Free & open art & design resources are listed under Creative Commons licences. However, not all Creative Commons licenses are the same. See below to ensure you're using work that is licensed correctly. (Tip, is it CC0?)
What are the 6 types of Creative Commons? What is the difference?
There are a total of six licenses types, the following is a brief description of each type including usage range, this will help you to identify whether the font you download can apply in your projects!
Attribution (BY)
Attribution-Noncommercial (BY-NC)
Attribution-Share Alike (BY-SA)
Copy
Adapt or modify
Redistribute (publish, display, publicly perform or communicate the work)
License to others on the same terms as the original work
Attribution-No Derivative Works (BY-ND)
Attribution-Noncommercial-Share Alike (BY-NC-SA)
Copy
Adapt or modify
Redistribute ( publish, display, publicly perform or communicate the work )
License to others on the same terms as the original work
Noncommercial usage
Attribution-Noncommercial-No Derivative Works (BY-NC-ND)
Among those, CC0 (aka CC Zero) is the one that allows creators to give up their copyright and put their works into the worldwide public domain. It allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, with no conditions.