Fonts for the iOS apps

[paolo mazza]

Hi All,
consider I need to  import the "Arial Narrow" font to my iOS app .
Referring to the documentation it says :"Make sure you have an
appropriate license for the fonts you choose to bundle with your app
like you would any other media such as sounds, images and videos."
All the fonts need licences? How can I get these licences?
I guess it is a bit complicate. Any experience on this issue?
Thanks a lot.
All the best

Paolo Mazza