Whether or not a mark is popularly identified as genericized, the owner of the mark may still be able to enforce the proprietary rights that attach to the use or registration of the mark, as long as the mark continues to exclusively identify the owner as the commercial origin of the applicable products or services. If the mark does not perform this essential function and it is no longer possible to legally enforce rights in relation to the mark, the mark may have become generic. In many legal systems (e.g., in the United States but not in Germany) a generic mark forms part of the public domain and can be commercially exploited by anyone. Nevertheless, there exists the possibility of a trademark becoming a revocable generic term in German (and European) trademark law.