1
Philip R Wiser, Andrew R Cherenson, Steven T Ansell, Susan A Cannon: Secure online music distribution system. Liquid Audio, James D Ivey, May 7, 2002: US06385596 (982 worldwide citation)

A computer implemented online music distribution system provides for the secure delivery of audio data and related media, including text and images, over a public communications network. The online music distribution system provides security through multiple layers of encryption, and the cryptograph ...


2
Steven T Ansell, Andrew R Cherenson, Mark E Paley, Steven B Katz, John Michael Kelsey Jr, Bruce Schneier: Copy security for portable music players. Liquid Audio, James D Ivey, April 2, 2002: US06367019 (257 worldwide citation)

Data such as a musical track is stored as a secure portable track (SPT) which can be bound to one or more players and can be bound to a particular storage medium, restricting playback of the SPT to the specific players and ensuring that playback is only from the original storage medium. The SPT is b ...


3
Steven T Ansell, Andrew R Cherenson: Territorial determination of remote computer location in a wide area network for conditional delivery of digitized products. Liquid Audio, James D Ivey Esq, November 21, 2000: US06151631 (188 worldwide citation)

Digital products are delivered to a client computer through a wide area network such as the Internet only upon determination that the client computer is located in a geopolitical territory, such as a country or state, for which delivery of the digital product is authorized. A server computer estimat ...


4
Earl Levine: Robust watermark method and apparatus for digital signals. Liquid Audio, James D Ivey, February 5, 2002: US06345100 (137 worldwide citation)

Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with a relatively endless stream of pseudo-random bits to form a basis signal, dividing the basis sign ...


5
Earl Levine, Jason S Brownell: Robust watermark method and apparatus for digital signals. Liquid Audio, James D Ivey, March 27, 2001: US06209094 (112 worldwide citation)

Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with a relatively endless stream of pseudo-random bits to form a basis signal, dividing the basis sign ...


6
A Robert Modeste, Gerald W Kearby: Method and apparatus for user controlled modulation and mixing of digitally stored compressed data. Liquid Audio, Fenwick & West, December 22, 1998: US05852800 (75 worldwide citation)

A method and apparatus for generating a summation signal by programmably modulating the intensity levels of a plurality of associated channels of a selection and combining the modulated segments into a unified digital record. A pre-established and user modifiable set of channel intensity levels is p ...


7
Earl Levine: Efficient watermark method and apparatus for digital signals. Liquid Audio, James D Ivey Esq, April 17, 2001: US06219634 (70 worldwide citation)

Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with a relatively endless stream of pseudo-random bits to form a basis signal, dividing the basis sign ...


8
Philip R Wiser, Andrew R Cherenson, Tze Yee Szeto: System and method for secure transfer of digital data to a local recordable storage medium. Liquid Audio, James D Ivey, December 11, 2001: US06330675 (68 worldwide citation)

A device securely decrypts and writes an encrypted digital file to a local recordable storage medium. The device uses two decryption engines. The first decryption engine incrementally decrypts the encrypted digital file, which is then preprocessed and re-encrypted to form an intermediate file. The s ...


9
Scott Nathan Levine: Audio encoding apparatus and methods. Liquid Audio, James D Ivey, July 24, 2001: US06266644 (61 worldwide citation)

An audio encoding system includes quantization, phase matching, compressed domain processing and other improvements enabling high fidelity, low bit rate encoding systems to be formed. In a preferred embodiment a novel transient detector is used to divide an audio source into transient, low frequency ...


10
Earl Levine: Lossless data compression with low complexity. Liquid Audio, James D Ivey, September 26, 2000: US06125348 (46 worldwide citation)

An adaptive linear predictor is used to predict samples, and residuals from such predictions are encoded using Golomb-Rice encoding. Linear prediction of samples of a signal which represents digitized sound tends to produce relatively low residuals and those residuals tend to be distributed exponent ...