VENDING KEYS

Vending keys are classified into several vending key types as defined in IEC62055-41:

VD​DK (VendingDefaultDESKey)
The VDDK is a key used to define default decoder keys and may not be used to define any other decoder key types. For further information on this key type, see IEC62055-41.

VUDK (VendingUniqueDESKey)
The VUDK is a key used to define unique decoder keys and may not be used to define any other decoder key types. For further information on this key type, see IEC62055-41.

VCDK (VendingCommonDESKey)
The VUDK is a key used to define unique decoder keys and may not be used to define any other decoder key types. For further information on this key type, see IEC62055-41.

References: IEC62055-41