Font Types
Type 1 fonts are fonts that are encrypted (secret code) and use Adobe's
proprietary hinting technology for low resolution display. Type 1 fonts decode
the font information using the 'eexec' operator (documentation to which should
be released within a few months). Type 3 fonts are fonts created by anybody
else using plain and simple PostScript definitions, be it packed or unpacked
arrays, for the character descriptions and everything else dealing with that
particular font. Fontographer creates Type 3 fonts, for example. Or you can
hack out a piece of PostScript code (copied from one of Adobe's or someone
else's books) that define a few characters of a Type 3 font.