This file is indexed.

/usr/share/xscreensaver/config/blitspin.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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="blitspin" _label="BlitSpin">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Fuzzy rotation speed" _low-label="Slow" _high-label="Fast"
          low="1" high="800000" default="500000"
          convert="invert"/>

  <number id="delay2" type="slider" arg="-delay2 %"
          _label="90 degree rotation speed" _low-label="Slow" _high-label="Fast"
          low="1" high="800000" default="500000"
          convert="invert"/>

  <number id="duration" type="slider" arg="-duration %"
          _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
          low="10" high="600" default="120"/>

<!--  <file id="bitmap" _label="Bitmap to rotate" arg="-bitmap %"/> -->

  <xscreensaver-image />

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

  <_description>

Repeatedly rotates a bitmap by 90 degrees by using logical operations:
the bitmap is divided into quadrants, and the quadrants are shifted
clockwise.  Then the same thing is done again with progressively
smaller quadrants, except that all sub-quadrants of a given size are
rotated in parallel.  As you watch it, the image appears to dissolve
into static and then reconstitute itself, but rotated.

Written by Jamie Zawinski; 1992.
  </_description>
</screensaver>