Installed without a key!

Hi,

I recently installed NAV 2012 on a 2nd computer by logging in to my account and clicking the Download button next to NAV. My account showed no available installs, so I was expecting it to require me to purchase a 2nd key in order to activate the installation on the new computer. But it successfully completed the installation and activation without requiring me to enter a new product key. Is the purchasing of the extra keys supposed to be on the honor system, or something?

Thanks