Competitiveness in The Antivirus Software Industry
It is generally accepted in the antivirus industry that the signature-based protection of most vendors is identically effective. If a signature is available for an item of malware, then every product (unless dysfunctional) should detect it. However, some vendors are significantly faster than others at becoming aware of new viruses and/or updating their customers signature databases to detect them.
There is a wide range of effectiveness in terms of zero day virus protection. The German computer magazine c't found that detection rates for zero day viruses varied from 20% to 68%. It is primarily in the area of zero day virus performance that manufacturers now compete.
Read more about this topic: Zero-day Virus
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“Your representative owes you, not his industry only, but his judgement; and he betrays instead of serving you if he sacrifices it to your opinion.”
—Edmund Burke (1729–1797)