All code (except from API's etc.) are open without any restriction into the public domain under the CC0 1.0 license (http://creativecommons.org/publicdomain/zero/1.0/legalcode) FAQ (https://wiki.creativecommons.org/CC0_FAQ). Use the code at your own will to develop and create awesome mods and don't forget I make tutorials on my YouTube channel: http://youtube.com/cjminecraft