.. _licensing-principles:

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Licensing Principles
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FindFace Enterprise Server is licensed by the following criteria: 

#. The number of biometric samples extracted from faces detected in static images and videos. 
#. The number of cameras in use.
#. The number of ``findface-extraction-api`` model instances in use.
#. Face features recognition: gender/age/emotions/glasses/beard. 
#. Face liveness detection.
#. Fast index.

You can choose between the online and on-premise (aka offline) licensing: 

* Online licensing requires a stable internet connection. Upon being disconnected from the internet, the system will continue working off-grid for about 1 hour.
* On-premise (offline) licensing requires a USB port on the physical server with the ``findface-ntls`` component, that will be used to plug in a provided USB dongle. 

To provide the system functioning, one ``findface-ntls`` instance should be enough. If for some reason, your system requires more license servers, contact your Ntech Lab manager beforehand to prevent your system from being blocked. 

 
.. seealso::
   :ref:`ntls`