Softkey

"A nano-code for a specific lock. Your soft key “ring” (a list of soft keys currently stored by your software) can be viewed in your Datavault. Once a soft key is in your possession, you can open its associated lock at will. Since they are data, soft keys take up no physical inventory space."

- description of Soft key

Softkeys are collected by the player and stored in their datavault to open specific locks in Deus Ex: Invisible War. The softkey "ring" (a list of softkeys currently stored in the player's software) is the successor to the keyring from Deus Ex.