Look at this beautiful statue I've made! I have put it in a public area for everyone to enjoy. You may even take pictures, however you must pay me $5 for each picture you take. If your print out multiple copies of your picture, you must send a check to my address with the payment for each additional copy.

Picture of statue = copy of software

Public area = internet

$5 per print fee = software license fee

I am not even sure if I fully believe my own analogy, but I find it interesting to think about.