This font has been adapted for Ink/Stitch, and is licensed under the SIL Open Font License, Version 1.1.

This font is a derivative work from Linux Libertine font (also licensed under SIL Open Font License, Version 1.1): 

https://libertine-fonts.org/

Linux linertine fonts  are licensed under GPL (with font exception). Since version 2.1.9 Libertine Fonts are also licensed under the OFL. 
Further information about the GPL can be found here: GPL License text (https://www.gnu.org/licenses/gpl-3.0.html), Wikipedia (https://en.wikipedia.org/wiki/GNU_General_Public_License). 
For the OFL respectively: OFL License text (https://openfontlicense.org/), Wikipedia (https://en.wikipedia.org/wiki/SIL_Open_Font_License).