Mastercam uses sophisticated software protection (often via HASP USB keys or digital licensing) to verify that a seat is legal. The "Not Genuine" warning is triggered when:
The presence of a "HASP emulator" or its leftover registry entries is a frequent cause of the "not genuine" bar. this copy of mastercam is not genuine
Non-genuine copies are notorious for crashing during complex toolpath generations, leading to lost work. leading to lost work.