Quote:
Originally Posted by barryem
He sent me 2 short audiobooks, one watermarked to me and one not. He asked me to do my best and send them back and he would tell me which was which. I converted them and sent in the copies, thinking I was very smart, and he identified them correctly. 50/50 chance so we did it again. After the third time I decided he was right.
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It could have been something like undetectable low or high frequency tones at the beginning or ending of the book, or in the "silences" for example. You should have opened it up with an audio-editor, and run a high and low pass filter over it
(Or replace half of the books with static and send it back like that. "Huh? Static? No... I don't hear anything strange?
)
Just a guess, though. I don't know anything about audio watermarking.