These drawings were made by Karen Rustad Tölva and are published on https://rustacean.net/. They are archived here in this repository because of their importance to the Rust community.
Quoting the footnote on https://rustacean.net/:
To the extent possible under law, Karen Rustad Tölva has waived all copyright and related or neighboring rights to Ferris the Rustacean. This work is published from: United States.