Sound and Video

audiowmark - Audio watermarking tool

License: GPLv3+
Vendor: Alcance Libre, Inc.
audiowmark is an Open Source (GPL) solution for audio watermarking.

A sound file is read by the software, and a 128-bit message is stored in a watermark in the output sound file. For human listeners, the files typically
sound the same.

However, the 128-bit message can be retrieved from the output sound file. Our
tests show, that even if the file is converted to mp3 or ogg (with bitrate 128
kbit/s or higher), the watermark usually can be retrieved without problems. The
process of retrieving the message does not need the original audio file (blind

Internally, audiowmark is using the patchwork algorithm to hide the data in the
spectrum of the audio file. The signal is split into 1024 sample frames. For
each frame, some pseoudo-randomly selected amplitudes of the frequency bands of
a 1024-value FFTs are increased or decreased slightly, which can be detected

Packages [443 KiB] Changelog by Joel Barrios (2020-08-07):
- Update to 0.5.0.

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