If you want to disrupt someone’s business, make your software free. That’s a mantra these days as more companies leverage Internet business models to gain an advantage over competitors.

Check Point Software Technologies is using that strategy today as it launches ZoneAlarm Free Firewall. The cloud-based software will provide an extra layer of protection on top of the antivirus software that consumers and corporations already have.

The firewall uses ZoneAlarm’s community of millions of users to improve security. Check Point’s DefenseNet service analyzes the malware that is automatically reported by those users. Once the safety or danger of a given program is determined, the information is then shared throughout the cloud. It immediately enables the firewall to block attacks and virtually eliminates the need for program alerts and interruptions.

AV-Comparatives.org, an independent research company, asserts that antivirus software misses nearly one in three new viruses. A strong firewall can stop new viruses and other attacks. ZoneAlarm’s firewall includes an inbound and outbound firewall, preventing hackers from getting into a PC and blocking the transmission of data from a computer that has been attacked.

Rivals include the built-in firewall in Microsoft Windows, but that only provides inbound protection. ZoneAlarm also competes with Symantec and McAfee. ZoneAlarm provides some software for free and charges money for premium services.

Redwood City, Calif.-based Check Point is publicly traded and has been on a steady pace of innovation. Check Point bought ZoneAlarm six years ago and it now has tens of millions of users.