$10 Quake shareware CD locked copies of all id Software games behind a flawed encryption scheme — pay-over-the-phone system only held up for 39 days after 1996 release, leaving developer with 150,000 discs it couldn't sell

id Software included locked versions of its entire game library on the $10 Quake shareware CD it released in 1996. But the system meant to allow gamers to pay for and unlock those titles over the phone proved vulnerable to crackers who discovered a way to unlock every game on the disc for free.