In the wake of a spate of data breaches highlighting the vulnerability of companies that hold consumer information, class="mandelbrot_refrag"> MasterCard Inc announced last week it would apply the same rules to PIN-based debit card transactions as those used for credit cards: zero liability when fraud is reported. "Fraud and identity theft have been in the news a lot lately. We want to give cardholders peace of mind," says MasterCard spokeswoman Beth Kitchener. The breach at Target last year, which affected more than 40 million customers, is still a top concern for many. For consumers who have MasterCard-branded debit cards, the extension of zero liability means some things will change, while others won't. Here is what you need to know about the new policy, which takes effect on Oct. 1. Q: Does this mean that using a debit card is just as safe for transactions as using a credit card? A: Not exactly. While those who have MasterCard-branded debit cards