WATERMARKING AND FINGERPRINTING DIGITAL CONTENT USING ALTERNATIVE BLOCKS TO EMBED INFORMATION

摘要

A method of embedding information in digital content representing media streams. The method includes selecting a set of locations within that digital content representing the media stream to embed information (601), selecting a set of possible alteration to make at those locations (602), and making a subset of the possible alterations. The set of locations and possible alteration is herein sometimes called a "watermark". The subset of actual alterations that are made is herein sometimes called a "fingerprint". The method determines a set of locations at which there are alternative versions of digital content (603) representing the same media stream.