LifeLock Agrees to Pay $100 Million Fine in Settlement With F.T.C.

LifeLock, an identity protection service, agreed to a $100 million settlement with the Federal Trade Commission for failing to deliver on promises it would guard personal data and inform users when their information was breached.

The F.T.C. said Thursday that the size of the fine, one of the largest from the agency, reflected the egregiousness of LifeLock’s actions. The settlement is the company’s second with federal enforcement officials. In 2010, the F.T.C. charged the company with failing to provide strong security measures for personal data.