Sampling (also known in Hong Kong as secondary creation or second production) changes, edits or adds new elements to an existing song, commonly to express an opinion. According to the Concerned Group for Rights of Derivation Works, "Second production is ubiquitous". Second production is not believed to violate copyright, since its theme (and meaning) are obviously different from the original work. Samplers do not claim that their works are derived from others, but are original (and, therefore, not plagiarism).