CPC Subgroup
H04N 21/418 External card to be used in combination with the client device, e.g. for conditional access
Full Title
Selective content distribution, e.g. interactive television or video on demand [VOD] (real-time bi-directional transmission of motion video data H04N7/14 ) > Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof > Structure of client; Structure of client peripherals > External card to be used in combination with the client device, e.g. for conditional access
5 direct subcodes
Child Classifications
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- H04N 21/4185 for payment