Both steganography and digital watermarking employ steganographic techniques to embed data covertly in noisy signals. Even using the simple watermarking method described, it can be difficult to distinguish some watermarks. That is the key difference between steganography and digital watermarking. Although steganography and digital watermarking seem similar, they are not. Digital watermarking is distinctly different from data hashing. A watermarking system is usually divided into three distinct steps, embedding, attack, and detection. Research papers about DICOM and digital watermarking used XnView for image processing. The two leading methodologies are acoustic fingerprinting and watermarking. ATSC 3.0 supports digital watermarking of the audio signal and video signal. Digital watermarking techniques may be classified in several ways. Hardware watermarking can be used in conjunction with hardware obfuscation. One application of digital watermarking is "source tracking". One of the most secure techniques of audio watermarking is spread spectrum audio watermarking (SSW). Handles are being used in digital watermarking applications, GRID applications, repositories, and more. Watermarking technology is utilized in media protection field to trace where illegal copies originate.