/usr/share/icons/oxy-brown/index.theme is in oxygen-cursor-theme-extra 0.0.2010-05-10-kde4.4.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Icon Theme]
Name = Oxygen Brown
Comment = Oxygen mouse theme. Oxygenize your desktop!
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