Inquiry About Using and Modifying RUC Code

[Jerry-Liao-6174]

I came across your RUC repository on GitHub and found it incredibly valuable for my work. I’m interested in modifying the code and potentially sharing my version with a few collaborators, but I noticed that the repository does not specify a license.
Could you clarify whether the code can be used and modified publicly? If there are any restrictions or preferred attribution guidelines, I’d be happy to follow them.
Thank you for your time, and I appreciate your work!