ICU 64.1 Engine/Source/ThirdParty/ICU Provides an ICU implementation of our culture and internationalization APIs inside the Core module of UE4 https://github.com/unicode-org/icu/blob/master/icu4c/LICENSE Licensees Git P4 //UE4/Main/Engine/Source/ThirdParty/Licenses/ICU_64-1_License.txt