Blizzard Entertainment is facing a class action lawsuit over the sale of its Battle.net authenticators, which are used to provide security for player account information for games such as World of Warcraft and Diablo 3. The suit, filed by the law firm Carney Williams Bates Pulliam & Bowman, PLLC in the Central District of California, alleged that the authenticators were needed by players "in order to have even minimal protection for their sensitive personal, private, and financial data." The lawsuit referred to an August security breach in which no financial user data was reported to be stolen.

The class action suit posited that Blizzard practiced "deceptive upselling," in that it allegedly failed "to disclose to consumers that additional products must be acquired after buying the games in order to ensure the security of information stored in online accounts that are requisites for playing."

A Blizzard representative told Forbes that "this suit is without merit and filled with patently false information, and we will vigorously defend ourselves through the appropriate legal channels." The representative said the use of the authenticator tool was optional for players, and offered players "an added level of security against account-theft attempts that stem from sources such as phishing attacks, viruses packaged with seemingly harmless file downloads, and websites embedded with malicious code."

Blizzard's statement continued, "the suit's claim that we didn't properly notify players regarding the August 2012 security breach is not true. Not only did Blizzard act quickly to provide information to the public about the situation, we explained the actions we were taking and let players know how the incident affected them, including the fact that no names, credit card numbers, or other sensitive financial information was disclosed."