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License key - A file with the .kеу extension that serves as your personal "key" required for the proper operation of Kaspersky Anti-Virus Personal. The license key is included in the distribution kit if you purchase your copy of Kaspersky Anti-Virus from a Kaspersky Lab dealer. If you purchase the product online, the license key file will be sent to you via email. Kaspersky Anti-Virus Personal WILL NOT WORK without the license key.
License period - A period during which you have the right to use Kaspersky Anti-Virus. The license period is defined by a valid license key and is, as a rule, one year from the date of purchase. After your license expires, the product will still work but you will not be able to update the anti-virus database.