The word "drow" is not copyrighted and cannot be so since its origins trace from Scots/Celt mythology.
All of the proper names created by TSR's authors, however, are copyrighted. Some could very possibly be trademarked. If they are trademarked, TSR must defend them rigorously or else the trademark becomes meaningless. Thus, you could use "drow" to be a catch-all term for dark skinned elves, since that is the picture that will be evoked for most people playing fantasy muds. You couldn't use 'Lloth' or 'Mezzowhateverthatcity'snameis'.
The stuff is still technically owned by TSR which is a subsidiary of WoTC which was bought out by Hasbro. So! It's a bit convoluted. Ultimately, Hasbro now owns the TSR licences as its parent company, but TSR holds the copyrights. (I think this is right.) Hasbro bought WoTC to get their hands on the Pokemon card game.
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