Video game companies would sometimes (not always!) "watermark" copies of games sent out before release, so that if it leaked they knew the culprit. Here's a fun example in a build I just dumped of Boogerman on the SNES. Left is retail game, right is review copy. 
Update: Motika has been apprehended and is in federal custody
Since y'all are into this, here's my favorite prototype watermark that I've seen, just straight up in your face telling you that they know it's yours so you better not copy it, GAME PLAYERS MAGAZINE.
For the record no one from the magazine leaked this at the time, it was rescued from the trash in much later years.
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