Section 2 of 6
Designed, not accidental
Pairing, firmware and the sealed enclosure. 3 pieces sit in this section; the whole roster is on the archive.
Accessories that check who made them
Authentication chips in cartridges, batteries and accessories exist to make a third-party part fail rather than to make the product work better.
longGlue instead of screws
Adhesive assembly and proprietary fasteners raise the cost of opening a device far above the cost of the part inside it.
shortA genuine part that still refuses
Serialised parts mean a replacement can be identical and still be rejected, which is the practice several repair statutes now name directly.
medium