% \usepackage{ocg-p}
 
\begin{ocg}[printocg=never]{SaveAsButton}{SaveAsButtonID}{1}
% content...
\Acrobatmenu{SaveAs}{\fcolorbox{black}{yellow}{PDF-Dokument speichern}} 
\end{ocg}

in scrlettr2

%------------------------------------------------------------
\documentclass[copy]{scrlettr2}
%------------------------------------------------------------

%------------------------------------------------------------
\usepackage{eurosym}
 
\usepackage[utf8]{inputenc}
 
\DeclareUnicodeCharacter{20AC}{\euro}
%------------------------------------------------------------

%------------------------------------------------------------
\DTLifstringeq{\sex}{w}%
{Ihre Tochter}%
{Ihr Sohn}
%------------------------------------------------------------

%------------------------------------------------------------
\usepackage{navigator}
\embeddedfile{sourcecode}{\jobname.tex}
%------------------------------------------------------------

%------------------------------------------------------------
\usepackage{draftwatermark}
\SetWatermarkText{ENTWURF}
\SetWatermarkLightness{0.8}
\SetWatermarkScale{4}
%------------------------------------------------------------

%------------------------------------------------------------
 
\makeatletter % We need to access some internal commands
\newcommand*{\IfDataT}[1]{% Create a macro taking one argument
  \ifx#1\empty
    \expandafter\@gobble % Empty input: ignore the next thing
  \else
    \ifx#1\DTLstringnull
      \expandafter\expandafter\expandafter
        \@gobble % NULL input: ignore the next thing
    \else
      \expandafter\expandafter\expandafter
        \@firstofone % Use the next thing unchanged
    \fi
  \fi
} 
\newcommand*{\IfDataTF}[1]{% Create a macro taking one argument
  \ifx#1\empty
    \expandafter\@secondoftwo % Empty value: use the False branch
  \else
    \ifx#1\DTLstringnull
      \expandafter\expandafter\expandafter
        \@secondoftwo % NULL value: use the False branch
    \else
      \expandafter\expandafter\expandafter
        \@firstoftwo % A real value: use the True branch
    \fi
  \fi
} 
\makeatother
%------------------------------------------------------------

%% ---------------------------------------
\usepackage{tikz}
\newcommand{\karos}[2]{
  \begin{tikzpicture}
    \draw[xstep=0.4cm,ystep=0.4cm,color=lightgray] (0,0) grid (#1,#2);
  \end{tikzpicture}}
%----------------------------------------------------------------