Are you getting a content locked message? Usually that means that you have two different ADE accounts on the go. A good rule of thumb to help prevent this is to use the same user information (email address, username if they want one and password) on all of your ePUB purchasing sites) and on your ADE account. Some sites (and Sony is one) creates an ADE account for you using the email address and password you have associated with your account. The ADE information must match on all the books you buy.
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