Dots per inch (DPI)

Used to measure the resolution of an image both on screen and in print. DPI measures how many dots fit into a linear inch, therefore the higher the DPI, the more detail can be shown in an image.

Digital tax stamp

Commonly refers to a tax stamp which carries a digitally generated and printed unique identifier.

Direct marking

A method of applying codes or information directly onto the product, without the use of a tax stamp or other label.

Distributed ledger

A series of replicated, shared, and interconnected digital data spread across multiple sites, countries, or institutions, with no central hub. Generally associated with blockchain systems.


The unauthorised transfer of goods from one jurisdiction to another to bypass taxation or regulatory requirements.