ScreenOS - upgrade license - 25 virtual systems

ScreenOS is the underlying operating system software that provides the features needed to implement network security and the associated policies for any NetScreen security appliance or system. When establishing or managing any firewall, VPN encryption or traffic shaping functions, ScreenOS offers the configuration, management and monitoring tools required-all of which are available through either an object oriented Web-based GUI, the ScreenOS WebUI, or Command Line Interface (CLI).

Rather than being based on "open source" operating systems that can be cracked, ScreenOS is a proprietary operating system developed by NetScreen. This development ensures that NetScreen products are optimized to meet the performance and security requirements of e-businesses, enterprises and service providers.