/jp/ - Otaku Culture

>>14368727
It's the code that appears on the side and back of DVD boxes and on the discs to uniquely identify that product. In the pictured example, the code would be NYAN-009.

>>14368790
The code DMM uses is based on the production code, but they sometimes add on letters and numbers and remove the dashes to suit their needs. Sometimes their code is completely different to what appears on the box, so you shouldn't really rely on the DMM URL for determining the production code.

>>14368807
R18 codes are generally the same as on DMM's download section (/digital/). They do differ on DMM's hardcopy section (/mono/), though. But they are all mostly based on the canonical production code which is what you see on the box.