A "paperback copy" refers to a book that is bound with a flexible cover made of paper. It is usually less expensive and easier to carry around compared to a hardcover book. Full definition
There would be a tour - wide giveaway for two signed paperback copies with special bookmarks, one eBook and ten promotional bookmarks. (enchantedbookpromotions.com)
It gives us the tools to create and sell digital books; print and sell paperback copies on demand; add author pages and even market books. (marketingforwriters.com)