Flipbooks (E-books) created with an unregistered program will have a watermark, and you can only import the first 12 pages of PDF files. To remove the FlipBuilder watermark and import PDF files with more than 12 pages, you must purchase the program to get a license code for program registration. Choose the program that best suits your work and requirements:https://www.flipbuilder.com/purchase.html
Note: The license code is valid for life-time and you can create unlimited number of books as you want and upload them to your server totally free.