New PC causing problem w/kindle app

I restored all data from my backup drive onto a new Mac PC.

Previously, I had no problems moving Kindle books into Calibre. When I first went to the Kindle App on the new PC, it forced me to register again. They think it is a new device. When I move items into Calibre, I get the message that it is the incorrect PID. I have no idea what that is about.

Now all items are coming down as DRM books, where that was not the case on my former PC. I am really puzzled by all this. Any clues?

Thanks.