Asimov is a Derivative of the Apache Licensed open source font, Roboto.
We have added a couple characters (Including the new Russian Ruble sign) and tweaked a few more, plus made new widths and display weights, and our own Oblique Italics.
Licensed under the Apache License, Version 2.0
Roboto is a trademark of Google.
Font data copyright Google 2014, Design modifications and new weights 2015, Cannot Into Space Fonts