Signal bleed is a type of filter, usually for cable television, that does not block a targeted channel as designed. Such filters came to public awareness as more channels with adult material began to be available on cable television services and, occasionally, children were able to view faint or partial images of adult material on channels that were supposed to be completely blocked.
Signal bleed was discussed in the 1999 U.S. Supreme Court case United States v. Playboy Entertainment Group.
References
Signal bleed Wikipedia(Text) CC BY-SA