How to add "DRAFT" along the left/right margin?

Compile more than 3 times.

\documentclass{article}
\usepackage{lipsum}
\usepackage{background}
\backgroundsetup{
  position=current page.east,
  angle=-90,
  nodeanchor=east,
  vshift=-5mm,
  opacity=1,
  scale=3,
  contents=Draft
}
\begin{document}
  \lipsum
\end{document}

It's easy to patch this command. Here a code

\documentclass{article}

\usepackage{draftwatermark}
%
\makeatletter
\renewcommand\sc@watermark{%
  \setlength{\@tempdimb}{.1\paperwidth}% change here as you need horiz pos
  \setlength{\@tempdimc}{-.5\paperheight}%  change vertical pos
  \put(\strip@pt\@tempdimb,\strip@pt\@tempdimc){%
    \makebox(0,0){\rotatebox{\sc@wm@angle}{%
        \scalebox{\sc@wm@scale}{%
          \expandafter\expandafter\expandafter\textcolor
          \expandafter\sc@wm@colormodel\expandafter{\sc@wm@colorspecs}{%
            \fontsize{\sc@wm@fontsize}{1.2\sc@wm@fontsize}
            \selectfont
            \sc@wm@text}}}}}}
\makeatother
% \SetWatermarkLightness{0.8}
\SetWatermarkScale{4}
\SetWatermarkAngle{90}
\usepackage{lipsum}
\begin{document}
\lipsum[1-5]
\end{document}