You're right, you didn't steal my bank password, you can use that to commit fraud, deceiving the bank systems to then enable stealing. Some might says you did

You're right, you didn't steal my bank password, you can use that to commit fraud, deceiving the bank systems to then enable stealing. Some might says you did steal the password, because you made it unusable for me, but that's a pretty subtle position I'm content with either side of. Perhaps you'd understand better if you consider a physical key - if you take it then I cannot open the lock (with that key at least). If you only copy it, I can still open the lock, so you didn't steal it from me; but the possibility of use allowed you to deny me the use of whatever the lock protects. Not so with most copyright works. If you copy my music I can still listen to my copy as often a I like. Maybe you understand the distinction now?