You have to go pretty far back, it was in the Visual C++ 6.0 EULA, for instance (for lack of a better link): https://proact.eu/wp-content/uploads/2020/07/Visua

You have to go pretty far back, it was in the Visual C++ 6.0 EULA, for instance (for lack of a better link): https://proact.eu/wp-content/uploads/2020/07/Visual-Basic-Enterprise_6.0_English_11762fc4-f3b9-4bf5-a513-b4a9b76b4f60.pdf https://proact.eu/wp-content/uploads/2020/07/Visual-Basic-En... It wasn't a blanket prohibition, but a restriction on some parts of the documentation and redistributable components. Definitely was weird to see that in the EULA for a toolchain. This was removed later on, though I forget if it's because they changed their mind or removed the components.