The Nihon Ethics of Video Association (NEVA) (日本ビデオ倫理協会, Nippon Bideo Rinri Kyōkai, "Japan Video Morality Association"), usually abbreviated as Viderin (official) or Biderin (both: ビデ倫), was a Japanese video rating organization. NEVA was founded in 1972, and it had its headquarters in the Chūō ward of Tokyo. It was a voluntary organization to ensure adherence to Japanese obscenity laws, which prohibit any display of genitals. This is accomplished by a mosaic pixelation that is applied to videos for sale in Japan, and the NEVA seal is placed on all videos produced by member studios, which included the larger and older adult video studios in Japan - including h.m.p., Kuki Inc., and Alice Japan which belonged to NEVA. In recent years, the mosaic has been digitally applied and has become more transparent, and, in June 2007, some restrictions (such as showing pubic hair) were lifted by NEVA.
In response, on August 23, 2007, the Tokyo Metropolitan police raided the offices of NEVA and several AV studios (including h.m.p.) and confiscated videos as part of an investigation of video producers and distributors suspected of distributing obscene material depicting genitals. At the beginning of March 2008, five members of NEVA, including Hiroyuki Gorogawa (五郎川 弘之), the former C.E.O. of h.m.p., one of the board members of NEVA and the head of the inspection division, were arrested for the sale and distribution of indecent material because the digital mosaic used was too revealing. In April 2008, NEVA announced it would be forming a new organization to provide reforms and uniform screening practices for videos.