Games Workshop? You are dumb. Assuming this is true. I am really tired of overly-obvious patents, copyrights...and really, you have NO grounds for claiming ownership of the term "space marine". It's generic. Apparently, this has been going on for a while with toys and games...but now they're going after science fiction writers.
I have confirmed that they somehow have managed to register "Space Marine" as a trademark - despite the term predating the establishment of their company.
Here are a few more ridiculous terms they've somehow been allowed to trademark:
Black Flame, Blood Angels, Citadel, Dark Angels, Codex, Dark Future, Fire Warrior, Inferno, Inquisitor, Talisman.
Look how generic those are. I've talked about ridiculous patents before. Looks like we'll have to do some talking, at the very least, about ridiculous trademarks. Seriously? You can't own the words "citadel" and "inferno". (Admittedly, it's context dependent, but still).
Embarrassingly, their headquarters is in my home town.