draft-background.tex

\documentclass{article}
\usepackage{tikz}
\usepackage[a4paper,left=0.5cm]{geometry}
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}
\pgftransformscale{2}
\pgftransformrotate{90}
\color{gray}
\pgftext{\bfseries\sffamily DRAFT -- please do not distribute}
\end{tikzpicture}
\end{document}