Patent classifications
H
ELECTRICITY
Load children
H04
ELECTRIC COMMUNICATION TECHNIQUE
Load children
H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
Load children
H04N7/16
Analogue secrecy systems; Analogue subscription systems
Load children Filter patents View analytics View as hierarchy
H04N7/162
Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
Load children Filter patents View analytics View as hierarchy
H04N7/165
Centralised control of user terminal; ; Registering at central
Filter patents View analytics View as hierarchy