The MAC address of the network adapter is a good criteria because it is still available after a reinstallation of a machine and is independent of disk imaging. Adapters for VPN and dial-up modem adapters are not used because they are not available without internet connect.
There are a few things to be considered as well as in a server environment as for single user installations.
If a mobile PC has a W-LAN adapter and is in battery mode without a W-LAN connection, then often the W-LAN adapter is disabled to save battery. On a system with Vista and Windows 8 / 10, Licence Protector 5 can retrieve the disabled adapter but not on Windows XP. A disabled adapter on Windows XP results in a copy protection error.
The same situation occurs when a network cable is unplugged.
Switch to Netbiosname on single user maschines or hostname.
If a server has more then one adapter and some PCs access the server through adapter 1, some through adapter 2, then a copy protection violation will occur. In this case we recommend switching to the criteria Volume ID + UNC Pathname.
In a subnet portioned network environment the MAC address should not be used. All PCs in outer-subnets can not retrieve the MAC address. Switch to Volume ID or Hostname in comibnation with UNC path as mean of copy protection.
Licence Protector 5 can be used on a Novell server for licensing, but the Software Copy Protection will not work because the hardware information like Volume ID or MAC address can not be retrieved from the server.
If a PC has multiple network adapters and is offline, the same situation occurs like described above with W-Lan Adapters.
If a PDA with an inbuilt network adapter is connected to the PC during the activation is done, then it could happen that this network adapter is used because the network adapter of the PDA is added to the PCs network adapters. The PDA should be disconnected and then the MAC address can be used for copy protection.
Pros/Cons
+ After reinstallation of Windows, the MAC address does not change
+ If an image tool is used, the MAC address is still different
+ Good within a network because the MAC address must be unique
- See considerations above for multiple network cards
- Allows to install the application multiple times on the same server / computer
Recommendation
Should be used for enterprise users because disk imaging is often used to set up multiple machines and a reinstallation of Windows does not need a new licensing.