China's web service giant Baidu is officially suing Sogou, a subsidiary of the Chinese online services giant Sohu, for copyright infringement.
Baidu filed ten lawsuits against Sogou in the Beijing Intellectual Property Rights Court, alleging that Sogou Pinyin - a popular Chinese input software, and the Sogou Mobile Input Method infringed Baidu's IP input method.
The claimant is seeking 100 million yuan (about US$14.8 million) in compensation.
Sogou said it hadn't received any indication of the lawsuit or a "court notice".
This isn't the first time these two companies have been embroiled in litigation against one another.
Back to 2014, Baidu sued Sogou for unfair competition, claiming Sogou's integration of search functionality in its Chinese character input method editor (IME) was effectively hijacking Baidu's search engine traffic.
In October 2015, the Beijing Haidian People's Court ruled that Sogou should stop its illegal behavior at once and offer Baidu 500,000 yuan (about US$74,000) in compensation.
Meanwhile, Sogou filed eight lawsuits against Baidu in the Beijing IP Rights Court for copyright infringement, and asked for 80 million yuan (about US$11.8 million) in damages in October last year.
Later in November 2015, Sogou filed another nine lawsuits against Baidu in various courts for copyright infringement, and demanded 180 million yuan (about US$26.6 million) in compensation.
Baidu said eight of the patents Sogou was suing it for claiming copyright infringement, were invalid.
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