The lawsuit did not name the rival company, but Electronic Arts Inc. is based in Northern California's Redwood City and is thought to be who Activision is referring to in its filing. Asked whether this was the case, EA spokesman Jeff Brown said, "We don't have the time to comment on the many lawsuits Activision files against its employees and creative partners."
from
http://latimesblogs.latimes.com/entertainmentnewsbuzz/2010/04/activision-fires-back-at-former-call-of-duty-developers-calling-them-self-serving-schemers.html on the Activision-Blizzard/Infinty Ward suit.