Taiwan’s top court ruled that a former senior director of R&D at Taiwan Semiconductor Manufacturing Company stole the trade secrets that enabled Samsung to produce A9 chips for Apple devices, DigiTimes reports. Samsung seemed to have lost Apple’s chip business to TSMC in 2013, when Apple signed a three-year deal with TSMC to produce its A8 and A9 chips. But after ex-TSMC employee Liang Mong-song allegedly helped Samsung shrink the size of the transistors in its chips, Apple turned back to Samsung to produce the A9 chip earlier this year. A report compiled by third-party experts shows that while older Samsung chips are very different in design from TSMC’s chips, newer models are almost impossible to tell apart. “It could be hard to tell (if the product) came from Samsung or TSMC if only structural analysis is used,” the report states. Liang taught at a Samsung-sponsored university in South Korea after leaving TSMC’s advanced modules technology division, then became CTO of Samsung’s system LSI division in July 2011. TSMC sued Liang in 2011 over trade secrets, and this latest ruling prohibits Liang from working for Samsung in any form until December 31, 2015. [via 9to5Mac]