A key file is a file with the .key extension that you receive from Kaspersky. Key files are designed to activate the application by adding a key.
You receive a key file at the email address that you provided when you bought Kaspersky Security or ordered the trial version of Kaspersky Security.
You do not need to connect to Kaspersky activation servers in order to activate the application with a key file.
You can restore a key file if it has been accidentally deleted. You may need a key file to register a Kaspersky CompanyAccount, for example.
To restore the key file, you need to contact the Kaspersky partner from whom you purchased the license.
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