On stockpiling defensive patents
By
Dave Winer on Thursday, April 19, 2012 at 2:39 PM.
Companies aren't stockpiling patents as a defense against patent trolls. They don't work because the trolls don't make anything that could infringe on a patent, unless your patent is about patent lawsuits (don't laugh, I heard there are some). 
So when a company says their patents are only defensive, that's probably not the full story.
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