haven’t got a link for it seen it on tv but there is this young asian scientist who was exploring it - they would set up a studio with multiple cameras to film someone from many angles and then fire thousands of questions at them a bout their personal life and families etc so buildding up a thick diary or the person on dvd.not sure about the next step but the younger members of the family were brought in and they could sit and ask any question from their then alive father /grandfather etc and the father grandfather on dvd would respond in kind - that was the clever technology so it is suggested that this is set up before people are deceased for future engagements and family get togethers? - I’m sure you could easily track it down?? this guy also built a electric car for a young paraplegic kid to operate it via his eye movements whilst sitting in the car and driving it - the technology is truly amaizing and of course available at a price - good hunting