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Maybe they have some nice IP and few patents that Apple would like to use against the A4 or future chip designs.

• wlievens 16y ago
  A4 is ARM based
• masklinn 16y ago
  I'm sure they have nice IP, but the point is that IP is embedded in the designs they produce which anybody can license, and which Apple already licenses, at least in part (the A4 is based on the Cortex A8, which is an ARM-designed core)