Via https://www.bitaddress.org I saw you can get a paper wall but with encryption and a passphrase. What are the steps of using the wallet with the passphrase? It seems the address is on the left while the private key is on the right. So I am guessing the private key is what's encrypted with the passphrase? How would you decrypt it with the passphrase?
When the time has come to spent your coins, whatever wallet software you use to scan the private QR code, will have to ask you for the passphrase.
Give it a try with one and any wallet app on your smartphone. You don't need to put any bitcoins on it.