Printer manufacturers use DRM chips, known as CRUM, to restrict the use of third-party toner cartridges and ensure recurring revenue. These chips evolved from simple EEPROM counters to complex systems like the Atmel AT88SC0204C and custom Samsung microcontrollers, which utilize encryption and one-time programmable memory to prevent cloning.
In 2009, Andrey Lutov from Donetsk developed a method to bypass these protections for the Samsung SCX-4300 printer. By modifying the firmware to reset internal EEPROM settings and blocking the CRUM chip communication, he allowed the printer to operate indefinitely without original cartridges. This firmware was initially released for free on the testcopy.ru forum.
The success of this modification led to a commercial ecosystem where researchers created custom firmware for various models. To combat unauthorized redistribution, developers introduced 'single-device' firmware, which links the software to a specific printer's serial number. This shift created a recurring revenue model for developers, as service centers had to purchase a unique patch for every individual machine.
