Shares in Samsung Electronics are falling after the smartphone giant sued rival Huawei in multiple courts in China over alleged patent infringement, BBC reports.
They're down by 2% in Seoul. The benchmark Kospi is trading flat.
The two companies are already entangled in several legal battles over the use of proprietary technology, including fourth-generation (4G) cellular technology, operating systems and user interface software.
Huawei sued Samsung in the US in May.
The rest of Asia's share market are mostly lower on Friday due to a tepid earnings season so far on Wall Street.
Japan's Nikkei and the broader Topix are both 0.8% lower in Tokyo.
However Nintendo shares have outperformed the broader market, jumping by more than 3% on news it's finally launched the wildly popular Pokemon Go in Japan.
Australian shares are down 0.3% and New Zealand stocks are marginally higher by 0.1%.
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