Watermark using background package in beamer

Question

Is it possible? Doesn't work for me with the following code:

\documentclass{beamer}
\usepackage{lipsum}

\usepackage{background}
\backgroundsetup{
    placement=center,
    scale=1,
    contents={DRAFT}
}

\begin{document}
\frame{\lipsum[1]}
\end{document}

Answer 1

You don't have to do anything special, nor to quit using the background package; due to the way frames are built in beamer, you simply have to add the background material to the appropriate template:

\setbeamertemplate{background}{\BgMaterial}

this is exactly what the \BgMaterial command was designed for. A little complete example:

\documentclass{beamer}
\usepackage{lipsum}

\usepackage{background}
\backgroundsetup{
    placement=center,
    scale=4,
    contents={DRAFT},
    opacity=1
}
\setbeamertemplate{background}{\BgMaterial}

\begin{document}
\frame{\lipsum[1]}
\end{document}

Answer 2

It is better to use beamers facilities for this job. The text can be placed with the help of tikz. Remember that this needs 2-3 compilation runs to settle down since we are using remember picture option.

\documentclass{beamer}
\usepackage{lipsum}

\usepackage{tikz}
\setbeamertemplate{background}{%
\begin{tikzpicture}[overlay,remember picture]
\node[anchor=north west,scale=3] at ([shift={(1in,-1in)}]current page.north west) {Draft};
\end{tikzpicture}%
}

\begin{document}
\frame{\lipsum[1]}
\end{document}