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SPREAD SPECTRUM COPYRIGHT PROTECTION FOR MULTIMEDIA

IP.com Disclosure Number: IPCOM000008024D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-13

Publishing Venue

Motorola

Related People

Authors:
Philip C. Blum Mark S. Nowak

Abstract

We describe a digital copyright protection method for use in multimedia data such as audio, still-frame imagery and video. The method provides a virtually undetectable means of modifying the original data in an imperceptible manner for copy- right enforcement and tracking of copyrighted material. The copyright provides a means to track reproduction (authorized or unauthorized) and retransmission of digital multimedia information. The original audio, still-image, or video can be nearly perfectly reconstructed, if desired. The method is robust to signal distortions and degrada- tion, common signal processing operations (e.g., fil- tering, resampling, requantization, and redigitiza- tion), noise forgery, and attack.