/usr/share/themes/Gray/CREDITS is in gray-theme 0.1-0ubuntu2.
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 | This theme is a metatheme created for Ubuntu 6.06 that comprises of the following components
Gray GTK+ theme by Cimi
http://www.gnome-look.org/content/show.php?content=34132
Candido-Selected by Cimi
http://www.gnome-look.org/content/show.php?content=37871
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