ADE or the Sony Library software need to be used to load the book onto your reader. You can't simply copy the book itself onto the reader without going through one of those two programs because they need to be authenticated. However, I'm a little confused as to how you managed to download the books directly to your reader anyway. When I buy a DRM protected book or download one from the library, I don't get the actual book downloaded when I click "download." I get a file which can only be opened in either ADE or the Sony Reader Library software. In any event, you may have better luck getting your question answered in the Sony forum since there are many PRS 505 owners there.
Eric
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