The rest of that paragraph reads:
Many of the game changes were simply renaming ICE names, such as changing the world name from Kulthea to Elanthia, and renaming the deities while keeping their previous characteristics.
Renaming would be due to trademark infringement, which is also a type of intellectual property, rights to which can be granted by licence (for example the d20 System licence, which allows you to use various WotC trademarks).
It's a trademark owned by the Tolkien estate, yes, although Tolkien wasn't the first to use the name.
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