Attribution-NonCommercial 4.0 International Public License

   You are free to:
   - Share — copy and redistribute the material in any medium or format
   - Adapt — remix, transform, and build upon the material

   Under the following terms:
   - Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made.
   - NonCommercial — You may not use the material for commercial purposes.
   - No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

   Full license: https://creativecommons.org/licenses/by-nc/4.0/