I search for solutions in this order: Past Code, Unreal Source, Wiki, BUF, groups.yahoo, google, screaming at monitor. – RegularX

From Unreal Wiki, The Unreal Engine Documentation Site

This category contains images uploaded under the Creative Commons Attribution Non-Commercial Share-Alike 3.0 license, i.e. the license also used for Unreal Wiki articles.

Media in category "CC-BY-NC-SA images"

The following 6 files are in this category, out of 6 total.

AntiPortal-NoOcclusi… 12,980 bytes	AntiPortal-Occlusion… 20,804 bytes	Brushsinking-example… 43,905 bytes	Brushsinking-example… 60,535 bytes
Brushsinking-example… 57,172 bytes	DbMutator GameX-Flow… 22,420 bytes