Using fonts without their authorization is considered infringement.
If I am contacting you, first check whether you have used it and how many types you have used. Be nice, apologize, and change everything immediately. It should not be a big problem, or you can compensate according to the other party's requirements. .
Get authorization and use it later.
Computer fonts are typical copyrighted works.
According to the Copyright Law of the People's Republic of China and the People's Republic of China, when using other people's works, a license contract must be concluded with the copyright owner.
Rights not expressly permitted or transferred by the copyright owner may not be exercised by the other party without the consent of the copyright owner.
Article 4 of the "Copyright Law Implementation Regulations" refers to paintings, calligraphy, sculptures and other aesthetically significant two-dimensional or three-dimensional plastic art works composed of lines, colors or other methods.