Policy requires that we have your name, address, and date of birth on file before you can make large transactions with your Coinbase account.
For new customers, when you make a large transaction you will be prompted to complete your personal information before your trade is made.
If you're an existing Coinbase customer and you've made a large transaction in the past, you'll be prompted to enter your personal information the next time you make a transaction with your account.
If you don't want to provide your information and want to use a different provider, you can close your Coinbase account from your Security Settings page, which will let you transfer your funds to another account.