SGI owns US Patent #6,650,327, issued November 18, 2003. SGI
believes this patent contains necessary IP for graphics systems
implementing floating point (FP) rasterization and FP framebuffer
SGI will not grant the ARB royalty-free use of this IP for use in
OpenGL, but will discuss licensing on RAND terms, on an individual
basis with companies wishing to use this IP in the context of
conformant OpenGL implementations. SGI does not plan to make any
special exemption for open source implementations.
Contact Doug Crisman at SGI Legal for the complete IP disclosure.