this post was submitted on 22 Dec 2023
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UE isn't open source afaik
UE is open source as in the source code is available to anyone. But the license isn’t very open.
https://www.unrealengine.com/en-US/ue-on-github
Right, but it's best to call that "source available" so the pedants don't crucify you 🙄
Yes there is indeed a difference, but for us it makes little to no difference. In the end what matters is that we have it without having to reverse engineer it, which is a slow and laborious process (even when you do it with dirty methods).
I knew I was gonna get this answer but still couldn't be bothered to check the correct term so that's on me.
I think you're technically right because the EULA specifies that you basically can't use that code (or a modified version) outside of a licensed UE project, but outside of that it basically is. All the code can be read, the engine and/or its editor and all related tools can be compiled from the source, and you can make pull requests on the official repo.
IIRC it is not actually open source because you can't modify and/or repackage it without epic having their say in it (I think one of the licenses tiers is basically you agreeing to pay upfront + royalties for the authorization to modify the engine's code and ship the packaged version with the project)
It's called "source available"
A thanks for explaining. I didn't know that.