METHOD OF SENDING AN EXECUTABLE CODE TO A RECEPTION DEVICE AND METHOD OF EXECUTING THIS CODE

摘要

#CMT# #/CMT# The method involves repeating sending a message with one extended block (1) distinct from an extended block (2), processing of the message, storing executable and management codes of the block (2) in an executable zone of a memory, and executing of the management code, until all extended blocks (1-4) are stored in the memory except in the block (2). An entitlement management message with the block (2) is sent to the device. The management message is processed to extract the block (2). The executable code of the block (2) is stored in a non-executable zone of the memory. #CMT#USE : #/CMT# Method for sending an executable code, which is utilized for accessing conditional access data, to a security module locally connected to a reception device e.g. set top box, in a conditional access TV, for executing the executable code (claimed). #CMT#ADVANTAGE : #/CMT# The method permits the maximum size of executable program to be independent of size of an executable memory, and permits the maximum size to be dependent on the executable zone and the non-executable zone of the memory, thus presenting the memory with a large size for permitting utilization of huge amount of executable codes, while limiting size of the executable zone of the memory, and hence ensuring an improved security and reducing risks of intentional harmful person from accessing secrete information contained in the memory. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view illustrating a state of a memory during a step in sending a code to be executed. 1-4 : Extended blocks.