Does the U1MS watermark MP3s?

Simple question. Are the MP3s we download from the store 'tagged' in some way to make them globally unique?

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Ubuntu One for Rhythmbox Edit question
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Solved by:
Alan Pope 🍺🐧🐱 πŸ¦„
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Alan Pope 🍺🐧🐱 πŸ¦„ (popey) said :

I may be answering my own question here...

I just found someone who has downloaded a track from 7digital and I have bought it from U1MS.

20:54:17 <@popey> alan@wopr:~/.ubuntuone/Purchased from Ubuntu One$ sha1sum Amy\ MacDonald/This\ Is\ The\ Life/This\ Is\ The\ Life.mp3
20:54:17 <@popey> b576a6695cce410521c862301f74deeb3ced22e4 Amy MacDonald/This Is The Life/This Is The Life.mp3
20:59:38 <+Dee> [dee@jane Dropbox]$ sha1sum Amy\ MacDonald\ -\ This\ Is\ The\ Life.mp3
20:59:38 <+Dee> b576a6695cce410521c862301f74deeb3ced22e4 Amy MacDonald - This Is The Life.mp3