1. A computer-implemented method comprising: providing a Flash advertisement and limiting access to sensitive data associated with the Flash advertisement, including: storing first library code for controlling playback of the Flash advertisement and second library code for accessing the sensitive data separately at two different security domains, where a first server associated with a first security domain of the two different security domain stores the first library code and additional code for accessing the second library code stored at a second different server associated with a second different security domain of the two different security domains; permitting an application at a third different security domain to access the first library code residing at the first security domain; and permitting only the additional code residing at the first security domain to access the second library code residing at the second different security domain.