✏ EDIT: caption.ps

%!
% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% Add a "caption" to the bottom of each page.
/captionsize 20 def
/caption
 { /Helvetica //captionsize selectfont
   (Printed by Artifex's XXYYZZ) show
   /Symbol //captionsize selectfont
   (\324) show		% trademarkserif
   /Helvetica //captionsize selectfont
   ( product) show
 } bind def

10 dict begin
gsave
  initgraphics
  clippath pathbbox
  pop exch 36 add /by exch def
                % We can't use stringwidth, so we have to show and measure.
  gsave
    0 0 0 0 rectclip
    0 0 moveto caption currentpoint pop /bw exch def
  grestore
  add bw sub 2 div /bx exch def
                % We don't have the font bbox available, so we guess.
  /bh captionsize 1.05 mul def
grestore
/showcaption
 { gsave
     initgraphics
     //bx 9 sub //by 9 sub //bw 18 add //bh 18 add
     1 setgray 4 copy rectfill 0 setgray 1.5 setlinewidth rectstroke
     //bx //by moveto //caption exec
   grestore
 } bind def
<< /EndPage [
   %%
   %% Only print the caption if 'reason' is not 2 (device deactivation)
   %%
   /dup load /exec load 2 /ne load /exec load [ /showcaption load /exec load ] cvx /if load /exec load
   currentpagedevice /EndPage get /exec load
   ] cvx
>> setpagedevice
end

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