Per Japanese Article 175 of the Penal Code, all official JAV releases include "mosaics." If a video is labeled "un-censored," it is usually an unauthorized leak or a digitally altered version.
The reason users search for strings like "juq-741-rm-javhd.today01-59-00 Min" is due to the highly organized nature of the industry. Unlike Western adult media, which often relies on descriptive titles, the JAV market uses these codes to help viewers find: juq-741-rm-javhd.today01-59-00 Min
Fans often follow "exclusive" performers who only work with certain labels. Per Japanese Article 175 of the Penal Code,