I had the same thought. Not bashing their work I am genuinely curios.

For this specific case I was suprised to see they have a dedicated website for such questions! So I guess it is quite common.... (They seem very serious about it since i couldn't even mark the text to copy it here! )

>Tolkien’s original drawings, paintings, maps, designs, scripts and other graphic works are protected by copyright and may not be copied. The Tolkien Estate takes action against parties who try to commercialise Tolkien’s works, including maps of Middle-earth, the One Ring Inscription and other images.

[0] https://www.tolkienestate.com/frequently-asked-questions-and...