Abstract: An embodiment of the invention describes a method for detecting tampering with copy restrictions on a media playback device that includes identifying locations within playback application executable files on a playback device that contain instructions for application programming interface (API) calls, modifying the API call locations to insert pieces of tamper detection code, where the pieces of tamper detection code when executed collects monitoring data about characteristics of the playback device and content being played, collecting monitoring data when API calls are performed by the API call locations, generating a confidence level of tampering from the collected monitoring data, and performing a remediation action in response to the confidence level exceeding a predetermined threshold, where the predetermined threshold is set based on types of monitoring data that was collected.

Abstract: Systems and methods for authenticating communications using a single message exchange and symmetric key in accordance with embodiments of the invention are disclosed.