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China's new data export rules cast doubt over Hong Kong's role as gateway to the mainland

China's new rules governing how data can be sent outside the country could erode Hong Kong's role as a gateway for international businesses to enter the mainland market, experts said.

Starting from September, China will require companies that meet certain criteria to pass a security assessment by the Cyberspace Administration of China (CAC) before transferring data outside the border, according to new regulations finalised earlier this month.

The process will apply to a broad range of companies, including those that handle the personal information of more than 1 million Chinese citizens, and those that seek to transfer "important data" - a term that has not been properly defined.

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An entity will also need to undergo an assessment by the CAC if it has been handling the "sensitive" personal data of more than 10,000 people since the beginning of the previous year, or if it has handled the personal information of more than 100,000 Chinese citizens.

While the new rules do not specifically mention Hong Kong or Macau, in practice, the two special administrative regions - governed under the "one country, two systems" principle - are often treated as areas outside the Chinese border, meaning that data transfer from the mainland to Hong Kong could potentially come under scrutiny.

"The regulations cast doubt on Hong Kong's status as a gateway to [mainland] China since they apply equally to any transfer of data outside of mainland China, with no exception for transfers to Hong Kong or Macau," said Gabriela Kennedy, a partner at law firm Mayer Brown in Hong Kong.

"All transfers of data outside of mainland China will be assessed on the merits of the individual circumstances, with no clear advantage for a company in Hong Kong over a company with a comparable data protection regime, like, say, Singapore," she added.

For many international businesses using Hong Kong as a hub for Asia and a gateway to the mainland, the new measures mean that storing data in Hong Kong may become more troublesome than keeping the data on the mainland, said Alex Roberts, counsel for technology, media and telecommunications at Linklaters law firm in Shanghai.

"Bigger, data-rich businesses' data flows to Hong Kong could be blocked under the new rules if the Chinese authorities see a national security risk," Roberts said.