HBO's Last Week Tonight highlighted an east Texas city's role in infamous "patent troll" cases. Patent trolls, as host John Oliver explains, are companies that don't produce anything but shakedown those who do. The business model centers on buying patents and threatening litigation. They've been effective, costing investors half a trillion dollars since 1990, Oliver says.

Topics:  hbo's last week tonight   texas   patent   john oliver   oliver   
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