Some contracts are unenforceable because they are unreasonable–it’s possible that some of those wacky “agreements” that come with downloads fall under that heading; besides, I wonder whether clicking on a button equates to signing a contract. For one thing, ANYONE could have clicked that button. In most states, contracts with minors are unenforceable. Who’s to say who was using your computer at the moment the download happened? A “contract” with no actual human signature is highly suspect.

However, something you do sign (assuming you’re of age) is indeed enforceable. Just watch anything that says the signer (i.e., you) will pay. Pay what? Under what circumstances? And for sure, never agree to sign anything that says “pay for our lawyers’ fees.”