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While I agree with the general sentiment, I would not classify Dolby as a "patent troll" — they still do invest in research and developing products, right?
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I'd classify any patent racketeer as a troll. Dolby has nothing to do with AV1, they just want a parasitic rent on it. Whether the troll actually does anything else besides the trolling part isn't really relevant.
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Patent mob seems more fitting.

Another example is Qualcomm

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How is Dolby a patent troll? :D
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Because they have nothing to do with AV1, they simply want to leech on it. It's fitting to call them a patent troll.
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