What limits the speed of light to c and how is it quantized?

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What causes the speed of light to be limited to c? What is it quantized to? Can someone offer more than it being one of the constants of the universe.
 
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Keithinsingapor said:
What causes the speed of light to be limited to c? What is it quantized to? Can someone offer more than it being one of the constants of the universe.
There is nothing special about the actual value of c. The particular numerical value is due to the chosen units of measurement.

So the question is really why is the speed of light limited and not unlimited.