Following documentation details how to get all (alive or not) MAC Addresses of the physical machine would get added in the Details.properties.
Prior 4050 only the live MAC address of the machine was added in Details.properties. The mentioned MAC address is further used to generate License. If generated only on the live MAC address and if switched on to another MAC address ( Say from WIFI to LAN) in that case license will not work as License was installed only for one MAC adddress which was live at the time installation. So EphesoftLicenseUtil.class has been changed accordingly to generate details of all MAC addresses of the system (available on the system) and being wrtitten to Details.properties file.