[pessimizer]

To me, that's like saying, "You can have a glass of water, but you can't have my car" is a contract.

"Give me a dollar and you can have this glass of water" is a contract.

edit: and to be a tiny bit less glib, a license is where I give up rights I already have, under particular conditions that I dictate. If you choose not to abide by those conditions, the only thing that happens is that I regain the ability to use the rights that I already have. I don't gain any super-copyright powers, or a more powerful copyright.

[randomNumber7]

I know a farmer in a small village and they sell milk and cheese etc. There is no cashier, you take what you want and let the money there. It would still be breaking a contract if you dont...

[em-bee]

because you trade something for something else.

defining what the trade is when i download a GPL application is a bit trickier.