Embedded Common Interface (ECI) for exchangeable CA/DRM solutions; Part 5: The Advanced Security System; Sub-part 1: ECI specific functionalities (V1.1.1)
"The present document defines a robust security processing subsystem for ECI called the Advanced Security System. The Advanced Security System provides a secure basis for software elements to be authenticated and loaded@ performs security computations and verifications@ manages the encryption and decryption of content and the exchange of content with associated rights and obligations. As such the Advanced Security System is part of a ""secure video path"" as it is referred to in contemporary specifications. The Advanced Security System applies the ECI Key Ladder Block [5] to perform secure calculations."