很多软件以取得网卡地址作为License验证，这不失为一个验证合法用户的好办法，不过要付出回复用户电话、传真的代价哦^_^
将下面这段代码拷贝到程序中，然后在你的程序需要的时候调用EthernetAddress(0),该函数返回的字符串就是您机器上网卡的以太序列号。

Private Const NCBASTAT = &H33
Private Const NCBNAMSZ = 16
Private Const HEAP_ZERO_MEMORY = &H8
Private Const HEAP_GENERATE_EXCEPTIONS = &H4
Private Const NCBRESET = &H32

Private Type NCB
ncb_command As Byte
ncb_retcode As Byte
ncb_lsn As Byte
ncb_num As Byte
ncb_buffer As Long
ncb_length As Integer
ncb_callname As String * NCBNAMSZ
ncb_name As String * NCBNAMSZ
ncb_rto As Byte
ncb_sto As Byte
ncb_post As Long
ncb_lana_num As Byte
ncb_cmd_cplt As Byte
ncb_reserve(9) As Byte ' Reserved, must be 0
ncb_event As Long
End Type

Private Type ADAPTER_STATUS
adapter_address(5) As Byte
rev_major As Byte
reserved0 As Byte
adapter_type As Byte
rev_minor As Byte
duration As Integer
frmr_recv As Integer
frmr_xmit As Integer
iframe_recv_err As Integer
xmit_aborts As Integer
xmit_success As Long
recv_success As Long
iframe_xmit_err As Integer
recv_buff_unavail As Integer
t1_timeouts As Integer
ti_timeouts As Integer
Reserved1 As Long
free_ncbs As Integer
max_cfg_ncbs As Integer
max_ncbs As Integer
xmit_buf_unavail As Integer
max_dgram_size As Integer
pending_sess As Integer
max_cfg_sess As Integer
max_sess As Integer
max_sess_pkt_size As Integer
name_count As Integer
End Type

Private Type NAME_BUFFER
name As String * NCBNAMSZ
name_num As Integer
name_flags As Integer
End Type

Private Type ASTAT
adapt As ADAPTER_STATUS
NameBuff(30) As NAME_BUFFER
End Type

Private Declare Function Netbios Lib "netapi32.dll" _
(pncb As NCB) As Byte

Private Declare Sub CopyMemory Lib "kernel32" Alias _
"RtlMoveMemory" (hpvDest As Any, ByVal hpvSource As Long, _
ByVal cbCopy As Long)

Private Declare Function GetProcessHeap Lib "kernel32" () _
As Long

Private Declare Function HeapAlloc Lib "kernel32" _
(ByVal hHeap As Long, ByVal dwFlags As Long, _
ByVal dwBytes As Long) As Long

Private Declare Function HeapFree Lib "kernel32" _
(ByVal hHeap As Long, ByVal dwFlags As Long, lpMem As Any) _
As Long

Private Function EthernetAddress(LanaNumber As Long) _
As String

Dim udtNCB As NCB
Dim bytResponseAs Byte
Dim udtASTAT As ASTAT
Dim udtTempASTAT As ASTAT
Dim lngASTAT As Long
Dim strOut As String
Dim xAs Integer

udtNCB.ncb_command = NCBRESET
bytResponse = Netbios(udtNCB)
udtNCB.ncb_command = NCBASTAT
udtNCB.ncb_lana_num = LanaNumber
udtNCB.ncb_callname = "* "
udtNCB.ncb_length = Len(udtASTAT)
lngASTAT = HeapAlloc(GetProcessHeap(), _
HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY, udtNCB.ncb_length)

strOut = ""
If lngASTAT Then
udtNCB.ncb_buffer = lngASTAT
bytResponse = Netbios(udtNCB)
CopyMemory udtASTAT, udtNCB.ncb_buffer, Len(udtASTAT)
With udtASTAT.adapt
For x = 0 To 5
strOut = strOut & Right$("00" & Hex$(.adapter_address(x)), 2)
Next x
End With
HeapFree GetProcessHeap(), 0, lngASTAT
End If
EthernetAddress = strOut
End Function