This file is indexed.

/usr/share/xscreensaver/config/blinkbox.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="blinkbox" _label="BlinkBox">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="30000"
          convert="invert"/>

  <number id="boxsize" type="slider" arg="-boxsize %"
          _label="Box size" _low-label="Small" _high-label="Large"
          low="1" high="8" default="2"/>

  <hgroup>
   <boolean id="fade"      _label="Fade"        arg-unset="-no-fade"/>
   <boolean id="blur"      _label="Motion blur" arg-unset="-no-blur"/>
   <boolean id="dissolve"  _label="Dissolve"    arg-set="-dissolve"/>
   <boolean id="wire"      _label="Wireframe"   arg-set="-wireframe"/>
  </hgroup>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
Shows a ball contained inside of a bounding box.
Colored blocks blink in when the ball hits the sides.

Written by Jeremy English; 2003.
  </_description>
</screensaver>