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But, I have heard that Norton AntiVirus will find unknown viruses, so why get the virus signatures?

April 26, 2017antivirus heard Norton signatures unknown virus viruses

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But, I have heard that Norton AntiVirus will find unknown viruses, so why get the virus signatures?

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Norton AntiVirus detects unknown viruses through their activity or changes made to inoculated files. However, this is not as reliable as detecting them via their signatures. In addition, the signature files are needed to increase the probability of removing the virus without damaging the file it is attached to.