/usr/share/applications/screensavers/glmatrix.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=GLMatrix
Exec=/usr/lib/xscreensaver/glmatrix -root
TryExec=/usr/lib/xscreensaver/glmatrix
Comment=Draws 3D dropping characters similar to what is seen in the title sequence of "The Matrix". See also "xmatrix" for a 2D rendering of the similar effect that appeared on the computer monitors actually *in* the movie. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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