Copy-protecting applications in a digital broadcasting system

摘要

A digital broadcasting system, such as DVB-MHP, transmits applications (320) in encrypted form to terminals (60). Details about the application, such as encryption method, cost and payment details are transmitted to terminals. Terminals use an interaction channel (85) to obtain authorization to access the application (320) from an authorizing entity (55). Authorized terminals receive a key (215) which can be used to decrypt the encrypted application (320). The functionality to authorize the terminal can reside on the terminal (60) or it can form part of a launcher application (310, FIG. 5) which is received by the terminal.