Okay, so I read a post that somebody wants iCU, so I started porting it to MCPE, but then I remembered that VanishedKevin had an iCU in PocketEssentials, so now I am asking if I would get banned if I posted MY iCU?
I don't think anybody should be reproducing it. If you go to the Bukkit plugin at http://dev.bukkit.org/bukkit-plugins/icontrolu/ and look at the license, it says reproduction isn't allowed.
I think it is not a reproduction. He just licensed the software, not the idea of iCU. If he wants to patent the idea of iCU, I think he has to go through procedures like what scientists do for their inventions.
If you just write "Copyright by ......" then it won't count in a lawsuit. You need to officially register your product/code. But every person with a bit of respect don't copy someone else his code.
But a bit of respect doesn't make this idea of his be monopoly. And I don't think pocketmine plugins won't affect him at all.