This stems from the notion that information can not be destroyed, so for example the 2D event horizon of a black hole «records» everything that falls into it. (newscientist.com)
He says existing models of the jets assume they require certain properties unique to black holes, such as event horizons. (sciencemag.org)
Those results suggested that anyone falling into a black hole would be burned up as they crossed its edge - the so - called event horizon. (religion.blogs.cnn.com)