Android E-book Decryption

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http://www.mobileread.com – Hi, I've been gifted an android device (v2.2), which also comes with some books/audio/video content. The e-books have .epb extension, and when I rename them to .zip, they open in winrar with the error "unexpected end of archive". The list of files within the zip is shown by winrar/7-zip. But, none of the files extract, as they fail CRC check. When these books are opened on the android device, it momentarily shows a message "Unlocking FILENAME" etc. I think some sort of encryption(?) has been applied. How do I decode these books ? Plz let me know. I wa (HowTos)