Problem: E_ACT_TOO_MANY_ACTIVATIONS

I have an ebook Kobo. I buy my books in Google Play. I use the program Adobe Digital Editions to spend these books to my reader. Occasionally, I format and turn it to spending my library to my reader. In today, I have returned to format the reader, but Digital Adobe Editions says to me that the limit of activations has excelled itself and does not allow me to authorize again my ebook. My mistake is not to have removed the authorization in every formatting and now I cannot have my library of books in my ebook. Can I restore my inventory of activations?

Sorry for my English, I'm from Spain.