This paper reviews published material on the subject of beneficial computerviruses and worms, that is, self-replicating programs for useful purposes. The topicsinclude Shoch and Hupp's worms at the Xerox Palo Alto Research Center (PARC),Cohen's proposals for uses for viruses, and Vesselin Bontchev's anti-virus sentiments.Finally a simulation of using viruses to destroy other viruses is included.
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