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diff --git a/presentations/comprehensive/move-logo.png b/presentations/comprehensive/move-logo.png
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diff --git a/presentations/comprehensive/ngi-sargasso.png b/presentations/comprehensive/ngi-sargasso.png
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diff --git a/presentations/comprehensive/sargasso.tex b/presentations/comprehensive/sargasso.tex
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+\pdfminorversion=3
+\documentclass[fleqn,xcolor={usenames,dvipsnames}]{beamer}
+\usepackage{amsmath}
+\usepackage{multimedia}
+\usepackage[utf8]{inputenc}
+\usepackage{framed,color,ragged2e}
+\usepackage[absolute,overlay]{textpos}
+\definecolor{shadecolor}{rgb}{0.8,0.8,0.8}
+\usetheme{boxes}
+\setbeamertemplate{navigation symbols}{}
+\usepackage{xcolor}
+\usepackage{tikz,eurosym}
+\usepackage[normalem]{ulem}
+\usepackage{listings}
+\usepackage{adjustbox}
+
+% CSS
+\lstdefinelanguage{CSS}{
+  basicstyle=\ttfamily\scriptsize,
+  keywords={color,background-image:,margin,padding,font,weight,display,position,top,left,right,bottom,list,style,border,size,white,space,min,width, transition:, transform:, transition-property, transition-duration, transition-timing-function},
+  sensitive=true,
+  morecomment=[l]{//},
+  morecomment=[s]{/*}{*/},
+  morestring=[b]',
+  morestring=[b]",
+  alsoletter={:},
+  alsodigit={-}
+}
+
+% JavaScript
+\lstdefinelanguage{JavaScript}{
+  basicstyle=\ttfamily\scriptsize,
+  morekeywords={typeof, new, true, false, catch, function, return, null, catch, switch, var, if, in, while, do, else, case, break},
+  morecomment=[s]{/*}{*/},
+  morecomment=[l]//,
+  morestring=[b]",
+  morestring=[b]'
+}
+
+\lstdefinelanguage{HTML5}{
+  basicstyle=\ttfamily\scriptsize,
+  language=html,
+  sensitive=true,
+  alsoletter={<>=-},
+  morecomment=[s]{<!-}{-->},
+  tag=[s],
+  otherkeywords={
+  % General
+  >,
+  % Standard tags
+	<!DOCTYPE,
+  </html, <html, <head, <title, </title, <style, </style, <link, </head, <meta, />,
+	% body
+	</body, <body,
+	% Divs
+	</div, <div, </div>,
+	% Paragraphs
+	</p, <p, </p>,
+	% scripts
+	</script, <script,
+  % More tags...
+  <canvas, /canvas>, <svg, <rect, <animateTransform, </rect>, </svg>, <video, <source, <iframe, </iframe>, </video>, <image, </image>
+  },
+  ndkeywords={
+  % General
+  =,
+  % HTML attributes
+  charset=, src=, id=, width=, height=, style=, type=, rel=, href=,
+  % SVG attributes
+  fill=, attributeName=, begin=, dur=, from=, to=, poster=, controls=, x=, y=, repeatCount=, xlink:href=,
+  % CSS properties
+  margin:, padding:, background-image:, border:, top:, left:, position:, width:, height:,
+	% CSS3 properties
+  transform:, -moz-transform:, -webkit-transform:,
+  animation:, -webkit-animation:,
+  transition:,  transition-duration:, transition-property:, transition-timing-function:,
+  }
+}
+
+\lstdefinelanguage{JavaScript}{
+  basicstyle=\ttfamily\scriptsize,
+  keywords={typeof, new, true, false, catch, function, return, null, catch, switch, var, if, in, while, do, else, case, break, for},
+  keywordstyle=\color{blue}\bfseries,
+  ndkeywords={class, export, boolean, throw, implements, import, this},
+  ndkeywordstyle=\color{darkgray}\bfseries,
+  identifierstyle=\color{black},
+  sensitive=false,
+  comment=[l]{//},
+  morecomment=[s]{/*}{*/},
+  commentstyle=\color{purple}\ttfamily,
+  stringstyle=\color{red}\ttfamily,
+  morestring=[b]',
+  morestring=[b]"
+}
+
+\usetikzlibrary{shapes,arrows}
