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A multiple activation key (MAK) is a software licensing and activation tool that provides one-time activation of a software product via a hosted authentication/activation server. This software product activation and authentication technique is used by Microsoft for validating single or multiple computers.
A multiple activation key requires a computer to connect and authenticate itself only one time to activate the software or operating system. The product activation via MAK can be achieved by either:
MAK has predefined activations allowed, meaning that MAK does not activate the product beyond its available limit.