Lockout chip
In a general sense, a lockout chip is a chip within an electronic device to prevent other manufacturers from using a company's device to perform certain functions.
A notable example is the lockout chip found in Nintendo's Nintendo Entertainment System, designed to prevent "unlicensed" manufacturers from creating games for the console. The presence of the chip forced unlicensed companies to raise the price of each cartridge, and allowed Nintendo a foothold for a lawsuit.
Lockout functions are commonly used in printers to prevent the manufacture of third-party ink or toner cartridges.
