This file is indexed.

/usr/share/xscreensaver/config/ccurve.xml is in xscreensaver-data-extra 5.30-1+deb8u2.

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="ccurve" _label="CCurve">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Change image every" _low-label="0 seconds" _high-label="30 seconds"
          low="0" high="30" default="3"/>

  <number id="pause" type="slider" arg="-pause %"
          _label="Animation speed" _low-label="Slow" _high-label="Fast"
          low="0.0" high="5.0" default="0.4" convert="invert"/>

  <number id="limit" type="slider" arg="-limit %"
          _label="Density" _low-label="Low" _high-label="High"
          low="3" high="300000" default="200000"/>

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

  <xscreensaver-updater />

  <_description>
Generates self-similar linear fractals, including the classic "C Curve".

http://en.wikipedia.org/wiki/Levy_C_curve

Written by Rick Campbell; 1999.
  </_description>
</screensaver>