This is obviously thirdhand (I'd love to see the actual comments), but from:
http://samba.org/samba/news/articles/low_point/column11.html
"The only sparks that flew where when Microsoft made it abundantly clear
that they would use their patent portfolio to prevent the spread of GPL
software. Section seven of the GPL (the implicit patent grant of the
license) now looks like the most prescient writing Richard Stallman has
ever done. If you're not familiar with it I'd suggest you read it and
understand why using the GPL to protect your Free Software is so important."
-a
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