Flat UI Free is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) (http://creativecommons.org/licenses/by/3.0/).
You are allowed to use these elements anywhere you want, however we’ll highly appreciate if you will link to our website when you share them - http://designmodo.com
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Flat UI Free is made using the Lato typeface, which can be downloaded for free here: http://www.google.com/webfonts/specimen/Lato