The "IP" is the copyrighted handshake that keeps out third party cartridges. Therefore, by necessity any third party cartridges that works is violating their "IP" *taps head*
The PC and print biz is currently facing a class-action lawsuit (from 2.42 in the video below) regarding allegations that the company deliberately prevented its hardware from accepting non-HP branded replacement cartridges via a firmware update.
When asked about the case in a CNBC interview, Lores said: "I think for us it is important for us to protect our IP.
And what we are doing is when we identify cartridges that are violating our IP, we stop the printers from work[ing]."
Lores said of customers who use a third-party cartridge: "In many cases, it can create all sorts of issues from the printer stopping working because the ink has not been designed to be used in our printer, to even creat[ing] security issues.
HP has long banged the drum [PDF] about the potential for malware to be introduced via print cartridges, and in 2022, its bug bounty program confirmed that third-party cartridges with reprogrammable chips could deliver malware into printers.
Sadly, Lores's protestations were somewhat undermined by the admission that the company's business model depends – at least in part – on customers selecting HP supplies for their devices.
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