Change MAC address on PE 2950

Hello,

I know it's a stupid question, but how to change a MAC address on a PE 2950 (broadcom NIC)? I googled for an answer but could not find any.

The machine used to run a licensing system, linked to the MAC address. The licensing system has been virtualized, so I had to use that same MAC on the VM. Now I need to assign a new MAC to my machine before I can use it.

TIA,

Olivier