An anonymous reader writes: A man has initiated a class-action suit against Blizzard over a product used to shore up Battle.net security. Benjamin Bell alleges that Blizzard's sale of Authenticators — devices that enable basic two-tier authentication — represents deceptive and unfair additional costs to their basic games. (Blizzard sells the optional devices for $6.50, and provides a free mobile app as an alternative.) The complaint accuses Blizzard of making $26 million in Authenticator sales. In response, Blizzard made a statement refuting some of the complaint's claims and voicing their intention to 'vigorously defend' themselves.