NetDefend UTM firewalls implement stream-based virus scanning technology without first caching incoming files, thus increasing inspection performance and easing network bottleneck nightmares while enabling powerful virus defense capabilities. D-Link’s firewalls use virus signatures from the known, respected antivirus company Kaspersky Labs to provide our customers with prompt signature updates and reliable, accurate antivirus signatures. Using a built-in extreme-performance AV acceleration engine together with stream-based virus scanning technology, NetDefend UTM firewalls block viruses and malware before they ever reach your network’s desktops or mobile devices. NetDefend firewalls create a safer network environment for companies of all sizes, from SMBs to enterprises. This license works only with DFL-260/DFL-260E and cannot be activated on any other model. Please make sure you are buying the correct license for your model. Once received, there are no returns or refunds on license keys. For RMA exchanges on products with activated licenses, please contact D-Link Support directly at support.dlink.com. Do not RMA the product through the Distributor. Please consult the DFL Series Firewall product pages and datasheet for more details.