Not copyrighted, there was a trademark on it.The two are very different things.
"VeRy DiFfErEnT
The main difference is that a trademark protects the unique identification of a brand or product (e.g. the logo of a brand) and must be applied for, whereas copyright prevents copying, reproduction, or distribution of specific work
But yomi means underworld in japanese, isn't it forbidden to copyright (or trademark or whatever) words?