+\usetikzlibrary{positioning}
+\usetikzlibrary{calc}
+
+\title{Oral Information Management for Digital Cash}
+%\subtitle{}
+
+\setbeamertemplate{navigation symbols}{\includegraphics[width=0.4cm]{ashoka.png} \includegraphics[width=1.75cm]{move-logo.pdf} \includegraphics[width=0.4cm]{gnu.png} \includegraphics[width=1cm]{taler-logo-2021-inkscape.pdf} \hfill}
+%\setbeamercovered{transparent=1}
+
+\author[C. Grothoff]{J. Burdges, F. Dold, {\bf C. Grothoff}, M. Stanisci}
+\date{\today}
+\institute{The GNU Project}
+
+
+\begin{document}
+
+\justifying
+
+\begin{frame}
+  \begin{center}
+    Oral Information Management for GNU Taler
+  \end{center}
+
+\begin{minipage}{4cm}
+\begin{center}
+\includegraphics[width=4cm]{move-logo.pdf}
+
+Brett Matthews
+
+David Myhre
+\end{center}
+\end{minipage}
+\hfill {\large \&} \hfill
+\begin{minipage}{4cm}
+\begin{center}
+{\Huge GNU} \includegraphics[width=1.5cm]{taler-logo-2021-inkscape.pdf}
+
+Christian Grothoff
+
+Marc Stibane
+\end{center}
+\end{minipage}
+
+\begin{center}
+\includegraphics[width=4cm]{ngi-sargasso.png}
+\end{center}
+
+\end{frame}
+
+
+\section{What is GNU Taler?}
+\begin{frame}{What is GNU Taler?}
+  \begin{center}
+Taler is an electronic instant payment system.
+  \end{center}
+  \begin{itemize}
+  \item Uses electronic coins stored in {\bf wallets} on customer's device
+  \item Implements {\bf digital cash}
+  \item Pay in {\bf existing currencies} (i.e. EUR, USD, BTC), \\
+    or use it to create new {\bf regional currencies}
+  \end{itemize}
+  \vfill
+  \pause
+ \noindent
+ However, Taler is
+  \begin{itemize}
+    \item \emph{not} a currency
+    \item \emph{not} a long-term store of value
+    \item \emph{not} a network or instance of a system
+    \item \emph{not} decentralized
+    \item \emph{not} based on proof-of-work or proof-of-stake
+    \item \emph{not} a speculative asset / ``get-rich-quick scheme''
+  \end{itemize}
+\end{frame}
+
+
+\begin{frame}{Design principles}
+  \framesubtitle{https://taler.net/en/principles.html}
+GNU Taler must ...
+\begin{enumerate}
+  \item {... be implemented as {\bf free software}.}
+  \item {... protect the {\bf privacy of buyers}.}
+  \item {... must enable the state to tax income and crack down on
+    illegal business activities.}
+  \item {... prevent payment fraud.}
+  \item {... be {\bf usable}.}
+  \item {... be efficient.}
+\end{enumerate}
+\end{frame}
+
+
+
+\begin{frame}
+\frametitle{Do you have any questions?}
+\vfill
+References:
+  \begin{enumerate}
+ \item{David Chaum, Christian Grothoff and Thomas Moser.
+       {\em How to issue a central bank digital currency}.
+       {\bf Swiss National Bank Working Papers}, 2021.}
+ \item{Brett Hudson Matthews.
+       {\em Hidden constraints to digital financial inclusion: the oral-literate divide}.
+       {\bf Development in Practice}, Volume 29, 2019.}
+ \item{Christian Grothoff, Bart Polot and Carlo von Loesch.
+       {\em The Internet is broken: Idealistic Ideas for Building a GNU Network}.
+       {\bf W3C/IAB Workshop on Strengthening the Internet Against Pervasive Monitoring (STRINT)}, 2014.}
+ \item{Brett Hudson Matthews.
+       {\em Oral Information Management Tools: Lighting the Path to Financial Inclusion}.
+       2014.}
+\end{enumerate}
+\end{frame}
+
+\end{document}
diff --git a/presentations/comprehensive/taler-logo-2021.png b/presentations/comprehensive/taler-logo-2021.png
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+++ b/presentations/comprehensive/taler-logo-2021.png