A friend has HP printers, and bought the wrong print cartridge. It was the right shape, but had 'physical rights management' - tabs that prevented it from fitt

A friend has HP printers, and bought the wrong print cartridge. It was the right shape, but had 'physical rights management' - tabs that prevented it from fitting in the holder. Quite clever. Easily enough modified with a knife, but I was still foiled by DRM.