License functions on firewalls

The license definition is as follows:
A license is an agreement made by and between a supplier and a customer on authorizing or being authorized the usage scope and time limit of the sold or bought product. A license can dynamically control features of products available for a customer.
A license is an agreement in which the supplier authorizes the customers to use certain functions, resources, and upgrade services of the purchased products before expiry. Physically, a license consists of a license certificate and a license file.
-A license certificate is issued by a supplier to a customer who purchased the license, for activating the license. The license certificate contains Contract No., Activation Password, and license content.
-A license file is a .dat file provided for the customer after the license is activated. The customer needs to load the license file on a device or software to use the related functions.

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