I own a secondhand Brother inkjet printer. I bought it on eBay under the influence of posts like these. TLDR, they now DRM their cartridges. Each ink cartridge

I own a secondhand Brother inkjet printer. I bought it on eBay under the influence of posts like these. TLDR, they now DRM their cartridges. Each ink cartridge has a chip in it. One of the first experiences I had was my printer refusing a back ink cartridge. I had to throw away a full cartridge.