The original author of the mod Iberia is Rock Hymas. Iberia, and by extension Iberia: Hardcore Alchemy Edition, is Open Source and distributed under the CC-BY-NC-SA 4.0 License, as seen here: https://github.com/rockhymas/iberia/blob/master/LICENSE.txt

This mod has been uploaded to a separate Curseforge page with permission from the original author, seen here: https://github.com/rockhymas/iberia/issues/47