Hello, poster
The calligraphy font itself is copyright-free, but it needs to be recognized.
After all, what kind of font did you say you invented, if If a lot of people don't recognize it, then it doesn't exist.
In fact, from a macro perspective, each of the 1.4 billion Chinese people has a calligraphy style. But no one has applied for copyright.
In the calligraphy industry, copyright is limited to complete calligraphy works.