Dynamic Content Filtering is a powerful feature that enables the administrator to allow or block access to web sites depending on the category they have been classified into by an automatic classification service. This is similar to parental control software on the PC except it is done at the gateway to benefit all devices (PCs, laptops, mobile devices) on the local area network. Dynamic content filtering requires a minimum of administration effort and has very high accuracy. 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.