For a start-up project we are launching, we are comparing several game engines that will enable us to sell our packaged service.
If we take UE4 source-code and modify it to integrate our features and functionnalities, will we be able to sell this new piece of software through a commercial license?
If so, what are the royalties we will owe to Epic Games?
Do we need a specific terms agreement for this kind of commercial-use?
The complete idea consists in selling some licenses of modified-UE4 to companies in order to let them produce smartphone applications. Basically, we are the tech-providers in this business model and thus we need our clients to edit their own content through a modified version of UE4.
Thank you in advance, and sorry about the shortness of my explanation: we have to keep everything secret as much as possible