I got E_LIC_LICENSE_SIGN_ERROR after correctly authorizing Adobe ID

Hello, I'm having the same exact problem I tried different things, such as uninstall, unauthorise the computer and reauthorise it, I also checked the default thing. I even created a new account and tried on a different computer. Did anyone find any other option to fix this problem???

I've got exactly the same problem, after years of problem-free downloading. I've tried de-authorizing and re-authorizing ADE several times, and I've upgraded to the latest ADE. No changes, nothing works.

I've reported the problem to Google Play and Kobo. Because I've got a Kobo reader, I can still downloaded ebooks directly from Kobo, but nothing from my usual sources. I feel very angry with Adobe.

My app stopped working mid-November; I got an error message "Check Activation", so E-Books wouldn't download from BorrowBox.With Adobe Support I have found a solution - it's about having correctly recognised authorisation:

1. Uninstall the faulty ADE 4.5.11
2. From Adobe's website re-install ADE 4.5.11 (I use the Windows edition)
3. Open the ADE, go to Help, and select Erase Authorization. Follow the steps.

4 Go back to Help, select Authorize the Computer and follow the steps outlined (they are very clear - you need a user name (your own, [the administrator] email address, and to create a password).

1. Go to Help, and select Authorization Information. Your details (user name and Adobe vendor ID) should be clearly visible (and ticked as 'Default)
2. Close the ADE. Go to BorrowBox and test out a download. It should work, and then you can transfer the Ebook to Kobo.

Note: I tried this sequence several times before it magically worked - persist.

It took me over 12 hours of Live Chat with a number of Adobe consultant's before one  (Vishwarath) guided me through the above fix. Persist in requesting support, and don't ever be discouraged by any app provider using the excuse that "as it's free software we no longer support it" - that's not good enough. 

I hope sharing what's worked for me will be useful to the thousands of ADE 4.5.11 users whose app has suddenly stopped working.

I have shared this solution with Bolinda (the owner of BorrowBox). ADE 4.5.11 is a great app, and I happily use Adobe programs.

I welcome any feedback. Good luck,

Garry

You're welcome, yes, me too. I already deleted adept, deleted adobe digital editions, changed my password, adobe confirms my account and I can't add the acsm book I bought to my library...I'm using Windows 7...

I also have a Sony Reader and I'm getting the same error for the same book. I got it from Casa del Libro.

I hope we find a solution soon.

Un saludo.