Please note that protected .vob files cannot be converted using RealPlayer Converter due to a restriction having to do with DRM (digital rights management) and copyright. Most commercially produced DVDs are copyright protected.
RealPlayer Converter is designed to convert VOB files from home videos that have one audio track. Converting from VOB files with multiple audio tracks may have unexpected results. If you are trying to convert .vob files from a DVD that you have created yourself (or a friend has created for you), please follow again the steps of the below article for help: