CityHash /Engine/Source/Programs/Shared/EpicGames.Core/ Is a high quality and fast Hashfunction that performs reasonably well across all platforms. Used as input for hash-tables to improve performance by decreasing collision rate. https://github.com/google/cityhash/blob/master/COPYING Licensees P4 Github /Engine/Source/ThirdParty/Licenses/CityHash_License.txt