> The Licensed Technology licensed to you under this Agreement includes all Unreal Engine code and related content that is copied to your computer when you install Unreal Engine.
Have you read it? You literally get read access to their entire GitHub repo.
Yes. Having access to the source is not the same as open source. I encourage you to re-read it. They also have an FAQ clearly outlining the restrictions. https://www.unrealengine.com/en-US/faq
"Can I copy and paste Unreal engine code into my own project or engine?
If you use any Unreal Engine code in your product (even just a little), then your entire product is governed by the Unreal Engine EULA, and is subject to 5% royalties when your gross lifetime revenues from that product exceed $1 million USD."
> [...] and is subject to 5% royalties when your gross lifetime revenues from that product exceed $1 million USD.
That's part of their general license and business model anyway, and not specific for source code usage, but the engine (parts) itself. How is this relevant?
Notice that you can't even access the repo without them authorizing you to do so. Notice that there aren't any public mirrors for the current version of the code.
They say you can fork but also point out that you can't distribute the code without the people you are sharing with also having a license.
Whatever floats your boat. I am not here to get into Stallman level discussions about what is open and what is not. Point is we get to work with the sources if we want/have to, tied to a license with all its privileges ... and of course restrictions. Just like with any other open software sources.
Have you read it? You literally get read access to their entire GitHub repo.