Audio Files Protection Using Logo Watermarking, Fingerprinting and Encryption

Logo watermarking and fingerprinting algorithms are combined with encryption for protection of audio files. Graphical signs are embedded directly in the spectrogram, and may be visualized using any audio editing software. Fingerprinting is based on long pseudorandom sequences perceptually filtered using an adaptive zero-phase filter. Fingerprints may be embedded at receiver side, if an encrypted copy of the original audio file is transmitted. Logo watermarks and fingerprints are robust to MP3 noise attacks. Fingerprints are robust to linear and some nonlinear collusion attacks (more than 20 colluders) combined with MP3 noise attacks.