Int 2F Fn 7001  - License Service Api - Request License                    [N]

   AX = 7001h
   CX = license server index (0000h to 001Fh)
   DS:DX -> SLSREQUEST structure (see #2536)

Return: AX = status
       0000h success
       else  provider error code
   ES:BX = provider specific handle for the license context

See Also: AX=7002h,AX=7004h,AX=7005h

Format of License Service SLSREQUEST structure:
Offset Size    Description (Table 2536)
 00h   DWORD   (ret) status code
 04h   DWORD   (ret) handle identifying context
 08h   DWORD   (call) address of Publisher string
 0Ch   DWORD   (call) address of Product string
 10h   DWORD   (call) address of Version string
 14h   DWORD   units required
 18h   DWORD   address of comment string
 1Ch   DWORD   address of SLSCHALLENGE structure (see #2537)

Format of License Service SLSCHALLENGE structure:
Offset Size    Description (Table 2537)
 00h   DWORD   algorithm (currently always 1)
 04h   DWORD   secret to be challenged (1-255)
 08h   DWORD   size of challenge in bytes (1-255)
 0Ch  N BYTEs  challenge data