EA also had an inter partes review pending against the '575 patent. In view of the Federal Circuit's decision, White Knuckle informed the USPTO that they disclaimed every claim of the patent. As a result, the USPTO terminated the IPR proceedings on May 12. (IPR2016-00634).
Ineligible subject matter remains one of the most frequent attacks on patent validity. The lines have become more clear since Alice v CLS Bank in 2014, but it is still very difficult to predict whether any particular patent claim directed to software features will survive. White Knuckle's '575 patent did not.