Death is final, leaving those of us who survive with memories, photos and the belongings of those who have passed. But now technology and the internet may be changing some of death's finality: your digital imprint can live on after your death. An artist in Los Angeles, exploring what can be done with the data you leave behind, has created a make-believe company called the Hereafter Institute to show how we can remember the dead in the future … perhaps. Elizabeth Lee reports from Los Angeles.