I had a lot of trouble with adobe digital editions when I bought Jacobs Ladder. I think I didn't know I had to register it under a name, and since I didn't, I could only print the PDF from the one computer?? Took a few emails to sort out. Ended up buying the later books in paperback from book depository and was even cheaper than what I had paid for the PDFs!!
But yes, it is possible to print them.