This is really annoying-says my kobo is not authorized to open this book. I have ADE 4.5.6177148 and my kobo is an Aura HD 4.6.995. I have de-authorized both, re-authorized both, removed ADE and re-installed. Same thing every time and this just started about 4 days ago. I can read the book on my computer in ADE but not on my Kobo. It sucks that Adobe won't help in any situation, yet they want you to buy there products.