Hi Sabrina,
Thanks for contacting us!
Most fonts on Ribbet are freely available for commercial use or are “donationware” and require a small donation. To check, simply select the font you are interested in, and then click the little Human icon next to the Add/Delete buttons (up the top left of the Text tab). This will display a link to the font’s web page where you can check on the license requirements.
Let us know if you have any further questions.