Microsoft patent math

Microsoft officials threw down the patent gauntlet, claiming free and open-source software violated 235 of its patents — but refused (and continue to refuse) to get more specific. Today, thanks to a post by my ZDNet blogging colleague Jason Perlow, there’s a new piece of patent info that should be of interest to those trying […]

Microsoft officials threw down the patent gauntlet, claiming free and open-source software violated 235 of its patents — but refused (and continue to refuse) to get more specific. Today, thanks to a post by my ZDNet blogging colleague Jason Perlow, there’s a new piece of patent info that should be of interest to those trying to keep score at home.

Last year, Microsoft officials said Linux violated 42 Microsoft patents; Linux GUIs (graphical user interfaces) violated 65; Open Office violated 45; various free/open e-mail programs violated another 15; and assorted, sundry free/open-source software programs violated 68 Microsoft patents. That is as granular as the Redmondians were willing to get.

Today, thanks to a very in-depth analysis by Tom Kemp, CEO of Linux/Unix independent software vendor Centrify, there’s a bit more detail on what Microsoft has patented in the Windows space. Using patent information Microsoft was required to make public by the antitrust watchers with the European Commission, Kemp counted how many Windows Server patents Microsoft has applied for and been awarded.

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Microsoft, Patent