DIFF Subgroup
H04N 21/2223 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 ) > Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof > Server components or server architectures > Secondary servers, e.g. proxy server, cable television Head-end