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How do cannon makes their ink cartridges that no other ink cartridge will work with their printers?

How do cannon makes their ink cartridges that no other ink cartridge will work with their printers?My refiled cartridge didn't working and printer software says it's can't recognized it.

Public Comments

1. it is actually very interesting,i refile myself in home & always first 2-3 times is ok just after this few times it could'nt recognize carteridge.im looking for answer too!!!
2. ALL the printer companies do this. The printer polls the chip regularly. When it is empty it sends a signal to the chip. Unless you use a chip resetter, refilling won't work. Anyway, refilling is a dangerous practice. It may work a few times but the one time it fails will cost you more than anything you saved. Look at http://ccs-digital.com/refills.html for details. Using new compatible cartridges is a good way to save money. Someone I know brought their Canon printer to the authorized Canon repair center. When they picked it up, the tech wanted to demonstrate that it worked but it was out of ink. He put in new cartridges and the person noticed they were NOT Canon! He asked the tech why they were using non-Canon cartridges and he answered they worked just as well and were cheaper.