Are you asking us or the first one ever? Must be some shared academic work over arpa if you mean in general
Software piracy existed long before the internet and it simply moved from offline copying to bulletin boards to internet-based FTP sites, Usenet and IRC and such once that became common and now I guess mostly P2P.
Bill Gates famously ranted over hobbyists that copied Altair Basic interpreter that he had part in developing back in 1976. Not the first occurance of piracy either, but maybe the first time anyone actually described it as stealing.
The use of the word “piracy” describing unlicensed copying dates hundreds of years back, to book plagiarism and copying. Much later also applied to music bootlegs.
It was almost certainly software like a game
Before even local networking was really a thing, people were pirating games by just sharing the disks
Don’t copy that floppy!
Why again did I need a double tape deck?
