A device to apply a digital fingerprint to a digital signal comprises a means of intercepting or acquiring a signal, a storage element and a processor for executing computer implemented programme code components in the storage element to effect the methods. The methods include transforming a plurality of signal samples onto a discrete orthonormal basis and ranking the transformed samples according to their magnitude. The n largest principal components of the ranked transformed samples are optionally permuted to generate a re-ordered set of principal components, which are then altered by a marking angle. The marked principal components and unmarked non-principal components are converted and combined and applying an inverse of the transform function to the combined principal and non-principal components to generate a fingerprinted digital signal. Methods to prepare the signal for marking, recover the digital fingerprint and verify the distributor and/or recipients of the signal are also disclosed.
申请公布号
WO2013067589(A1)
申请公布日期
2013.05.16
申请号
WO2012AU01377
申请日期
2012.11.09
申请人
GAUSS RESEARCH LABORATORY, INC;MORENO DE AYALA, OSCAR;TIRKEL, ANATOL ZYGMUNT