmed this 
+at [4] and [5].
+
+Burnaron's version came to be called Freetz [6], with the cleaned up
+version being called Freedo [7].
+
+Islene Calciolari Garcia and Alexandre Oliva made further changes to 
+Freedo by adding nostrils, opening the eyes, and changing the brush 
+color [8].
+
+Their modified version of Freedo can be found at [9] combined
+with the GNU head and licensed under the GFDL 1.2 or any later 
+version, as required by [10].
+
+Since Burnaron's draft didn't include any license terms I contacted 
+Burnaron via email and received permission to use the GFDL version 
+1.3 or any later version. This makes for consistent licensing from 
+Burnaron's draft through Rubén's cleaned up version to the modified 
+version made by Islene Calciolari Garcia and Alexandre Oliva.
+
+Therefore:
+
+Permission is granted to copy, distribute and/or modify Freedo 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.
+
+Freedo is, however, also a trademark for GNU Linux-libre [11].
+
+[0] http://www.fsfla.org/pipermail/linux-libre/2009-March/000453.html
+[1] http://www.fsfla.org/pipermail/linux-libre/2009-March/000464.html
+[2] http://www.fsfla.org/pipermail/linux-libre/2009-April/000541.html
+[3] https://commons.wikimedia.org/wiki/File:Freedo.svg
+[4] http://www.fsfla.org/pipermail/linux-libre/2009-December/000923.html
+[5] http://www.fsfla.org/pipermail/linux-libre/2010-April/001133.html
+[6] http://www.fsfla.org/pipermail/linux-libre/2009-April/000533.html
+[7] http://www.fsfla.org/pipermail/linux-libre/2009-May/000621.html
+[8] http://www.fsfla.org/pipermail/linux-libre/2009-May/000644.html
+[9] https://commons.wikimedia.org/wiki/File:Freedo_con_GNU.svg
+[10] https://www.gnu.org/graphics/heckert_gnu.en.html
+[11] http://www.fsfla.org/ikiwiki/selibre/linux-libre/
+-->
+<!--
+                GNU Free Documentation License
+                 Version 1.3, 3 November 2008
+
+
+ Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
+     <https://fsf.org/>
+ 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
+https://www.gnu.org/licenses/.
+
+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.
+-->
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