\usepackage{bibtopic}

% btPrintAll redefined to not include a file

\newenvironment{bibgroup}{%
    \ifthenelse{\boolean{bt@inside@sect}}{%
        \protected@edef\bt@curr@line{\the\inputlineno}%
        \def\bt@curr@cmd{\string\btPrintAll}%
        \bt@stepcnt\bt@internal@sect@cnt
        \bt@print@citedfalse\bt@print@alltrue
        \label{Sec:\bt@internal@sect@cnt}%
        \bt@change@bibitem
    }{%
        \bt@sect@err{btSect}{\btPrintAll}%
    }%
}{
    \ifthenelse{\boolean{bt@inside@sect}}{%
        \bt@print@keyvals{\bt@sect@ref@list}%
            {Sec:\bt@internal@sect@cnt}%
    }{%
    }%
}