ZoneAlarm is one of the most popular and trusted free firewall software for Windows operating system, There exist two version of the software - ZoneAlarm Free and ZoneAlarm Pro, as the name suggests ZoneAlarm Free does not cost anything and provides basic firewall protection, the Pro version provides a complete internet security solution including advanced firewall, Identity Theft protection coupled with complete Anti-Spyware Protection but costs $40 to buy.

Now the good news is that under a special promotion the parent company ChekcPoint Software's is giving away free genuine license keys for ZoneAlarm Pro internet security suite on November 18, 2008.