Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
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21/00
Selective content distribution, e.g. interactive television or video on demand [VOD]
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H04N21/40
Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
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H04N21/472
End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
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H04N21/47211
for requesting pay-per-view content
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