Adobe non free code in type 1 fonts
The problem
Font hinting use some proprietary code from adobe. The non free code is described here: http://partners.adobe.com/public/developer/opentype/index_ps_code3.html
How can I check
Lintian will help see #694328
Install the t1utils package and run the following command on the pfb file t1disasm file.pfb check if you see the non free code.
How to solve
Rewritting is difficult: * the adobe code is part of the language * some printers search and replace the adobe code by theirs own routine * the adobe code is buggy (leak memory) and postscript interpreter patch it at run time