> Which now makes me wonder why HP printers do not require special HP paper. in the case of cartridges, the Hé cartridges came first, then the compatible ones.

> Which now makes me wonder why HP printers do not require special HP paper. in the case of cartridges, the Hé cartridges came first, then the compatible ones. In the case of paper, it existed before HP printers. See also Keurig capsules and water.