Truth be told, we had mixed feelings about this. To address the convenience issue, a number of community members went out of their way and provided GitHub repositories with the disassembled code.

But there are two obvious disadvantages to disassembling: 1) while not hard to do, it's still rather inconvenient, and 2) the disassembled output doesn't give you the original comments and variable names, frustrating attempts to understand the code. NET assemblies, and our terms of service explicitly permits doing so, for the purpose of understanding or improving your projects made with Unity. You can check out the reference source code repository here.It's always been possible to disassemble the Unity. One of the main motivations for the move was that developers had already been providing GitHub repositories with disassembled code, which is technically against Unity’s terms of service and not legal. He noted that Unity did not have the organisational framework to handle these requests and that any requests were still against the licence terms.

Pranckevičius added Unity is not taking pull requests against the reference source code. By looking at each commit you can see what has changed between successive version.” “Going forward, the repository will be updated shortly after every new release. “C# source of everything that goes into UnityEngine and UnityEditor managed assemblies, for every single version going back to Unity 2017.1,” said Unity's Aras Pranckevičius The C# reference source code has been release under read-only terms rather than for modification. The technology firm stressed it was not releasing Unity as open source and that the main engine will remain proprietary for the foreseeable future. In a surprise move Unity has published the engine and editor C# source code on GitHub under a reference-only licence.

Source code unity