This font is a derivative of the Apache Licensed open source font, Open Sans.
UPDATE: New weights added, plus files made a little bit more space efficient.
Licensed as: Apache License 2.0
Licensed under the Apache License, Version 2.0
Open Sans is a trademark of Google and may be registered in certain jurisdictions.
Digitized data copyright (c) 2010-2011, Google Corporation, Design Modifications and new weights 2015, Cannot Into Space Fonts