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Legal issues when copying nRF51 Dongle Meandered antenna

Hi, I would like to make an exact copy of the nRF51 dongle antenna (as was recommended by multiple blog posts by Nordic). I am concerned about the legal issues, and any IP that may surround a design like. I am wondering if Nordic is aware of any IP / patents that have been acquired for trace antenna designs? Is it safe to say that when in mass production, there will be low risk of getting sued because of the antenna design? 

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