About the film
YP1967 is a 72-minute Hong Kong documentary directed by Can To. The documentary was released in 2017, marking the 50th anniversary of the 1967 Hong Kong riots. It looks back on a group of juvenile prisoners who were involved in the event.
"YP" is the abbreviation for "Young Prisoner", which is also their inmate numbers, while 1967 refers to the year the riots took place.
From the film's Wikipedia article (CC BY-SA 4.0).