CC0 1.0 Universal (public domain dedication)

The person who associated a work with this deed has dedicated the work to the
public domain by waiving all of their rights to the work worldwide under
copyright law, including all related and neighboring rights, to the extent
allowed by law. You can copy, modify, distribute and perform the work, even
for commercial purposes, all without asking permission.

Full text: https://creativecommons.org/publicdomain/zero/1.0/legalcode
