Dear Bleeping Computer.
The phrase you are looking for is "Strategic Lawsuit Against Public Participation", also known as a SLAPP Suit.
You are a publicly accessible (rather than pay wall for participation) forum dedicated to Public Participation on a number of topics, and your postings about Enigma's SpyHunter fall clearly under the realm of Free Speach.
Tell your lawyer to draft up a SLAPP rebuttal to the suit & file it ASAP. The moment the Judge sees that phrase it will immediately put a serious crimp in Enigma's case, as now they will be forced to prove that they are NOT in fact attempting to Violate Your First Amendment Rights.
I am not a lawyer but I *have* used a SLAPP declaration to my defense successfully.
Good luck & here's hoping you get that utter festering shit stain at SpyHunter put out of business from the fines, penalties, & reimbursed legal fees.