I downloaded an ebook text book without authorizing my computer. I then attempted to open the ebook on my iPad and signed into my adobe account, but the book wouldn't open saying it was in use by another user. I tried to authorize my computer with my adobe login ID, and when I did, the ebook file said that it could not be opened because it was in use with another user even though when I initially downloaded it, I didn't login with my ID.
If open a eBook with Digital Edition without a authiorze its linked with this device. You can not read it again when authiorze and reauthore or change the device. It is therefore necessary to authorize Digital Edition before you open anything and bought.