There was a time when PCB layout designers worked from schematics that were usually drawn in a meaningful way so as to show circuit functionality and to be readable.
PCB copy board is through technical means to copy the pcb circuit board, the difficulty is relatively large, it can be said to be sophisticated technology, copy board is not always used to do piracy.
Reverse engineering things is a fun hobby. It enables someone like myself who is intensely curious about all things and how they function to understand the design of things.