The license of this repo is CC-BY-NC-SA-4.0. A human readable summary of the license is available here, while the license is here. The rationale for non-commercial use is that if someone used these works to create a competing implementation (i.e. another implementation of sharding in Javascript), then that would not be good for this project. However, use of these works for commercial use may be negotiated and granted on a case-by-case basis.