| 摘要 |
A decoder 12 in particular for a digital television system and adapted to receive a transport packet stream containing table or section data encapsulated within the packet payloads. The decoder is characterised in comprising a means 80 for filtering table or section data configurable in response to filter data received from a portable security module 30 such as a smart card. The invention equally extends to a portable security module 30 including a memory holding such data as is necessary to configure the table or section filter 80, and a method for processing a transport packet stream including encapsulated table and section data using such a decoder 12 and security module 30. In a preferred embodiment, the filter 80 is adapted to filter out conditional access messages in response to the table or section filter data received from the portable security module 30, these messages being thereafter forwarded to the security module for processing. <IMAGE> |
