SK Hynix employee sentenced to 18 months for leaking chip technology to Chinese firm

A former SK Hynix employee will serve 18 months in prison after a Seoul High Court upheld the sentence for leaking trade secrets related to CMOS image sensor technology to a Chinese company. The ruling, handed down in August 2026, caps a case that traces back to 2022, when the employee violated internal security protocols at one of the world’s most important chipmakers.

The employee, who worked out of SK Hynix’s China office, printed documents and took photographs of confidential materials stored on the company’s internal server. He then disclosed those details as part of a job application to an undisclosed Chinese firm.

What was stolen and how it happened

CMOS image sensors are the tiny chips that let smartphone and laptop cameras capture images. South Korea classifies CMOS image sensor technology under its industrial technology protection laws, which means leaking it isn’t just a corporate offense. It’s treated as a matter of national security.

SK Hynix operates under strict internal security measures designed to prevent exactly this kind of breach. External storage devices are banned. Printing activity is tracked and logged.

Upon discovery, the defendant admitted to the charges. Authorities were able to recover most of the leaked material, which likely factored into the court’s decision to maintain the original 18-month sentence rather than extend it.

A pattern South Korea is determined to break

In a separate 2024 case, another former SK Hynix employee, a Chinese national, was initially sentenced to 18 months for stealing semiconductor manufacturing documents before taking a position at Huawei. That sentence was later increased to five years on appeal.

The two cases share striking similarities. Both involved former employees exploiting access to SK Hynix’s internal systems. Both targeted technology classified under South Korea’s core national technology laws. And both involved transfers, or attempted transfers, of sensitive information to Chinese entities.

Geopolitics meets corporate security

The US has imposed sweeping export controls on advanced semiconductor technology bound for China. Japan and the Netherlands have followed with their own restrictions. South Korea, home to some of the most advanced chipmaking operations on the planet, sits squarely at the center of this geopolitical chessboard.

The 18-month sentence may sound modest compared to the five-year penalty imposed in the 2024 Huawei-linked case. But it establishes a clear floor: even when the defendant cooperates, even when the stolen materials are recovered, prison time is the baseline outcome.

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