Epic’s engine code is still copyright Epic Games. You shouldn’t change that copyright. To automatically set your own copyright in files that are part of your project, you need to have a DefaultGame.ini file in your game’s Config folder. In the DefaultGame.ini file, in the ‘[/Script/EngineSettings.GeneralProjectSettings]’ section, set the following:
CopyrightNotice=<your copyright notice here>
ProjectName=<your project name here>
CompanyName=<your company name here>
CompanyDistinguishedName=CN=<company name>
Homepage=<your website here>
ProjectDisplayedTitle=<project name displayed title here>