Why can't I open watermarkt EPUB in Aldiko e-bookreader. I'm only prompted to log in to my Adobe account. As I do so I get a message that my unit is autorized and another prompt to log in. I can't open my watermarkt e-pub book even then. Do I have to crate a new account for each unit I use? Do I have to download a special Digital Edition for Android? If so, where can I find a free download?