DIFF Subgroup
H04N 7/162 Full Title
Television systems (details H04N3/00, H04N5/00; methods or arrangements, for coding, decoding, compressing or decompressing digital video signals H04N19/00; selective content distribution H04N21/00) > Analogue secrecy systems; Analogue subscription systems
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.