Why does iTunes require entering a password for downloads of free apps?

"I you don't have to enter a CC number on your iTunes account. And yes, you can change the account associated with iTunes on the device.

If you want, you could always get a small Visa gift card and enter that on the account. Once the card is out of money/expires, you can continue to download free apps but it won't let you charge anything to it.

Perhaps you can check with your bank or card issuer to see if they can block purchases from iTunes. Only do this after the iTunes account has been created and the card linked to the account."