A patent issued in 2003 called 'Method and system for demultiplexing a first sequence of packet components to identify specific components wherein subsequent components are processed without re-identifying components' is now owned by Implicit Networks, who has recently claimed Windows 7 infringes upon it with its Filtering Platform. This is used in Vista, Windows 7 and Windows Server 2008. Implicit is seeking a jury trial and damages. A shocking turn of events; you actually want to cheer for Microsoft this time as Implicit is nothing more than a patent licensing company (troll) and has done battle with Sun, AMD, Intel and NVIDIA.

http://yro.slashdot.org/story/09/12/...t-Infringement