itch.io

Does that mean CC0 (public domain)?
I have to include a license file for every 3rd party content in my submission, and the license needs to be one that's widely accepted for the content type. 
If there's no license file included in the bundle, and you say that the content is CC0, would you allow me to add a license file with the framed text from the CC0 link above?

Love the sound! But what's the license?
The license is very important pre-sales info for anyone except "don't care" hobbyists. ;)