There are various security vendors that produce anti-spyware products that either does or doesn't include anti-virus protection. For example PC Tools and Webroot both have programs that can combine both anti-spyware and anti-virus technology into one product, but you can also buy only the anti-spyware package without the anti-virus protection. Since a clear difference between different kinds of malware is becoming blurred more and more, and all kinds of malware have characteristics that can either belong to viruses, spyware or other malware.... how do security vendors like PC Tools and Webroot make the decision in what product/suite they are gonna add a certain malware sample as signature? They can either add it only to there combined anti-spyware with anti-virus package or they can choose to also add it to there anti-spyware only package without anti-virus. Any ideas? To clarify my question a bit: Quote from the PC Tools website: The items marked bold are the differences in detection signatures.