What are the so-called safety features on packaging materials?

The safety features consist of two elements placed on the packaging of a medicinal product:

1. a unique identifier, a unique sequence carried by a two-dimensional barcode allowing the identification and authentication of the individual pack on which it is printed; and
2. a device allowing the verification of whether the packaging of the medicinal product has been tampered with (anti-tampering device).

[GMP Compliance Adviser, Chapter C.8.2.1]