Once you get this message you need to delete all library books both EPUB and PDF from your ereader and your computer hard-drive. Then redownload only one file type from your library such as EPUB only. Then retransfer to your 600. If the problem is really the EPUB & PDF library combo problem, then those steps should make the protected message go away. It is an important step that you need to redownload from the library website. Hope that helps.
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