The row started in December 2012 when US writer Maggie Hogarth found out that her novel called "Spots the Space Marine" had been removed from the Amazon ebook store following a complaint from Games Workshop.
In emails sent to Ms Hogarth this week, Games Workshop claims that its entry into digital publishing gives it a "common law trademark claim" over the phrase.
Ms Hogarth wrote a blogpost about the row and expressed her fear that if Games Workshop started actively pursuing its claim, science fiction could lose one of its "fundamental" ideas. Ms Hogarth said a lack of funds meant she was unable to defend herself against the claim. However, she is now in touch with the Electronic Frontier Foundation, which campaigns on digital rights, about the case.