H
ELECTRICITY
H
ELECTRICITY
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N21/00
Selective content distribution, e.g. interactive television or video on demand [VOD]
H04N21/00
Selective content distribution, e.g. interactive television or video on demand [VOD]
H04N21/80
Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
H04N21/80
Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
H04N21/83
Generation or processing of protective or descriptive data associated with content; Content structuring
H04N21/83
Generation or processing of protective or descriptive data associated with content; Content structuring
H04N21/835
Generation of protective data, e.g. certificates
H04N21/835
Generation of protective data, e.g. certificates
H04N21/8358
involving watermark
H04N21/8358
involving watermark