System.ComponentModel.LicenseManager.LicenseInteropHelper.RequestLicKey C# (CSharp) Method

            private static int RequestLicKey(RuntimeTypeHandle rth, ref IntPtr pbstrKey)
            {
                Type type = Type.GetTypeFromHandle(rth);
                License license;
                string licenseKey;

                // license will be null, since we passed no instance,
                // however we can still retrieve the "first" license
                // key from the file. This really will only
                // work for simple COM-compatible license providers
                // like LicFileLicenseProvider that don't require the
                // instance to grant a key.
                //
                if (!LicenseManager.ValidateInternalRecursive(LicenseManager.CurrentContext,
                                                              type,
                                                              null,
                                                              false,
                                                              out license,
                                                              out licenseKey))
                {
                    return E_FAIL;
                }

                if (licenseKey == null)
                {
                    return E_FAIL;
                }

                pbstrKey = Marshal.StringToBSTR(licenseKey);

                if (license != null)
                {
                    license.Dispose();
                    license = null;
                }

                return S_OK;
            }