(57) ABSTRACT A method for decoding auxiliary data from media signals in multimedia
content decodes watermarks from different media Signals and uses the watermarks to …

(57) ABSTRACT A method for tracking media signals in multimedia content is provided by
uniquely identifying the multimedia content With a digital Watermark identi? er. A video …

Digital watermark methods for encoding auxiliary data into a host signal are used to
authenticate physical and electronic objects. One Such method computes a content specific …

(57) ABSTRACT A method for applying a digital watermark to a content Signal is disclosed.
In accordance with Such a method, a watermarking key is identified. The watermarking key …

The disclosure describes methods for using digital water marking to authenticate digital
media signals, such as images, audio and video signals. It also describes techniques for …

(57) ABSTRACT A method for applying a digital watermark to a content signal is disclosed.
In accordance with such a method, a watermark ing key is identi? ed. The watermarking key …

3,947,825 A 3, 1976 Cassada 3,984,624 A 10/1976 Waggener 3,986,624 A 10/1976 Cates,
Jr. et al. 4,038,596 A T. 1977 Lee 4,200,770 A 4, 1980 Hellman et al. 4,218,582 A 8, 1980 …

3,984,624 A 10/1976 Waggener 3,986,624 A 10/1976 Cates, Jr. et al. 4,038,596 A T. 1977
Lee 4,200,770 A 4, 1980 Hellman et al. 4,218,582 A 8, 1980 Hellman et al. 4,339,134 A 7 …

The invention provides methods and systems for detecting and characterizing alterations of
media content, such as images, video and audio signals, using Watermark messages to …

The invention provides methods and Systems for detecting and characterizing alterations of
media content, Such as images, Video and audio Signals, using watermark messages to …