Resposta curta: Sim, é.
Longa resposta: leia a licença , especialmente a parte "Permissão & Condições ".
This licence allows the licensed fonts to be used, studied, modified and redistributed freely. The fonts, including any derivative works, can be bundled, embedded, and redistributed provided the terms of this licence are met. The fonts and derivatives, however, cannot be released under any other licence.