Ah yeah, this article has more information SSJ
According to "plginger," the included tracks were originally torrented FLAC files that Ubisoft seemingly downloaded and converted down into MP3s for the bundle. As seen in this screenshot, the FLAC files were encoded from the original AC3 files found on a console bonus DVD. The deed was performed by well-known internet pirate arsa13, a member of the semi-private BitTorrent tracker Demonoid (screenshot). The FLAC files were reportedly thrown in the BitTorrent pipeline more than four months ago.
While it's possible that Reddit user "plginger" could be pulling a fast one on the community, TorrentFreak believes the claim might be legit, explaining that arsa13's original FLAC torrent somehow left out the "Apple Chamber" track (#20). The screenshot provided by plginger shows that every track distributed by Ubisoft stems from the pirated tracks encoded by arsa13 except for one-- "Apple Chamber." The author's description is left blank.
http://www.tomsguide.com/us/Assassin-s-Creed-FLAC-BitTorrent-Soundtrack-arsa13,news-10485.html
So they literally downloaded the torrent AND ripped the one song it was missing. Making the motivation for doing this even more fucking confusing... since if they had the Master... why didn't they just rip it from the master rather then download the torrented files?!
I mean, i guess either someone was
A) Being veeeeery lazy, then was bummed when he found out a track was missing.
B) Already downloaded it on those servers... and figured "Hey, i've already got most the songs done!".