FORTUNE -- Buying patents and suing companies for violating them is a large and growing business, and nobody has felt its impact more than Apple (AAPL).
Of all the companies sued over the past five years by so-called non practicing entities...
Apple is the patent trolls’ No. 1 target, with 171 suits since 2009
So-called non practicing entities filed a total of 3,025 lawsuits last year and collected on 1 of 4.
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