A different type of bootlegging: in the USSR and Eastern Europe in the 1950s underground night spots would play music pirated from the west. The only media they had were records etched into discarded X-ray film.
(…) enterprising young people with technical skills learned to duplicate records with a converted phonograph that would “press” a record using a very unusual material for the purpose; discarded x-ray plates. This material was both plentiful and cheap, and millions of duplications of Western and Soviet groups were made and distributed by an underground roentgenizdat, or x-ray press (…)
Further reading on underground music in the Soviet era.