| 摘要 |
In a method for operating a conditional access system for broadcast applications, which conditional access system comprising a number of subscribers, each subscriber having a terminal including a conditional acces s module (11) and a secure device (12) for storing entitlements, each entitlement indicating a service for which the subscriber receiving the entitlement is entitled to watch, entitlement management messages (EMM's) ar e sent to a secure device or group of secure devices. These EMM's each provide an entitlement and a corresponding expiry date, wherein the entitlements are refreshed periodically in accordance with their expiry dates by sending EMM' s updating the expiry dates. Further, a set of extension entitlement managemen t messages (extension EMM's) is sent to all secure devices, each message indicating that all entitlements having an expiry date within a predetermine d first period are extended with a predetermined second period, wherein the EMM's updating the expiry dates are sent after the extension EMM's. |
