This curriculum is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
It basically means you can do whatever you want with the material as long as it's for non-commercial use but you've got to attribute the original author (Erik Trautman) and share any derivative works under the same license.
If you're interested in using the curriculum for commercial purposes or otherwise licensing material, feel free to get in touch at theodinprojectcontact@gmail.com.