Seoul court upholds 18-month sentence for SK Hynix trade secret leak to a Chinese firm

Chip trade secret leaks carry prison time in South Korea, and a Seoul appeals court just confirmed it. A former SK Hynix employee was sentenced to 18 months in jail for leaking semiconductor manufacturing information to a Chinese firm, according to Yonhap, reported by Reuters on August 9, 2026. The Seoul High Court heard the appeal and upheld the lower court’s sentence.

What the court found

The information involved CMOS image sensors, the technology behind the cameras in smartphones and laptops. That places the case on the non-memory side of the chip business, rather than the DRAM and NAND lines SK Hynix is best known for.

The court found that the employee, who had worked at the company’s office in China, printed out or photographed documents containing trade secrets downloaded from SK Hynix’s internal server, and disclosed some of that information in a resume submitted to a Chinese company. The receiving company was not named.

The employee admitted all the charges, and most of the information taken was recovered by SK Hynix.

The timeline is the real story

The leak happened in 2022. The sentence was upheld in 2026. That four-year gap between the act and the final ruling is the detail worth sitting with for anyone tracking how chip espionage cases actually resolve.

Semiconductor process knowledge has a shelf life measured in product generations, and a legal process measured in years will always trail the technology it is protecting. By the time an appeals court confirms a sentence, the information in question has often aged past its peak value, and the deterrent effect of the ruling lands on a different generation of engineers than the one that saw the theft.

The mechanics of this case also underline how low-tech exfiltration remains. No sophisticated intrusion, just printed pages, photographed screens and a resume used as a delivery vehicle. For companies sitting on process secrets, the exposure is less about network security than about what an employee with legitimate access chooses to carry out the door.