Hawking presents his ideas about the problematic "Information Loss Paradox" - the phenomena that no light or matter can escape or be detected within the event horizon of a black hole. Hawking theorizes that this "information" is not lost, but rather scrambled.

"I propose that the information is stored not in the interior of the black hole as one might expect, but in its boundary, the event horizon...but in a chaotic and useless form. For all practical purposes the info is lost."