H04N 21/25891 :
being end-user preferences ...
H04N 21/26291 :
for providing content or ad...
H04N 21/40 :
Client devices specifically...
H04N 21/41265 :
having a remote control dev...
H04N 21/414 :
Specialised client platform...
H04N 21/422 :
Input-only peripherals , i....
H04N 21/42203 :
sound input device, e.g. mi...
H04N 21/42204 :
User interfaces specially a...
H04N 21/42206 :
characterized by hardware d...
H04N 21/4221 :
Dedicated function buttons,...
H04N 21/42222 :
Additional components integ...
H04N 21/42225 :
characterized by types of r...
H04N 21/426 :
Internal components of the ...
H04N 21/42684 :
Client identification by a ...
H04N 21/43 :
Processing of content or ad...
H04N 21/4302 :
Content synchronisation pro...
H04N 21/4307 :
Synchronising the rendering...
H04N 21/43072 :
of multiple content streams...
H04N 21/43079 :
of additional data with con...
H04N 21/431 :
Generation of visual interf...
H04N 21/4312 :
involving specific graphica...
H04N 21/4314 :
for fitting data in a restr...
H04N 21/4316 :
for displaying supplemental...
H04N 21/432 :
Content retrieval operation...
H04N 21/433 :
Content storage operation, ...
H04N 21/4332 :
by placing content in organ...
H04N 21/435 :
Processing of additional da...
H04N 21/437 :
Interfacing the upstream pa...
H04N 21/4396 :
by muting the audio signal
H04N 21/441 :
Acquiring end-user identifi...
H04N 21/4415 :
using biometric characteris...
H04N 21/442 :
Monitoring of processes or ...
H04N 21/44204 :
Monitoring of content usage...
H04N 21/44213 :
Monitoring of end-user rela...
H04N 21/44222 :
Analytics of user selection...
H04N 21/4532 :
involving end-user characte...
H04N 21/462 :
Content or additional data ...
H04N 21/4622 :
Retrieving content or addit...
H04N 21/47 :
End-user applications
H04N 21/472 :
End-user interface for requ...
H04N 21/47202 :
for requesting content on d...
H04N 21/47205 :
for manipulating displayed ...
H04N 21/4725 :
using interactive regions o...
H04N 21/475 :
End-user interface for inpu...
H04N 21/4753 :
for user identification, e....
H04N 21/4755 :
for defining user preferenc...
H04N 21/4756 :
for rating content, e.g. sc...
H04N 21/478 :
Supplemental services, e.g....
H04N 21/4782 :
Web browsing , e.g. WebTV
H04N 21/4788 :
communicating with other us...
H04N 21/482 :
End-user interface for prog...
H04N 21/4821 :
using a grid, e.g. sorted o...
H04N 21/4823 :
using a channel name
H04N 21/4826 :
using recommendation lists,...
H04N 21/4828 :
for searching program descr...
H04N 21/485 :
End-user interface for clie...
H04N 21/4858 :
for modifying screen layout...
H04N 21/488 :
Data services, e.g. news ti...
H04N 21/4882 :
for displaying messages, e....
H04N 21/6125 :
involving transmission via ...
H04N 21/6175 :
involving transmission via ...
H04N 21/6582 :
Data stored in the client, ...
H04N 21/8126 :
involving additional data, ...
H04N 21/8133 :
specifically related to the...
H04N 21/8166 :
involving executable data, ...
H04N 21/8173 :
End-user applications, e.g....
H04N 21/8358 :
involving watermark protect...
H04N 21/84 :
Generation or processing of...
H04N 21/85 :
Assembly of content; Genera...
H04N 21/8545 :
for generating interactive ...
H04N 5/44 :
Receiver circuitry for the ...
H04N 5/445 :
for displaying additional i...
H04N 5/45 :
Picture in picture , e.g. d...
H04N 5/50 :
Tuning indicators; Automati...