Zoran Kostic fonts
No font made according to the existing Latin fonts has been directly copied. No letter was obtained by copying and transformation from the original font. The letters were drawn on the basis of scanned material, the height and width of the letters were defined according to the taste of the author, as was kerning. The similarity between the original and these fonts is deliberate.
Definition of copyrigts for fonts
If the vector drawing of a letter/sign defined by points with appurtenant Bezier's curves is defined as a program and thereby as an original work, then the simple copying of the vector form of a letter with one or two simple transformations is considered a breach of copyrights, although the points are no longer in the same places (due to the transformation) as in the original. Protected font names cannot be used but variants reminiscent of the original name are permissible. For instance, Swiss, Bern, etc., which are derived from Helvetica. Citing the name of the original and designer in the font notes is also considered to be a nice practice.