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I don't like the idea of software, even presumably acting with good intentions, running on my machines without my approval. Sure, I assume that it is meant to be installed by knowledgeable, most likely government users, but if it can react to external threats and "infect" the threat source autonomously, it seems like just a matter of time before it is essentially invited to infect a "black hat" machine through an attack, and the bad guys get access to the code to modify and use for their own purposes. I also have concerns about the effect on memory and processor cycles, and bandwidth consumption, which seems inevitable with this type of software. Nothing is free, so I would also expect to see memory drain if this is constantly running on machines to provide active defense against attacks. All in all, I lean towards thinking this concept of a "good virus" is probably a bad idea.