Why don't I enter my address with credit card purchases

This came in via email and I thought others might find the answer useful

When using my credit card on Hooktheory, I only had to enter the number, the expiration date, and ccv number. Normally I need to enter my address. Is this safe ?

Your credit card information is definitely safe. We use a payment processor called Stripe. They are now an industry leader for mobile and online payments working with companies such Kickstarter, Uber, Lyft, etc.