I can't authorize and problems login in

Hello!

As long as I use digital editions, I've had the problem that I have to log in and log off from my E-reader, to get the e-books on it. The consequense of this is that I have to authorize my E-reader everytime. Digital editions is now indicating that I have to many authorized devices, which makes me unable to download books.

Could someone help me fix this problem?

Jonne.