How can I transfer my eBooks from one Adobe Digital Edition 4.5.11 on one PC to another?

So I have the eBook that I purchased recently, the online bookstore gave me a one time access to download the book into Adobe Digital Editions 4.5.11. The book is encrypted and unshareable; you can't copy it or even send the file to your email and download it on the other end. It is simply impossible, but I have a new computer now, which is much lighter to carry around, and I want to move my Book into the new device with the same login ID. But so far, I am unable to do so.