A method and apparatus for the automatic censorship of audio-video programming at the receiver in accordance with a viewer-selected censorship mode and multivariate censorship classification data encoded in the audio-video programming signal. The censorship classification data comprise codes that classify...http://www.google.de/patents/US5195135?utm_source=gb-gplus-sharePatent US5195135 - Automatic multivariate censorship of audio-video programming by user-selectable obscuration
