>>10
It is a derivative work of the original SICP, as far as I can tell the Sussman is credited only for the original, but not the JavaScript parts: https://sicp.sourceacademy.org/index.html
The license is puzzling. The original SICP is available under CC-BY-SA, but this is licensed CC-BY-NC-SA. Does that mean that the copyright holder (MIT Press?) allowed them to re-license it, or can you just put NC on CC-BY-SA? Doesn't NC cause problems in educational contexts, e.g. you can't use it for tutoring if you are paid to tutor?