Extensive forensic research has shown no evidence of unauthorized access or compromise to personal or financial information for PayPal customers.
PayPal customer and financial data is encrypted and stored separately, and PayPal never shares financial information with merchants, including eBay.
In addition to asking users to reset passwords, eBay Inc. said it will also encourage any eBay user who used the same password on other sites to change those, too.
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source: www.techworm.net