The graphics for the Glowforge Catan Game have been expressly stated as free-to-use.
There are many places where this is discussed, but @dan had a good statement on it in at least this post (his is the third post):
Beyond that, I have modified (sometimes heavily) every single one of the designs so that they fit the use that I want. I have no desire to fall on the wrong side of the law, and we have been told that we have full use of these sets of graphics for our own Catan Board building. If that doesn’t protect us, please let me know.