Patent ID: 6219422
Filing Date: 2001-04-17
Classification: H04H,H04N

Abstract:
A transmitting apparatus for a digital broadcasting system for controlling access to scrambled programs based on a customer's most recent account information, comprising:a scrambling unit for scrambling a program using a first encryption key; said first encryption key being specific to said program and generic to a plurality of receiving apparatuses; the scrambled program requiring both said first encryption key and a second encryption key to be unscrambled;a first transmitter for transmitting the scrambled program along with the corresponding first encryption key to said plurality of receiving apparatuses; anda second transmitter for transmitting said second encryption key to a specific receiving apparatus in response to a request therefrom; said second encryption key being generic to a plurality of programs and specific to said specific receiving apparatus; said second encryption key being determined and updated periodically on the basis of said customer's present account information.