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My thought about this are that "Space Marine" is general term and it should be used in every book, story or whatever. The copyrighted term for GW is "Adeptus Astartes" and it is really unique for 40k.
Space Marine is general term for combat infantry in space : "The space marine, an archetype of science fiction, is a Marine that operates in outer space or on alien worlds". By this logic the decedents of Bob Olsen should sue GW because he was the first one to use that word in book back in 1932 ( "Captain Brink of the Space Marines" ).

What is more amusing is that general term "Marine" in US is under USMC copyright.

http://www.hqmc.marines.mil/divpa/Units/MarineCorpsTrademarkLicensingProgram.aspx

They even had several Space Marines of their own:

http://en.wikipedia.org/wiki/List_of_United_States_Marine_Corps_astronauts

So what's next? GW suing US military for copyright?

This was really stupid move from their side... so what if she used "Space Marine" in her book? That word is used all over sci-fi, not just 40k.

And general term "Space Marine" is already connected with Adeptus Astartes a LOT, type "Space Marine" in Google search and I can guarantee you that first 3 or 5 pages will be just about them. This move could only hurt their already bad publicity with people.

If they want to repair the damage all they have to do is publicly apologize to the author and put her book back to the Amazon. But seeing how she will then have right to sue them and get a LOT of money from them that is not going to happened.