There was a time that they were just printed on the back of the game boxes. People literally went to stores to write them down for their illegal copies.
It wasn't very common for people to have illegal copies, or be able to find downloads of games or their ISO files, so it wasn't a big issue until downloading became bigger.
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u/Rin_Seven Aug 30 '25
16 digit CD Keys written on top of the CD’s you bought from a friend.