"Silicon Graphics Inc has transferred much of its 3D
graphics patents portfolio to Microsoft.
These form the heart of a mysterious transaction which showed up
in SGI SECC filings last year, with Microsoft paying $62.5 million
for unspecified "intellectual property" rights to SGI.
SGI insisted at the time these are "non core" technologies, but
sources close to the Mountain View are emphatic that these
represent the bulk of SGI's 3D intellectual property assets, a view
confirmed by documents disclosed to The Register."