Changes... can only be effected by alterations in the original. The only thing not prerecorded in a prerecorded universe are the prerecordings themselves. The copies can only repeat themselves word for word. A virus is a copy. You can pretty it up, cut it up, scramble it - it will reassemble in the same form.
William S. Burroughs (2013). “Cities of the Red Night: A Novel”, p.166, Holt Paperbacks