This interface is used to instantiate a COM Object with a licence key

C# Definition:

[ComImport]
[Guid("B196B28F-BAB4-101A-B69C-00AA00341D07")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IClassFactory2
{
   /// <summary>
   /// the standard create instance (without licence)
   /// </summary>
   /// <param name="unused">must be set to null</param>
   /// <param name="iid">the Guid of the COM class to create</param>
   /// <returns>an instance of the COM class</returns>
   [return: MarshalAs(UnmanagedType.Interface)]
   Object CreateInstance(
     [In, MarshalAs(UnmanagedType.Interface)] Object unused,
     [In, MarshalAs(UnmanagedType.LPStruct)] Guid iid);

   void LockServer(Int32 fLock);

   IntPtr GetLicInfo(); // TODO : an enum called LICINFO

   [return: MarshalAs(UnmanagedType.BStr)]
   String RequestLicKey(
     [In, MarshalAs(UnmanagedType.U4)] int reserved);

   /// <summary>
   /// create an instance of the COM class thanks to a licence key
   /// </summary>
   /// <param name="pUnkOuter">don't know what it is, set to null</param>
   /// <param name="pUnkReserved">must be set to null</param>
   /// <param name="iid">the Guid of the COM class to create</param>
   /// <param name="bstrKey">the licence key</param>
   /// <returns>an instance of the COM class</returns>
   [return: MarshalAs(UnmanagedType.Interface)]
   Object CreateInstanceLic(
     [In, MarshalAs(UnmanagedType.Interface)] object pUnkOuter,
     [In, MarshalAs(UnmanagedType.Interface)] object pUnkReserved,
     [In, MarshalAs(UnmanagedType.LPStruct)] Guid iid,
     [In, MarshalAs(UnmanagedType.BStr)] string bstrKey);
}

VB Definition:

    <ComImport>
    <Guid("B196B28F-BAB4-101A-B69C-00AA00341D07")>
    <InterfaceType(ComInterfaceType.InterfaceIsIUnknown)>
    Interface IClassFactory2
    Function CreateInstance(<MarshalAs(UnmanagedType.[Interface])> unused As Object,
                <MarshalAs(UnmanagedType.LPStruct)> iid As Guid) As <MarshalAs(UnmanagedType.[Interface])> Object
    Sub LockServer(ByVal fLock As Int32)
    Function GetLicInfo() As IntPtr
    Function RequestLicKey(<MarshalAs(UnmanagedType.U4)> reserved As Integer) As <MarshalAs(UnmanagedType.BStr)> String
    Function CreateInstanceLic(<MarshalAs(UnmanagedType.[Interface])> pUnkOuter As Object,
                   <MarshalAs(UnmanagedType.[Interface])> pUnkReserved As Object,
                   <MarshalAs(UnmanagedType.LPStruct)> iid As Guid,
                   <MarshalAs(UnmanagedType.BStr)> bstrKey As String) As <MarshalAs(UnmanagedType.[Interface])> Object
    End Interface

    <Flags>
    Enum CLSCTX As UInteger
    CLSCTX_INPROC_SERVER = &H1
    CLSCTX_INPROC_HANDLER = &H2
    CLSCTX_LOCAL_SERVER = &H4
    CLSCTX_INPROC_SERVER16 = &H8
    CLSCTX_REMOTE_SERVER = &H10
    CLSCTX_INPROC_HANDLER16 = &H20
    CLSCTX_RESERVED1 = &H40
    CLSCTX_RESERVED2 = &H80
    CLSCTX_RESERVED3 = &H100
    CLSCTX_RESERVED4 = &H200
    CLSCTX_NO_CODE_DOWNLOAD = &H400
    CLSCTX_RESERVED5 = &H800
    CLSCTX_NO_CUSTOM_MARSHAL = &H1000
    CLSCTX_ENABLE_CODE_DOWNLOAD = &H2000
    CLSCTX_NO_FAILURE_LOG = &H4000
    CLSCTX_DISABLE_AAA = &H8000
    CLSCTX_ENABLE_AAA = &H10000
    CLSCTX_FROM_DEFAULT_CONTEXT = &H20000
    CLSCTX_INPROC = CLSCTX_INPROC_SERVER Or CLSCTX_INPROC_HANDLER
    CLSCTX_SERVER = CLSCTX_INPROC_SERVER Or CLSCTX_LOCAL_SERVER Or CLSCTX_REMOTE_SERVER
    CLSCTX_ALL = CLSCTX_SERVER Or CLSCTX_INPROC_HANDLER
    End Enum

    <DllImport("ole32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True, PreserveSig:=False)>
    Function CoGetClassObject(<MarshalAs(UnmanagedType.LPStruct)> rclsid As Guid,
                     dwClsContext As CLSCTX,
                     pServerInfo As IntPtr,
                     <MarshalAs(UnmanagedType.LPStruct)> riid As Guid) As <MarshalAs(UnmanagedType.[Interface])> Object
    End Function

User-Defined Types:

TODO : specify struct to replace all IntPtr

Notes:

You can instantiate a IClassFactory2 thanks to the CoGetClassObject (from OLE32.DLL)

The "Object" return by methods can be cast to the specified type.

Exemple :

    String LicenceKey = "haha";
    IClassFactory2 icf2 = Ole32.CoGetClassObject(
        typeof(Interop.MyComLibrary.ComMyLibraryClass).GUID,
        CLSCTX.CLSCTX_LOCAL_SERVER, new System.IntPtr(),
        typeof(IClassFactory2).GUID) as IClassFactory2;
    Interop.MyComLibrary.IMyComClass instance = icf2.CreateInstanceLic(
        null, null, typeof(Interop.MyComLibrary.IMyComClass).GUID, LicenceKey) as Interop.MyComLibrary.IMyComClass;

Example vb.net :

    Dim strLicense As String = "haha"
    Dim classFactory As IClassFactory2 = CoGetClassObject(GetType(ComMyLibraryClass).GUID,CLSCTX.CLSCTX_LOCAL_SERVER,
                                  IntPtr.Zero, GetType(IClassFactory2).GUID)
    Dim instance As IMyComClass = classFactory.CreateInstanceLic(Nothing, Nothing, GetType(IMyComClass).GUID, strLicense)