I guess it shows how out of touch (old) I am that it’s completely bewildering to me that there could be people who do not understand folders … on a computer. Phones, tablets, yeah, I get that, those actively make it harder and harder to access the folder structure. But computers?
The permit requirement does not apply to kitchen knives, does it? Been some time, but I travelled to Tokio quite frequently for work, and always made it a point to go to kappabashi and get a nice cooking knife, some of the longer than 20 cm.