HP PageWide Enterprise Color MFP 780dn - multifunction printer - color

Modern business demands forward-thinking technology-it's why HP engineered the next generation of HP PageWide Enterprise to deliver a competitive edge from every angle: lowest color cost, maximum uptime, and the industry's strongest security.

Dynamic security enabled printer

Certain HP printers are intended to work only with cartridges that have a new or reused HP chip or electronic circuitry. These printers use dynamic security measures to block cartridges using a non-HP chip or electronic circuitry. Periodic firmware updates will maintain the effectiveness of these measures and block cartridges that previously worked. Reused HP chips and electronic circuitry enable the use of reused, remanufactured, and refilled cartridges.

http://www.hp.com/learn/ds.