
One reason is because the products are priced on a per seat basis. Many commercial vulnerability scanner companies typically require companies to register network addresses or DNS names as part of the licensing process. In addition, the Professional Feed provides the ability to search content for sensitive data. However, companies that used Nessus' Registered Feed will now have to pay for the privilege by subscribing to the Professional Feed, which gets you access to plug-ins that are aimed at enterprise use such as host configuration checks that conform to the Federal Desktop Core Configuration requirements and the Center for Internet Security checklists. As soon as the plug-ins are available, they will be current. The biggest benefit in the license change is that there is no longer a delay to the updates for the free Home User feed. In a letter to their users, Tenable said charity and educational organizations can still receive the Professional Feed free. Current organizational users will have to purchase a Professional Feed to continue to use Nessus in the workplace.

The Professional Feed is aimed for organizational use at an annual cost of $1,200. They replace the free Registered Feed option where users could update plug-ins after a seven-day period with a free Home Feed that offers updates with no delay and the current Direct Feed, which will be replaced with the Professional Feed. Tenable Network Security is changing the licensing model for Nessus.
