The Rust and Cargo logos (bitmap and vector) are owned by the Rust Foundation and distributed under the terms of the Creative Commons Attribution license (CC-BY). This is the most permissive Creative Commons license, and allows reuse and modifications for any purpose. The restrictions are that distributors must “give appropriate credit, provide a link to the license, and indicate if changes were made.” Note that use of these logos, and the Rust and Cargo names, is also governed by trademark; our trademark policy is described below.
This license applies to images containing content from Rust, Crates.io, docs.rs, and is granted in full by link, the meaning of logos/images/pictures is kept as is (there are only minimal changes in scaling and the possible addition of a grayscale effect).
Ferris is the unofficial mascot of the Rust community. You can find more images of Ferris on rustacean.net.
(this point can be supplemented by someone at any time)