i was just wondering if it is possible to have a song file at say 128 kbps under CC license and have another file (of the same song) at say 256kbps under Copyright (the usual “all rights reserved” one).. and both files are of the same recording….. ??

is it possible in general? or is it possible on this site?

If you’re asking the first question you should ask here.

If you’re asking the second question the answer is no.