Dynamic Fonts: Fallback Font license?

Hi, Unity supports dynamic fonts, which is a pretty cool feature especially for localizing texts. It replaces unsupported characters in a font with characters of a default (fallback) font. This font looks quite similar to Arial. But what about the license of this default font? I couldn't find anything either on the internet nor in the unity manual / license agreements. The manual only says > "Note that fonts are subject to> copyright and you should only include> fonts that you have licensed or> created for yourself." which is quite unsatisfying... Can anyone (maybe some Unity-Intern people?) tell me more about the license agreements? Can I use this fallback font in a game without any legal risks?