Right click on the book and select Item Info to verify the book has copy permission. These permission are set at the server level by the distributor.
The response did not solve my problem whatsoever. I can select an EPUB book from the library it goes into Digital Editions and every selection that I've make tells me it can't be copied. There must be some setting that I'm missing but this has never happened before. I had to reload Adobe since my laptop had issues. I've been using Adobe and my Kobo for 3 years now without an issue. I even tried downloading the free books that Adobe offers and got the same response.
It would actually be nice to speak to someone over the phone instead of having to communicate via this forum. It's very frustrating. PLEASE HELP to resolve this issue.