/usr/share/texmf/tex/latex/beamer/base/beamerbaseframesize.sty is in latex-beamer 3.24-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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% Copyright 2010 by Vedran Mileti\'c
% Copyright 2011 by Vedran Mileti\'c, Joseph Wright
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.
\ProvidesPackageRCS $Header: /Users/joseph/Documents/LaTeX/beamer/base/beamerbaseframesize.sty,v 70f9d8411e54 2011/09/12 18:58:34 joseph $
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