[Gs-devel] More on PMingLiu font

Igor V. Melichev igor at artifex.com
Tue Nov 13 12:13:13 PST 2001


Before now I supposed that (1) implementation of the bytecode interpreter
requires a license,
and (2) some CJK TT fonts use a special technique, being patented.

Isn't (1) true now ?


-----Original Message-----
From: gs-devel-admin at ghostscript.com
[mailto:gs-devel-admin at ghostscript.com]On Behalf Of L. Peter Deutsch
Sent: Tuesday, November 13, 2001 9:47 PM
To: igor at artifex.com
Cc: ray at artifex.com; dan at artifex.com; mpsuzuki at hiroshima-u.ac.jp;
gs-devel at ghostscript.com
Subject: Re: [Gs-devel] More on PMingLiu font

> Mr. Suzuki's test uses TT bytecode interpreter, right ?
> We don't have license for it.
> So all this looks inapplicable.

Maybe not.  The patents don't cover the bytecodes: they cover particular
algorithms, which the TT specification says the bytecodes are supposed to
use.  The FreeType2 interpreter, compiled with NO_APPLE_PATENT, uses
somewhat different algorithms, that do hinting less well but that are good
enough to handle the special needs of fonts like PMingLiu, and that also
might not be subject to the patents.  I hope we will get answers about this


L. Peter Deutsch     |    Aladdin Enterprises   |  203 Santa Margarita Ave.
ghost at aladdin.com    |  http://www.aladdin.com  |  Menlo Park, CA 94025

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