What is a computer virus ? Well, the best definition we have been able to come up with is the following: #1 A virus is a program that is able to replicate, that is create (possibly modified) copies of itself. #2 The replication is intentional, not just a side-effect. #3 At least some of replicants in turn are also viruses by the same definition. #4 A virus has to attach itself to a "host", in the sense that execution of the host implies execution of the virus.
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