NetSeal_Helper.NetSeal.LicenseManager.LicenseWriter.InternalWriteLicense C# (CSharp) Method

        private void InternalWriteLicense(string filePath, string netsealId, LicenseFile licenseFile, FileAttributes attributes)
        {
            using (var memoryStream = new MemoryStream())
            {
                using (var binaryWriter = new BinaryWriter(memoryStream))
                {
                    binaryWriter.Write(licenseFile.GUID);
                    binaryWriter.Write(licenseFile.Unknown);
                    binaryWriter.Write(licenseFile.Remember);
                    if (licenseFile.Remember)
                    {
                        binaryWriter.Write(licenseFile.Username);
                        binaryWriter.Write(licenseFile.Sha1Password);
                    }
                }

                byte[] derivation = null;

                if (licenseFile.Framework == LicenseFramework.Framework2_0)
                    derivation = GetDerivationFr2_0(netsealId);
                else if (licenseFile.Framework == LicenseFramework.Framework4_5)
                    derivation = GetDerivationFr4_5(netsealId);
                else
                    throw new Exception("License Framework");

                var encrypted = EncryptLicense(memoryStream.ToArray(), derivation);

                if (attributes == 0)
                    attributes = FileAttributes.Hidden | FileAttributes.NotContentIndexed | FileAttributes.ReadOnly | FileAttributes.System;

                if (File.Exists(filePath))
                    File.SetAttributes(filePath, FileAttributes.Normal);

                File.WriteAllBytes(filePath, encrypted);
                File.SetAttributes(filePath, attributes);
            }
        }