All code (excluding the bundled APIs from other mods, which are covered by their respective licenses) are released without restriction into the public domain under the CC0 1.0 licence (http://creativecommons.org/publicdomain/zero/1.0/legalcode) FAQ (https://wiki.creativecommons.org/CC0_FAQ).
Do what you want with it, as long as you smile while doing so.
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Documentation is found in the https://github.com/HenryLoenwind/EnderIOAddons/wiki