I'm assuming this is almost similar to attempts to use copyright law to stop the sale of products on the grey market. http://www.bipc.com/court-rebuffs-attempt-to-use-copyright-l...
I do wonder though, if they changed the underlying software on the cartridges they would get into trouble. I do not see this stopping John Deere's practice of locking up their hardware through copyright laws. https://www.wired.com/2015/02/new-high-tech-farm-equipment-n...