You must have a valid BlackIce Licence to install this version. BlackICE Defender delivers bulletproof intrusion detection and personal firewall protection to your PC. It scans your DSL, cable, or dial-up Internet connection looking for hacker activity, much like antivirus programs scan your hard disk looking for viruses. BlackICE will not slow down your PC or your Internet experience. BlackICE Defender protects you in ways the other personal firewalls or antivirus software don\'t: it detects the attack, identifies and blocks the malicious activity before it can reach your computer, and identifies the attacker and type of attack by name; it fully inspects the contents of each packet, looking for hidden hostile code that personal firewalls cannot detect; it protects you from attack, even from someone you trust, through its dynamic IP address and port blocking. BlackICE Defender is also easy to install, requires no knowledge of networking or the Internet, and begins to protect your system right out of the box.