DOWNLOADABLE CONDITIONAL ACCESS SYSTEM COMPATIBLE WITH A JAVA BASED CONDITIONAL ACCESS HOST CAPABLE OF INCREASING COMPATIBILITY BETWEEN A HEADEND SYSTEM AND THE HOST IN AN XCAS BASED CONDITIONAL ACCESS SYSTEM AND A COMPATIBLE METHOD THEREOF

摘要

PURPOSE: A downloadable conditional access system compatible with a java based conditional access host and a compatible method thereof are provided to reconfigure a software image and transmit the reconfigured software image to the host. CONSTITUTION: A java based conditional access host(300) receives java application based conditional access software of a preset type. The host performs a conditional access by loading the conditional access software. A head end system(100) signs a downloadable conditional access system software image so that a boot loader(311) of the host recognizes the conditional access software. The head end system transmits the software image to the host after a hardware ID of the host is applied.