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"Billing Information
If this is a free trial, why do you need my credit card? In order to provide you with uninterrupted service, you will be billed automatically at the end of your trial period. There’s no obligation. To avoid being charged a monthly fee, simply cancel before the free trial ends. You can cancel anytime by contacting Customer Support."
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I think you will find this a fairly common procedure on free trials; certainly is with similar offers on magazines.