Video and Audio Hybrid Watermarking: A Literature Review

Watermarking is used widely to secure and authenticate the digital data. Different watermarking techniques are used to protect the data from unauthorized attackers. Some are discussed the audio watermarking and some about video watermarking, But meanwhile, these methods only protect the data for some geometric attacks only. To reduce piracy and these attacks we apply a watermark to data. Most recently hybrid techniques are more robust to attacks. These hybrid techniques are DCT-DWT, DWT-SVD. In most recent techniques DWT- SVD is more robust technique so far.