The purpose of this study was to test to what extent watermarks embedded in distorted audio signals are immune to audio restoration algorithm performing. Several restoration routines such as noise reduction, spectrum expansion, clipping or clicks reduction were applied in the online website system. The online service was extended with some copyright protection mechanisms proposed by the authors. They contain low-level music features embedded as watermarks using the non-blind approach. After applying restoration algorithms, the watermark is extracted from the audio track. It was shown in experiments, that a watermark “attacked” by the restoration procedures may still be detected. However in some cases it is possible to retrieve only a binary information about the watermark presence in the audio carrier.
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