Copyright 2014 by (URW)++ Design & Development.
Copyright 2016 by Lapis Lazuli Texts.
These fonts inherit a font embedding exception from the GhostPDL project:
Additionally, the font files (in Resource/Font) are distributed under the AGPL with the following exemption:
As a special exception, permission is granted to include these font programs in a Postscript or PDF file that consists of a document that contains text to be displayed or printed using this font, regardless of the conditions or license applying to the document itself.
The license for the fonts is the GNU AGPLv3:
GPL Ghostscript is free software; you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
GPL Ghostscript is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with this program so you can know your rights and responsibilities. It should be in a file named doc/COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place Suite 330, Boston, MA 02111-1307, USA.
The specific license terms may be found in the file AGPLv3.txt.
Scripts included for building the fonts are dedicated to the Public Domain.