Is is possible to use \usepackage{draftwatermark}
with beamer? I tried it, and the watermark does not show on the slides:
\documentclass{beamer}
\usepackage{draftwatermark}
\author{Test}
\title{Sample document for the draftwatermark package}
\begin{document}
\maketitle
\begin{frame}{Test}
test frame
\end{frame}
\end{document}
Best Answer
You should make the canvas transparent: