Are we free to modify the included materials?

Development Rendering
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1

I want to modify some of the materials that are included in the base editor for my own use. Am I allowed to do so, or do I need to make my own?

2

I know that this is not an exact answer to your question but you are even allowed to ship games with the provided content (look here).

3

That sums it up well enough for me. Thanks for the link!