digital watermark audio file

From: Dave Brockman 
Hash: SHA1

For a group of non-technical types, is there a simple way to watermark
an audio file in such that it could be identified back to a unique
copy, and thus the source of a "leak" would be easy to track?  I know
I could overlay (underlay?) a whale farting at different time spots
and track distribution based on the timing of whale flatulence, but
that doesn't fulfill the simple part of the equation.  And I need
something a little less easy to modify than MP3/OGG Tags, etc.
Suggestions (aside from the obvious religious war over which mammal
flatulence should be used), thoughts, experiences, etc welcome....

And to clarify the intended recipients are non-technical, I don't
expect them to replicate this in any fashion, just noting that I don't
expect any of them to 1) know what a spectrogram is 2) be able to
identify an abnormality in a spectrogram.


Version: GnuPG v2.0.17 (MingW32)
Comment: Using GnuPG with Thunderbird -


=============================================================== From: Ed King ------------------------------------------------------ backmasking "microsoft sucks" might work --- On Mon, 5/13/13, Dave Brockman wrote:

=============================================================== From: Jason Brown ------------------------------------------------------ I don't know of any open source / free solutions for this, but there are some paid / proprietary solutions depending on budget. This actually does not look bad:

=============================================================== From: Dan Lyke ------------------------------------------------------ Looks like that latter one can be set up to stuff text into MP3s from a command line. I am not an audio geek, but if I were implementing this sort of thing I'd be looking to encode data on a sub 20Hz or so carrier. That sort of frequency space should be relatively unobtrusive to human listeners, and still be carried through most sorts of lossy transformations (unlike the stuff at the high end of the human perceptual range). Dan

=============================================================== From: Dave Brockman ------------------------------------------------------ -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 It does look interesting, thanks! ...but you play one on the Internet? :) Regards, dtb -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - iQEcBAEBAgAGBQJRkTzeAAoJEMP+wtEOVbcdvAsH/RIzkiRFnVC8fE8HGcaYpi+V 5ybBQfKnnqo1b0uMOzUMWu3fvhQWE1J8M8WWFTtwxcBHRjt2dsFwsr0rRuBM0Zuc zHe0YrR58ILbngrCfJV3kun6pAPsqTDIKyCVBZpkQE2++FczjUyYuQWEuKgfhhe2 vXMP8eyumPvJwugbs7fdFn7y/OECr+l8Q8X2ZzpIpC+UNHflRZ3M/c1Fl2M5NbSI s3NTKF+GIXr2ZHraiyFbr25WEYjiy4EiqTpmv3zbkICFxVNhW4hmEKmsb49/P5/O HEaGPda/IwVXunRQJhd5Nfo+VdgaCKSo5qOWMaJteWJeU9q9ZviM7I+aNIHiMDM= =btzK -----END PGP SIGNATURE-----

=============================================================== From: James Nylen ------------------------------------------------------ From Dan, I take that to mean "I possess only an excellent (not necessarily superhuman) understanding of the topics involved in audio geekery."

=============================================================== From: Dan Lyke ------------------------------------------------------ A little knowledge is a veeeery dangerous thing... Dan