>I thought this was illegal and why the third party cartridge market is so big. Are you talking about the Lexmark case? That was the Supreme Court ruling agai

>I thought this was illegal and why the third party cartridge market is so big. Are you talking about the Lexmark case? That was the Supreme Court ruling against Lexmark's claim of patent infringement by a 3rd-party ink refiller.[1] That ruling doesn't apply to 1st-party manufacturers using electronics/software/DRM to make 3rd-party accessories incompatible. That's why it's currently legal for Apple's T2 chip to not validate 3rd-party repairs and Keurig coffee maker to check for approved K-Cups. [1] https://www.google.com/search?q=impression+vs+lexmark https://www.google.com/search?q=impression+vs+lexmark