Reversing an authorization made without adobe id

I recently purchased an ebook via Google Playstore and downloaded it in the .ascm format on my PC at home. I also installed the Adobe Digital Edition along with it. In a fit of hastiness, I authorized the book without specifying an adobe id/password. The product did warn me that doing so will lock the book to that one PC and that I wouldn't be able to view it anywhere else.

Is there a way to reverse this? How can I re-authorize my book with a proper adobe id/password (that I just created) so that I will be able to download the .ascm on *any* PC and be able to open it via Adobe Digital Edition?