UMG aren't alleged to use unique watermarks, but to supply
degraded, and audibly degraded files, to online stores that
are not it's own, re:
http://www.hydrogenaudio.org/forums/index.php?showtopic=89818
The argument that Universal doesn't have a good purpose in
doing so is not a rebuttal that they don't do it, and UMG
does not disclose the practice so even calling it
"watermarking" is speculative.
a few quotes from the thread:
"have two FLAC files for the same classical track (Tchaikovsky's 5th
Symphony, Markevitch, on a Philips label). One was purchased from
Passionato, the other was purchased from UMG's web site. Although both
are supposed to be lossless copies of the data on the original CD, the
FLAC file from Passionato actually has a clearly audible sort of
"flutter" in some quiet, sustained passages. It is not the same as the
UMG file. The difference isn't subtle."
"just picked an album at random - Cristóbal de Morales: Music for Philip
II - Requiem - and checked a few of the samples on Passionato's website,
to see if there was any sign of that vibrato-like artifact even in the
samples.
Sure enough, it very much sounded like there was, so I picked track 07 -
where it seemed very pronounced - and downloaded it from both Passionato
and UMG.
I posted the first 15 seconds of each file to mannheim's original upload
thread.
As the kids say these days: O...M...F...G.
The music is just massed male voices, and the vibrato artifact is
incredible, especially around the 0:09 mark.
As expected, the UMG file is perfectly clean, and while I'll leave it to
the end user to do an inverted mix paste in his or her audio editor of
choice, the remaining artifacts are identical in sound to the ones
created from mannheim's sample files.
If that is indeed watermarking being applied by Deutsche Grammophon,
it's shameful - indeed, scandalous, as Wombat said - and whether it's
their fault or not, Passionato really has no right calling those tracks
lossless."
"W/r/t the Universal FLAC issue, Universal audio files purchased from
Passionato are received as FLAC files from UMG. Not all distributors
offer their audio to us in FLAC (some offer WAV or AIFF and we then
convert to FLAC). I strongly suspect the audio artifacts you are hearing
are present in the files we've received from UMG. I will try to pursue
an answer from someone within Universal but I suspect a response will be
unlikely. If I do hear back, I will post a response here."
"AIUI, the audible watermark is only present on digital versions UMG
licenses to other distributors. The OP says the download direct from UMG
itself does NOT have the watermark."