As the remediation costs, customer impacts, and reputational damage of a data breach continue to skyrocket, the security industry must find new ways to prevent the exfiltration of proprietary data by cybercriminals and other malicious actors. This report is a call to action for developing more automated threat response processes and a set of cyber rules of engagement. Doing so will empower security professionals to act more quickly and aggressively and stop data breaches before they impact the business. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.