Source code. More information can be found on the [mod's forum post](http://www.minecraftforum.net/topic/1361286-164-mekanism-557-universal-cable-dynamic-tanks-wind-power/).
Some people really don't like others to review or distribute their mods, something which I honestly don't understand. You are the ones who help get this mod into the Minecraft community's hands, which seems like a good thing from my perspective.
So go ahead, do whatever you like. I honestly just don't want you messaging me on IRC or on the forums, asking my permission. If you need proof, provide a link to this page, or give them information on the MIT license.
Licenses are not really my friend -- strict closed source software really drives me nuts. Even more, with a derivative work coded in a language such as Java, nothing can really prevent people from looking through my source with JD-GUI.
However, I welcome people wanting to learn how to mod, and because of this, I have licensed Mekanism under the MIT License, which doesn't include many guidelines. This basically means you have the right to use my mod's source code, learn
from it, and even use it in your own mod. You even have the right to distribute this mod to the public and make money off of it, although this is something I wouldn't necessarily encourage! :)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.