Permissions to use Dr.Web for UNIX Mail Servers are granted by the license purchased from the Doctor Web company or from its partners. License parameters determining user rights are set in accordance with the License agreement (see, which the user accepts during Dr.Web for UNIX Mail Servers installation. The license contains information on the user and the vendor as well as usage parameters of the purchased copy, including:

list of components licensed to the user;

Dr.Web for UNIX Mail Servers license period;

other restrictions (for example, number of computers on which the purchased copy is allowed for use).

For evaluation purposes users can also activate the demo period. After successful activation, demo period provides users with full functionality of Dr.Web for UNIX Mail Servers for the whole activated period.

Each Doctor Web product license has a unique serial number associated with a special file stored on the user computer. This file regulates operation of components in accordance with the license parameters and is called a license key file. Upon activation of a demo period, a special key file, named a demo key file, is automatically generated.

If a license or a demo period are not activated on the computer, Dr.Web for UNIX Mail Servers components are blocked. Moreover, updates for virus databases and components cannot be downloaded from Doctor Web update servers. But you can activate Dr.Web for UNIX Mail Servers by connecting it to the centralized protection server as a part of the anti-virus network administered by the enterprise or internet service provider. In this case, operation of anti-virus and updating are managed by the centralized protection server.