The legal crux seems to rely on if a significant amount of the original work has changed or been put into different context that sets it apart from the original

The legal crux seems to rely on if a significant amount of the original work has changed or been put into different context that sets it apart from the original work. Examples being Vanilla Ice vs Bowie & Queen, and Girltalk/Illegal Art [1] [1] http://illegal-art.net/girltalk http://illegal-art.net/girltalk