the password idea is the best idea, the thumbprint idea is also a good idea, but that should be an option, if you buy a new car you have the choice of options just like the tone decode board does not come in all radios it should be the same. But my main reason for this post is that believe it or not motorola higher end portables have that option. saber 2's in the programming parameters you can enter a 4 digit passcode, but there is a way to bypass, but i wont let the cat out the bag.