This tool helps user watermark the images using their private key and verify the ownership of the images by reading the watermarked images. A user friendly graphical user interface has been provided for ease of use. The application can be launched simply by typing "python gui.py" on the terminal in Windows.

Please note that "testkey.pem" is a sample private key provided for showcasing the usage of this tool. User can create their own private key as needed. Private keys can be in PKCS#1 or PKCS#8 in binary or PEM encoding. It can also read OpenSSH text keys.