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https://developer.apple.com/library/ios/documentation/IDEs/Conceptual/AppDistributionGuide/MaintainingCertificates/MaintainingCertificates.html#//apple_ref/doc/uid/TP40012582-CH31-SW1 App distribution guide
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原文地址：http://www.cnblogs.com/shycie/p/5500266.html
