The Bitwig project & downloadable remix parts have been provided here only to allow SA subscribers to join the remix competition. When downloading those resources, you've been prompted by the following message :
User License Agreement
_The audio samples, drums & loops / vocals & melodies contained within this resource pack are fully copyrighted
They are not permitted for use within a commercial release and are only provided for the purpose of this remix_
By downloading these resources you agreeing to use these resources for the purpose of this remix submission only
Even if this competition is now over, I think it makes sense to respect those rules, not only in terms of copyright infringement policies, but also to be fair with artist/label who gave access to their track's resources.
I also think that following those common sense & fair rules is a great way to make SA community respectful.