Cipher method and device for limitting inserting transfered program content

Application Number: 00108224
Application Date: 2000.04.30
Publication Number: 1273490
Publication Date: 2000.11.15
Priority Information: 1999/5/7 US 09/307,643
International: H04N7/16
Applicant(s) Name: Lucent Technologies Inc.
Address:
Inventor(s) Name: Daniell Brecherbek;Avisha Wohl
Patent Agency Code: 11038
Patent Agent: jiang shixun
Abstract A system for restricting access to transmitted programming content is disclosed, which transmits a program identifier with the encrypted programming content. A set-top terminal or similar mechanism restricts access to the transmitted multimedia information using stored decryption keys. The set-top terminal receives entitlement information periodically from the head-end, corresponding to one or more packages of programs that the customer is entitled to for a given period. Each program is encrypted by the head-end server prior to transmission, using a program key, Kp, which may be unique to the program. The set-top terminal uses the received program identifier, p, together with the stored entitlement information, to derive the decryption key necessary to decrypt the program.