The VitalSource Bookshelf application lets you perform a number of advanced functions with your VBK e-books. Since the VBK format is a proprietary format, there is no conversion program that can convert a VBK file into a PDF file. Since you can print VBK files, you can convert a VBK into a PDF by using a print-to-PDF program that allows you to convert to PDF directly from the print menu.
Open a Web browser and go to a website that offers a print-to-PDF application for download. PrimoPDF.com, doPDF.com and CutePDF.com are a few of the websites that offer such an application for download. Download the print-to-PDF application onto the computer, double-click the installation file and follow the on-screen instructions to install the application onto the computer.
Double-click the "VitalSource Bookshelf" application icon to launch the application. Click the "Downloads" heading and select the VBK book that you want to convert into a PDF.
Click the "File" menu and select the "Print" option. Click the arrow to the right of the "Printer" heading a select the print-to-PDF application.
Click the "Print" button to convert the VBK file into a PDF. By default, the PDF file will be saved to the computer's desktop.