Know those records that you insert into a vinyl record player? Basically those, but pirated since a real one costs money when you purchase them at official music retailers. It involves the process of obtaining a legal copy then using wax molds (to recreate a record) and specialized tools (prevent quality loss) duplicating the record. (Also, “Bone Music” existed in the Soviet Union by printing music by using x-ray films).
If you buy bootlegs, you won’t easily be able to resell online. I got at least one bootleg, didn’t know it when I bought it, but now it’s forbidden to sell it on a well known international vinyl sales website… Record sounds great tho, so it’s fine.
It’s a copy of Marc Moulin - Sam Suffy by the way.