Thats a good question.

So when Size Triple d sampled nobody listens to techno from eminems song do you think they had to get it licensed and part of the sales went to them or did they just make it and release it with no info on the record.

I was wondering the same about the one Chris Lib and crew did on Yolk.
Same song sampled . (Without Me/M&M)

I mean i can understand if you alter the audio enough and make it sound like something totally different then you probably wouldnt sweat it but when its obvious that its a sample do you need a license to use it?