How are audio files watermarked?
Audio watermarking can be done in many different ways, but generally consists of the insertion of spoken word (saying something like 'preview' or similar), sound effects or music into an audio file before exporting it. This makes it difficult for anyone to rip or steal it and pass it off as their own.
What is a watermark on an mp3?
An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph.