this post was submitted on 26 Jan 2024
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What do you mean it’s not open source?
i have cloned their GitHub repo many times
Also no it doesn’t bring up royalties because that isn’t related to source code
Read the license. It's what we generally call "source available", but it does not qualify as open-source.
https://en.wikipedia.org/wiki/Open_source_license
https://en.wikipedia.org/wiki/Source-available
It brings up the issue of royalties because those are part of Unreal Engine's license terms.
Open source and free are different
It can be considered open source because you can sell derivative engines (there are no royalties on that btw) and push upstream
Under your source available link the inability to create derivatives is the common theme for what makes it not open source
https://opensource.org/osd/
If someone else comes along, Unreal Engine checks all of those
No, I don't believe it does. In particular, Section 4: "How You Can Share the Licensed Technology When It Isn’t Part of a Product" imposes restrictions that contradict the very first clause in the Open-Source definition: "Free Redistribution".
At a quick glance, I expect the royalty requirements fail the first clause as well, but there's no point in combing through them for this conversation, given the above.
You obviously want to believe otherwise, though, and I don't want to argue with you. Feel free to test it in court. Good luck.