/usr/share/applications/screensavers/lcdscrub.desktop 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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Name=LCDscrub
Exec=/usr/lib/xscreensaver/lcdscrub -root
TryExec=/usr/lib/xscreensaver/lcdscrub
Comment=This screen saver is not meant to look pretty, but rather, to repair burn-in on LCD monitors. Believe it or not, screen burn is not a thing of the past. It can happen to LCD screens pretty easily, even in this modern age. However, leaving the screen on and displaying high contrast images can often repair the damage. That's what this screen saver does. See also: http://docs.info.apple.com/article.html?artnum=88343 http://toastycode.com/blog/2008/02/05/lcd-scrub/ Inspired by the like-named program by Daniel Sandler. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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