(57) ABSTRACT A method and system for monitoring and analyzing at least one signal are
disclosed. An abstract of at least one reference signal is generated and stored in a reference …

The implementations of digital watermarks can be optimally Suited to particular
transmission, distribution and storage mediums given the nature of digitally-sampled audio …

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 …

The present invention relates to methods for protecting a data signal using the following
techniques: applying a data reduc tion technique to reduce the data signal into a reduced …

An apparatus and method for encoding and decoding addi tional information into a stream of
digitized samples in an integral manner. The information is encoded using special keys. The …

(57) ABSTRACT A method for combining transfer functions with predeter mined key creation.
In one embodiment, digital information, including a digital sample and format information, is …

(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 …

The present invention relates generally to steganography and digital watermarking. One
method recites: encoding content with a plural-bit digital watermark in accordance with initial …

US PATENT DOCUMENTS are transformed into the frequency domain using a fast Fou rier
transform. A plurality of frequencies and associated amplitudes are identified for each of the …

(57) ABSTRACT A system and methods for permitting open access to data objects and for
securing data Within the data objects is dis closed. According to one embodiment of the …