Error ! Check activation

I am trying to erase authorization on ADE so that I can re-authorize my PC.  Can anyone help me with this?  Has anyone else had a similar problem?

It worked for me, thanks!

I was able to delete in regedit screen but wont let me authorize.  same error message

Hello!

This means that your new e-book is DRM protected. You probably need to authorize the device you want to view the book on. To do that, you need an Adobe ID. Since you are posting in these forums, you already have Adobe ID.

1. Start Adobe Digital Editions.

2. Press Ctrl+Shift+U.

3. Follow onscreen instructions.

I am assuming you are a Windows user. Is that correct? For a Mac, the keyboard shortcut should be Cmd+Shift+U. You can of course also go to the program menu Help, and then "Authorize Comptuer".

Have you been reading the book on any other device yet? There are different "eBook vendors". If you got your book from Google, then I suggest you use your Google account to authorize your computer via Adobe Digital Editions, and not your Adobe ID.