HP is preventing more customers from using third-party ink with their printers. Numerous reports scattered across Reddit, Twitter, and the HP community forum suggest that a recent printer firmware ...

HP sells printers that work with third-party ink now, but the company says it may update them in the future to "block cartridges using a non-HP chip or modified or non-HP circuitry from working in ...

HP printers with dynamic security that can be disabled depending on the date of manufacture: HP Officejet Pro 6970, 7740, 8210, 8700, Officejet 6950, PageWide 300, 400, and 500 printers.

For a company like, say, 123inkt, the Dutch outfit that sells HP-compatible cartridges and first noticed the change, it's DRMaggedon. HP's at least upfront about it. Brazen, even!

As of April 2013, HP offers the 94/95 injket cartridge combo-pack for between $48 and $53, while the 96/97 package goes for about $67 to $73. You can find either pack on HP's website, or at both ...