Dongle-based license management or DRM isn't the same as product tying; each dongle just validates the license for the use of a piece of software. But forcing c

Dongle-based license management or DRM isn't the same as product tying; each dongle just validates the license for the use of a piece of software. But forcing customers to only use ink cartridges from a specific brand, deliberately rejecting or invalidating third-party refill options? That is a form of product tying, and it is being deemed illegal in more and more countries.