Each license has a unique serial number. You can use it to activate the Dr.Web license.
Where to find my Dr.Web serial number
If your serial number is not registered
•You can find your serial number in the email you received from the online store after you purchased your license.
•If you purchased your license in the Dr.Web online store via your Doctor Web account and registered your license in the loyalty program, your serial number will be stored in the My purchases 
service.
•If you purchased your license in a box, you can find your serial number in the License certificate.
If your serial number is registered
•If Dr.Web is installed on your device, download this file and unpack it. Double-click the YSN.cmd file. The YourSerialNumber.txt file will be created in the folder and automatically opened in the default text editor. All of your serial numbers will be listed in this file after “SN =”.
•If Dr.Web is not installed on your device, restore the number using a service on the Doctor Web website .
If you are using Dr.Web on a subscription basis
In this case, you do not need a serial number or a key file.
•If you purchased your subscription on the Doctor Web website , you can find your subscription ID in My subscriptions section .
•If you purchased a subscription from a third-party provider, you can find the subscription ID in your account on the website of your IT service provider.
How to restore the serial number
If you can’t find your serial number, you can restore it as follows:
•Contact the license seller (except for the boxed version).
•Use the recovery service on the Doctor Web website .
•Contact Doctor Web technical support . Attach documents confirming that you are the license owner as listed in these rules to your request.