China's major software company, Kingsoft Corp., started offering Wednesday its popular antivirus software for free on the Internet, becoming the first Chinese company to make a full-scale entry into the Japanese software market, its Japanese arm said.

The software is the Japanese version of the most popular antivirus software in China, Kingsoft Japan Corp. said.

The first 1 million people to download the software get free use for one year, while everyone else will get six months of free use, the company said. After the free period expires, the renewal fee will be 980 yen a year, the company said.

China's biggest computer maker, Lenovo Group Ltd., is the biggest shareholder of Beijing-based Kingsoft, established in 1988.