ESF sampled the sounds from a copyrighted source anyway. As long as one avoids commercial use, I'm pretty sure you are not not violating the original license (although exhibition terms remain iffy since the rise of internet). This in effect is essentially a Creative Commons. Hell, even I employed heavy use of DBZ samples when I first started producing music on a computer and I guarantee you many of those were from ESF to save myself recording time. These tracks (and other peoples work) have been on the internet for a decade, including this very forum, and have never been an issue for me, the Devs, or Toei. Why would it now?