Effective robust patchwork method to the vulnerable attack for digital audio watermarking SCOE ELECTRONICS AND TELECOMMUNICATION ENGINEERING Page 1 CHAPTER 1 INTRODUCTION In recent years, audio watermarking techniques have achieved significant progress, and several good algorithms for embedding watermarks into audio data have been presented a watermarking procedure to embed watermark by directly modifying the audio samples. In recent years, there has been increasing research interest in the protection of digital media concerning intellectual property rights. Digital watermarking is a promising technique to solve this problem. From the technical aspect, digital watermarking aims to embed proprietary data (such as signature, logo, ID number, etc.) into the media object. When necessary, the owners can extract these data to declare their copyright .While digital watermarking can be applied to various multimedia data such as audio, image, and video. This paper limits its attention to audio watermarking. Since an audio signal contains only one-dimensional data and the human auditory system is more sensitive than the visual system, it is more difficult to hide additional information into an audio signal than into other multimedia data, without lowering the quality of the media object. An effective and practical audio water marking method should possess three important traits: imperceptibility, robustness, and security. Imperceptibility means that the watermark should be inaudible in the watermarked audio signal. Robustness indicates the ability of recovering the watermark data from the watermarked signal, both in the situations with and without attacks. Security ensures that an unauthorized user cannot extract or delete the watermark without using a secret key. In addition, low computation complexity is also considered as an advantage since it reduces the time of watermark embedding and extraction. This feature is particularly important for some time-demanding applications, such as delivering the audio data over the Internet. 1.1 Problem Statement In communication network advance technology facilitate reproduction, manipulation of digital media without signal degradation this gives the strong demand for the digital protection of intellectual property. To protect the digital content there is need to resist the various attack from network. To overcome this problem : 1. Protection against the intellectual property is miserably important.