transfer ebook from Adobe Digital Edition to Kobo Aura One

hello, I'm having trouble copying my ebooks from my PC to Kobo Aura One.

they are protected (Adobe Digital Editions). I've followed the instructions and open the ADE library, dragged the foles there and connected then the Kobo. but when I'm trying to drag the ebook in the Kobo, the message I get is "name of the book CE_COPY_NOT_ALLOWED".

I've an Adobe ID, but I'm not able to transfer anything.

is someone able to help me?

THANKS a lot in advance.