TSMC built its dominance not just on cutting-edge fabs, but on closely guarded know-how that rivals cannot easily replicate. Now, that edge is at the center of a high-stakes legal fight. Former senior vice president Wei-jen Lo stands accused of walking out with the crown jewels — key parameters and trade secrets tied to the chipmaker’s most advanced processes — before crossing the Pacific to join rival Intel. The case has landed in Taiwan’s Intellectual Property and Commercial Court, and the outcome could set a precedent for how the island defends its most valuable technological assets.