I'll quote a bit from her blog:
In mid-December, Games Workshop told Amazon that I’d infringed on the trademark they’ve claimed for the term “space marine” by titling my original fiction novel Spots the Space Marine. In response, Amazon blocked the e-book from sale [original post and update]. Since then, I’ve been in discussion with Games Workshop, and following their responses, with several lawyers.
To engage a lawyer to defend me from this spurious claim would cost more money than I have, certainly more than the book has ever earned me. Rather than earning money for my family, I’d be taking money from them, when previously my writing income paid for my daughter’s schooling. And I’d have to use the little time I have to write novels to fight a protracted legal battle instead.
I am (as I've previously said) not a fan of Games Workshop. This, however, takes the cake: I note with ironic amusement one of their upcoming titles is 'The Death of Integrity". No comment needed.In their last email to me, Games Workshop stated that they believe that their recent entrée into the e-book market gives them the common law trademark for the term “space marine” in all formats. If they choose to proceed on that belief, science fiction will lose a term that’s been a part of its canon since its inception. Space marines were around long before Games Workshop. But if GW has their way, in the future, no one will be able to use the term “space marine” without it referring to the space marines of the Warhammer 40K universe.
I find it, like the original author, very difficult to believe that GW invented the term 'Space Marine' any more than Lucasfilm/TSR had a right to the term 'Nazi': in fact, I've set some of my friends who are deeply steeped in Science Fiction lore and history to see just how far back they can go in a search for uses of the term.
Spread the signal.
[Note: John Scalzi has picked up on this, as has Patrick Nielsen Hayden.]