This font is for PERSONAL USE ONLY and requires a license for commercial use. 
The font license can be found and purchased at: 
https://efstudiotype.com/darline/

For more license info:
https://efstudiotype.com/license/

Custom License is available, please contact:
efstudio2@gmail.com

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For further information, please contact designer:

Ef Studio
efstudio2@gmail.com
https://efstudiotype.com