Remember that a copyright is not like a patent. If you were to regenerate those "parabola points" by looking at non-copyrighted material, you are in the clear,

Remember that a copyright is not like a patent. If you were to regenerate those "parabola points" by looking at non-copyrighted material, you are in the clear, even if you end up at the same values. So to public domain a font, all you do is display it on one screen, then recreate it on another. Because the appearance of font itself is not copyrighted.