Seems to me this way: http://www.patentstorm.us/patents/6252671/description.html
But IANAL...
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It's nice to see that the first ( only?) FOSS OpenType math font,
(and by that I mean one that has a math script, like Cambria Math),
has been added to rawhide. But the font is currently useless in
Fedora, because (i) our XeTeX is too old, and (ii) the unicode-math
XeLaTeX package is not
The STIX fonts do **NOT** currently have the math OpenType script.
What this means is that they have nice collection of glyphs, but no
special layout features, so they're pretty useless for actually
typesetting something with them. The math script, aka MATH table, is a
MS extension to OpenType. MS
It turns out that STIX beta fonts have a modicum of MATH table (it
didn't occur to me check), but not math script support. Because of the
MATH table, STIXGeneral gets recognized as math font in Office 2007,
but it doesn't really work; as soon as you type anything, you get
Cambria Math instead.
Unlike Office 2007, XeTeX checks if a font contains the math script,
not the MATH table to decide whether it will work or not for Unicode
math. So with STIX it complains:
Package fontspec Warning:
Font STIXGeneral/ICU at 12.0pt does not contain script 'Math'
And predictably, it doesn't work:
