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Dell Latitude - Ethernet MAC address change???

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Last Modified: 2013-12-09
One of our Dell Latitude D630 laptops was transferred to a new user, and before I gave it to the new user, I wanted to re-install Windows on it and give the new user a "clean" installed system.  The problem is, we have a software tool that uses the MAC address of the Ethernet adapter to verify a license file.  I have never heard of or seen a MAC address change on an Ethernet adapter before, but after the windows install, it appears the MAC address HAS changed!?  Is this normal?  Maybe because it's a Dell laptop, the Ethernet adpater is some sort of virtual adapter, and there isn't a mac address burned into it?  
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