A license is required to use Dr.Web. You can purchase it on the Doctor Web website 
or through authorized partners. The license allows you to use all application features during the entire license period. User rights are set in accordance with the License Agreement, which users are required to accept during installation.
Each license has a unique serial number, and a special file with license parameters is stored locally on the computer. This file is called a key file.
If you want to learn more about Dr.Web for macOS features before purchasing it, you can activate a trial version. All features and protection components of the application are available in the trial version.