I'd like to publish a fabric port of this mod, however since this mod has no open source license (consider adding one), I should ask for permission first.

Also, if you grant permission, what license should I use on my project?

I see no issue in that.

Permission to use the code is no longer necessary, I have already finished writing a mod without referring to your code. However I'm still asking for permission to call it "PermissionLevels-Fabric", if you don't want me to associate our mods then I'll name it something else.

It's here if anyone comes here looking for the port.