Each individual file has it's own license header.
If no license header exists, the default is:

I, 20kdc, release this into the public domain.
No warranty is provided, implied or otherwise.

License headers other than this are listed below with the specific files.

oc/occure_rc.lua:
    --[[
    To the extent possible under law, Skye has waived all copyright and related or neighboring rights to this file. This file is published from: United Kingdom. 
    --]]