/usr/share/applications/screensavers/glblur.desktop is in xscreensaver-gl 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=GLBlur
Exec=/usr/lib/xscreensaver/glblur -root
TryExec=/usr/lib/xscreensaver/glblur
Comment=This draws a box and a few line segments, and generates a radial blur outward from it. This creates flowing field effects. This is done by rendering the scene into a small texture, then repeatedly rendering increasingly-enlarged and increasingly-transparent versions of that texture onto the frame buffer. As such, it's quite GPU-intensive: if you don't have a very good graphics card, it will hurt your machine bad. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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