body: When an author invents a new term such as Mithril or Orc in Lord of The Rings or Redstone in Minecraft, are there restrictions on the use of those terms? 
  
  
  If I write my own book or create a video game would it be an infringement to use Mithril or Redstone as a fictitious item? 
  
  
  If so what are those limitations? If my redstone was actually a blue liquid that explodes instead of a red powder that conducts electricity would that be different?
  
  
  
title: Are invented names protected by copyright?