When you sell your ebooks through online retailers such as Amazon, Barns & Noble, or Apple iBooks, a percentage of what you make goes to pay for the Digital Rights Management (DRM) and tech support they provide.
Enhanced PDF eBooks and How to Use Them
The term PDF stands for Portable Document Format. It is a file format that captures all the elements of a digital document so that you can view it, navigate it, print it, and easily share it online. Many software programs allow you to convert files into PDFs, such as Microsoft Word, Adobe Acrobat, Apple Text Edit, and many others.
A book that has been beautifully designed for print can be saved as a PDF, and the PDF will—if created correctly—preserve all the book’s features exactly as they are. In many ways, such PDFs are a type of eBook, and the most economical type to create, provided the print book already exists.