Freetype
We currently do not enable the Truetype compile option that would cause us to use patented technology.
We therefore fall under the FreeType. License, a BSD-like license, found in the file `FTL.TXT'.
Here is more detail taken from recent emails between RM and XM:
zlib
Compression library
zlib.h -- interface of the 'zlib' general purpose compression library version 1.2.3, July 18th, 2005
Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
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Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:
OpenSSL
Crypto library uses the OpenSSL, the license is as follows:
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The data format used by the zlib library is described by RFCs (Request for Comments)
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Question: Can you provide a list of compilation/build options we use with the Freetype library.
Do you know if we are building in a manner that uses patented technology from Apple?
Answer: The bytecode interpreter in the TrueType driver is currently not compiled in,
so what happens is it's always the FreeType auto hinter doing the job. So there is no patent issue
with the current configuration.
You need to refer to stage/usr/local/include/freetype2/freetype/config/ftoption.h
You will see that TT_CONFIG_OPTION_BYTECODE_INTERPRETER is not defined. If we were to
change that we would need to define
bothTT_CONFIG_OPTION_BYTECODE_INTERPRETER and TT_CONFIG_OPTION_UNPATENTED_HINTING
also set unpatented hinting when creating the face.
Define TT_CONFIG_OPTION_BYTECODE_INTERPRETER if you want to compile a bytecode interpreter in the
TrueType driver. Note that there are important patent issues related to the use of the interpreter.
By undefining this, you will only compile the code necessary to load TrueType glyphs without hinting.
Do not #undef this macro here, since the build system might define it for certain configurations only.
#define TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Define TT_CONFIG_OPTION_UNPATENTED_HINTING (in addition to TT_CONFIG_OPTION_BYTECODE_INTERPRETER)
to compile the unpatented work-around hinting system. Note that for the moment, the algorithm is only used when selected
at runtime through the parameter tag FT_PARAM_TAG_UNPATENTED_HINTING; or when the debug hook
FT_DEBUG_HOOK_UNPATENTED_HINTING is globally activated.
#define TT_CONFIG_OPTION_UNPATENTED_HINTING
Also see BdvdTrueTypeInfoFile explains why
TT_CONFIG_OPTION_BYTECODE_INTERPRETER is disabled by default. Also about patents:
http://freetype.sourceforge.net/patents.html
Jean-loup Gailly Mark Adler
jloup@gzip.org madler@alumni.caltech.edu
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