What is "unforgeable"

Usage examples of "unforgeable".

The closest thing might be a thin case of translux out of whose poison-guarded interior would come thinner sheets of ridulian crystal with very large numbers inscribed on them by unforgeable dataprint.

The latter was supposedly unforgeable, for the finan­cial institutions of all Thranx worlds were extremely security conscious.

He held up the compact computer unit which registered and transferred credit in unforgeable fashion, and tossed it disgustedly onto a nearby table.

The latter was supposedly unforgeable, for the finan­cial institutions of all Thranx worlds were extremely security‑conscious.