docs: add original author attribution and copyright notice

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
 Copyright (c) 2025 Jad
+Copyright (c) 2024 AllenK (Kwyshell)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -205,15 +205,17 @@ The author does not condone or encourage the misuse of this tool for copyright i
 
 **THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY ARISING FROM THE USE OF THIS SOFTWARE.**
 
-## License
+## Credits
 
-[MIT License](./LICENSE)
+This project is a JavaScript port of the [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool) by Allen Kuo ([@allenk](https://github.com/allenk)).
+
+The Reverse Alpha Blending method and calibrated watermark masks are based on the original work © 2024 AllenK (Kwyshell), licensed under MIT License.
 
 ## Related Links
 
 - [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool)
 - [Removing Gemini AI Watermarks: A Deep Dive into Reverse Alpha Blending](https://allenkuo.medium.com/removing-gemini-ai-watermarks-a-deep-dive-into-reverse-alpha-blending-bbbd83af2a3f)
 
-## Credits
+## License
 
-This project is a JavaScript port of the [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool) C++ implementation.
+[MIT License](./LICENSE)

README_zh.md

@@ -225,15 +225,17 @@ export class WatermarkEngine {
 
 **本软件按“原样”提供，不提供任何形式（无论是明示或暗示）的保证。在任何情况下，作者均不对因使用本软件而产生的任何索赔、损害或其他责任承担任何义务。**
 
-## 许可证
+## 致谢
 
-[MIT License](./LICENSE)
+本项目是 [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool) 的 JavaScript 移植版本，原作者 Allen Kuo ([@allenk](https://github.com/allenk))
+
+反向 Alpha 混合算法和用于校准的水印图像基于原作者的工作 © 2024 AllenK (Kwyshell)，采用 MIT 许可证
 
 ## 相关链接
 
 - [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool)
 - [算法原理说明](https://allenkuo.medium.com/removing-gemini-ai-watermarks-a-deep-dive-into-reverse-alpha-blending-bbbd83af2a3f)
 
-## 致谢
+## 许可证
 
-基于 [Gemini Watermark Tool](https://github.com/allenk/GeminiWatermarkTool) C++ 版本移植
+[MIT License](./LICENSE)