Added copyright notice

Source/ThirdParty/HarmonyLinkLib/include/HarmonyLinkLib.h

@@ -1,4 +1,35 @@
-// Copyright (C) 2023  Jordon Brooks
+// Copyright (c) 2024 Jordon Brooks
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//   http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ * IMPORTANT REMINDER:
+ * Do NOT use standard output functions like std::cout and printf anywhere in this codebase.
+ *
+ * Reason:
+ * Unreal Engine 5's packaging tool encounters issues with these functions, leading to 
+ * packaging failures. The engine sets stdout to UTF-8, which can cause conflicts with
+ * these standard functions, resulting in a "SECURE CRT: Invalid parameter detected" error 
+ * during packaging.
+ *
+ * This issue once required an extensive debugging effort that lasted over 8 hours. 
+ * To prevent similar issues in the future and ensure smooth packaging, always use 
+ * wide-character versions of these functions, such as wprintf and std::wcout, when working 
+ * within the DLL. These functions are compatible with the UTF-8 setting in Unreal Engine 5.
+ *
+ */
+
 
 #pragma once