1. A method, implemented in a computing device, the method comprising: accessing a new security policy to be implemented by a plurality of security engines of the computing device and to be used by the plurality of security engines in place of a current security policy; each of the plurality of security engines processing at least a portion of the new security policy to establish new rules for operation of the security engine while the security engine continues to operate according to previous rules; and switching, after each of the plurality of security engines is ready to begin using the new security policy, each of the plurality of security engines to the new rules substantially concurrently.