\documentclass{scrbook}
\usepackage[french]{babel}

\usepackage{fontspec}
\setmainfont{Old Standard}
\addtokomafont{disposition}{\rmfamily}

\usepackage{csquotes}
\usepackage{etoolbox}
\usepackage{tikz}
\usepackage[breakable, skins, listings, xparse]{tcolorbox}

\usepackage{hyperref}
\hypersetup{unicode,colorlinks}
\usepackage{hyperxmp}
\usepackage{uri}
\usepackage[type={CC}, modifier={by-sa}, version ={3.0}]{doclicense}
\author{Robert Alessi}
\lowertitleback{\footnotesize\textcopyright{} 2018 Robert Alessi
  \mailto[courses]{robert.alessi@cnrs.fr}
  \doclicenseThis}